499 results about "Environmental water" patented technology

A hydraulic-permeation type environmental water-runoff filtration-system applicable to street curb-inlet type drainage-chambers, which generally cooperatively interconnect with street and parking-lot drains. The BLUEBAY-BMP™ pollution-trap provides advantage of community-tailored filtering stages, the preferred embodiment seting forth a convenient user-friendly prefabricated-kit assembly employing a basic build-in-place containment-housing which can be readily adapted to the studied needs of a given community,—without incuring alteration of existing sewer-stormdrains. The uniquely adaptative capability of the containment-housing enables selectively structuring multi-stages of filtration, which progressions address a variety of ecosystem-contaminants, ranging from basic street-refuse and floatable objects, to coarse sediment, finer silt, and comparatively minute albeit environmentally-hazardous petrochemicals, heavy-metals, phosphates, and nitrates;—all of which are readily retrieved from the apparatus confines via periodic maintenance for transfer to appropriate collection handling facilities.

The invention relates to a method of preparing three-dimensionally ordered macroporous chelate resin which has a hydrophilic-structure framework and can absorb precious metal irons in aqueous solution, belonging to the field of the chelate resin. The method of preparing the three-dimensionally ordered macroporous chelate resin comprises the following steps: (1) preparing 80-1000nm silica colloidal crystal template; (2) preparing three-dimensionally ordered Poly(N-vinylformamide) or poly(n-vinylacetamide) macroporous material; and (3) preparing hydrophilic three-dimensionally ordered macroporous chelate resin. Compared with the traditional macroporous or gel-type polyvinylamine resin, the novel three-dimensionally ordered macroporous chelate resin prepared with the method has the advantages that the regularly-arranged porous channel system has small diffusion resistance, which is good for the metal irons enter the absorption center from all directions. In addition, the novel three-dimensionally ordered macroporous chelate resin is easy to synthesize, has stable performance, good hydrophilic performance and high selectivity, contains many functional groups, can absorb a large number of metal irons and has better development and utilization values in the aspect of avoiding heavy metal pollution and protecting the environmental water.

The process and apparatus of this invention can be used to separate and recover particles from a liquid sample. The preferred embodiment of this invention is to separate and recover microorganisms, particularly Cryptosporidium oocysts, from a variety of environmental sources. The process consists of applying a municipal drinking water coagulation scheme to an environmental water sample, and the aforementioned water sample is then filtered through an apparatus containing a granular filter material. The analyte is then recovered by agitating the filter vigorously (with a dispersing agent inside) and removing the eluent from the filtration apparatus. The eluent can then by aliquotted and assayed by any means available. The floc resulting from the coagulant addition can typically be dissolved at low pH. The filter apparatus is simply a container that allows the passage of water through a granular material while retaining the granular material via a mesh, screen, or similar material.

The invention discloses a mercury ion detection reagent and a detection method. The reagent comprises nano sol, nucleic acid adaptors marked by Raman active molecules and a charge modifier. The detection method comprises the following steps of: firstly, synthesizing the nano sol, then adding a proper quantity of adaptors to a proper quantity of fresh nano sol and uniformly mixing; continuing to add a proper quantity of charge modifier and uniformly mixing; then adding a sample to be tested and incubating for 1-5 minutes; and finally, taking the nano sol to test a Roman scattering spectral signal and carrying out data processing. In the invention, based on the addition of Hg<2+>, the structures of the nano particle surface nucleic acid adaptors are changed, i.e. nano particle aggregation in the silver sol and surface enhanced Roman scattering signals of signal molecules are enhanced. In the invention, the SERS (Surface Enhanced Raman Scattering) technology is adopted, the detection limit to the Hg<2+> is at the nmol / L level, thus the invention has the advantages of high detection speed of the linear response range of Hg<2+> concentration and high selectivity and is suitable for the quick detection of trace Hg<2+> in environmental water.

This invention relates to a long-distance monitoring and alarming system of the environmental water quality. It is mainly composed of the sensing detection assembly, the data collecting / processing device, the wireless network communication module assembly and the center station of environmental water quality monitoring. The sensing detection assembly is made up of varies water quality indicating detectors and the corresponding sensor feeler. The data collecting / processing device has the functions of collecting and processing the simulate signals of immediately detected various water quality indexes, and transforming them into digital signals. The monitoring center station has the functions of immediate storing and analysis processing, sending out indicating alarm in time when the condition of above-norm., and in virtue of public radio communication network, carrying out mutual data transmitting.

A fast detection method of water microbe includes filtering water sample by microhole filtering film with different hole diameter, carrying out ATP luminous detection for used filtering film and for ATP standard solution and new microhole filtering film, calculating linear regression equation of Lg [ATP] = A+ BLg [CPM] based on logarithmic relation of ATP concentration to its luminous pulse counts and calculating out microbe content in water as well as ATP concentration in sample according CPM value of filtering film.

An environmental water resource recycling system of the invention comprises pluralities of drainpipes units, which includes pluralities of drainpipes engaged in pluralities of holder holes formed by coupled frame strips, and sealing lids covering the opening at one end of the drainpipes. An instant water-absorbing sand layer is applied on the soil layer exposed on the ground surface before inserting the lower end of the drainpipes held in the drainpipe unit into the sand layer. Concrete is poured onto the ground to be constructed such that the concrete can integrally cover the drainpipe units. The sealing lids can be removed from the openings on the upper end of the drainpipes after the concrete is solidified, thereby accomplishing a permeable paving and instantly draining the rain on the permeable paving to the sand layer and further to the underground for being recycled as water resource for further utilization.

The invention belongs to the technical field of detection of enrichment of remained antibiotics in a water body environment, and particularly relates to a synchronous detection method of tetracyclines, fluoroquinolones and sulfonamide antibiotics remained in the water body. The detection method comprises the following steps: (1) performing water sample pretreatment; (2) performing small-column enrichment of target antibiotics by using solid-phase extraction; (3) detecting on a machine by using high performance liquid chromatography and tandem mass spectrum. According to the method, once the sample feeding is carried out at one time, multiple antibiotics in the water body can be detected at the same time, the time consumption of a detection process is reduced, the detection accuracy and sensitivity are increased, the detection limit is low, and the condition of the trace amount of remained antibiotics in the water body environment can be detected; meanwhile, the detection method is convenient to operate and low in environment toxicity and is low in using amount of organic reagents.

The invention relates to the technical field of magnetic metal organic framework materials, in particular to a preparation method and application of Fe3O4 / MIL-101(Cr). The method includes the steps of preparing MIL-101(Cr) material through a hydrothermal method to serve as a template, and generating Fe3O4 particles in situ in holes of MIL-101(Cr) through a reduction co-precipitation method under the ultrasonic conduction and in a nitrogen protection state. The Fe3O4 / MIL-101(Cr) composite obtained through the method is strong in magnetism, large in surface area, shortened in synthesis time, controllable in synthesis condition, novel in synthesis method, simple and easy to repeat, stable and controllable in prepared material quality, and capable of being synthesized in batches. The Fe3O4 / MIL-101(Cr) composite is good in effect and can be repeatedly used six times or more when used for adsorbing and removing acid dyes in environmental water.

The invention discloses a long-acting protective liquid self-secreting super-lubricity coating and a preparation method thereof, and belongs to the anti-corrosion, anti-fouling and anti-icing fields and the like. A coating body is an elastic porous film layer and is divided into a bottom layer, an upper layer and a surface layer. The bottom layer is of a large pore structure, the porosity is as high as 60%-95%, the pore diameter ranges from 100 microns to 2000 microns, and the oil storage amount is increased; the upper layer pore diameter ranges from 10 nm to 100 microns, the thickness rangesfrom 50 microns to 1000 microns, oil is prevented from being lost too fast, and the secretion process is controlled; and the surface layer is of a micro-nano-level convex structure, the roughness ranges from 10 nm to 50 microns, and the lyophobic and oil storage effects are achieved. Lubricating oil is stored in the porous structure, when surface oil dries, the oil can be gradually diffused to thesurface layer through upper-layer small holes to form a liquid protective oil film. Corrosion inhibitors, bactericides and the like added into the lubricating oil are released along with the oil, andthe protective function of the coating is enhanced. When environmental water flow impact, external force extrusion, friction and the like lead to losing of the surface oil film, the external force effect will also promote deformation of the elastic porous structure to secrete oil, it keeps that a stable oil layer is formed on the surface, and the service life of the coating is significantly prolonged.

A preparation method of polyvinyl alcohol / hydroxyapatite (PVA / HA) composite microspheres belongs to preparation methods of composite water-in-oil emulsion system microspheres. PVA and HA precursors are used as raw materials to prepare a clear and transparent mixed solution; the clear and transparent mixed solution is dispersed into an oil phase containing a surfactant to form a homogeneous water-in-oil microemulsion; and the PVA / HA composite microspheres can be finally obtained by successive crosslinking reaction under acid-catalyzed conditions, HA deposition under alkaline conditions, product centrifugation, washing, drying and other processes. The method has the advantages of simple process, good repeatability, low energy consumption and low cost, and effectively solves the problems that inorganic nanoparticles are easy to agglomerate in the microspheres to cause uneven structures and poor comprehensive performances and the like. The composite microspheres prepared by the method have the advantages of regular morphology, high dispersibility, uniform microstructure, good biocompatibility, biological activity and adsorption performance, and can be used as drug carrier materials, bone repair materials, environmental water treatment materials, cosmetics or food additives and the like.

The invention provides a microecological bactericide for sustained release in water. The microecological bactericide is a bacillus subtilis microcapsule product and is mainly applied to aquaculture and environmental water purification. 2.0% of bacillus subtilis spores are taken as core materials, 0.8% of gelatin and 1.5% of sodium alginate are taken as composite wall materials, and 10% of calcium chloride is taken as a curing agent to prepare the microcapsule by adopting a piercing-solidifying method, wherein the encapsulated efficiency is above 87%, and the diameter of the microcapsule is 3-5mm. The product provided by the invention is applied to aquaculture, can play roles of purifying water and inhibiting pathogenic bacteria, and has a service cycle being more than 60 days.

The invention provides a magnetic nano material solid phase extracting agent used for absorbing phthalate organic pollutants in an environmental water sample and a preparation method of the extracting agent. The magnetic nano material solid phase extracting agent comprises magnetic silicon dioxide particles serving as the inner core and layered bi-metal hydroxide serving as the shell layer, wherein the magnetic silicon dioxide particles are formed by coating a magnetic nano core with silicon dioxide; and the layered bi-metal hydroxide shell layer adopts Mg-Al bi-metal hydroxide. The preparation method for the solid phase extraction absorbent is simple, the raw material cost is low, a designed extraction process is fast and convenient, a small quantity of organic solvent is required to be used in the whole process, and environment friendliness is achieved.

The invention relates to a mine water glass reinforced water shutoff material which is composed of two independent components, namely component A and component B, wherein the component A comprises following raw materials by weight: 51-99.9% of water glass A, 0-50% of water glass B, 0.1-2% of catalyst C and 0-50% of plasticizer D; and the component B comprises the following raw materials by weight: 51-100% of curing agent A, 0-50% of curing agent B and 0-50% of polyether polyol C. The mine water glass reinforced water shutoff material has the effects of high flame resistance, low reaction heat and adjustable curing time; and environmental water basically does not influence the reaction. By utilizing the mine water glass reinforced water shutoff material, the safety of production of a coal mine can be improved to a great extent.

The invention discloses a chitosan-grafted beta-cyclodextrin bonded silica gel absorbent as well as a preparation method and application of the chitosan-grafted beta-cyclodextrin bonded silica gel absorbent, and belongs to the technical field of the absorbent material preparation. The preparation method of the chitosan-grafted beta-cyclodextrin bonded silica gel absorbent comprises the steps of (1) activating silica gel, (2) bonding the silica gel with gamma-aminopropyl, (3) carrying out silica gel formyl group modification reaction, and (4) bonding chitosan with glutaraldehyde and grafting beta-cyclodextrin with the chitosan. According to the chitosan-grafted beta-cyclodextrin bonded silica gel absorbent provided by the invention, the activated silica gel surface is chemically modified by gamma aminopropyl triethoxy silane, and then, cyclodextrin-grafted chitosan is taken as a functional monomer to compound a solid-phase extraction material. By combining cyclodextrin recognition performance and a chitosan absorbing function, the chitosan-grafted beta-cyclodextrin bonded silica gel absorbent has the advantages of firmness in bonding, stable property, favorable reproducibility and selection, and large enrichment multiple, and the chitosan-grafted beta-cyclodextrin bonded silica gel absorbent can be used in a wide pH scope. The absorbent can be used in the enrichment pretreatment of trace Cu (I) and Cd (II) in an environmental water sample.

The invention discloses a fluorescent magnetic nanoparticle for hypochlorous acid detection and a synthetic method thereof. The synthetic method comprises the following steps: preparing a ferroferric oxide magnetic nanoparticle as a magnetic core material by adopting a solvent thermal method, coating the outer part of the magnetic core with a layer of nonporous silicon dioxide and a layer of mesoporous silicon dioxide in sequence by adopting a sol-gel method, and finally covalently modifying a magnetic mesoporous material obtained in the previous two steps with an organic fluorescent molecule capable of specifically identifying hypochlorous acid through a silane coupling agent, thus obtaining the fluorescent magnetic nanoparticle for the hypochlorous acid detection. The nanoparticle is simple in a preparation process and low in cost; the detection of high sensitivity and high selectivity of the hypochlorous acid can be realized by utilizing the remarkable enhancement of a fluorescent signal of the nanoparticle before and after recognition; and the magnetic control and separation of the magnetic nanoparticle can be realized by additionally arranging a magnetic field. The fluorescent magnetic nanoparticle and the synthetic method thereof have an important application prospect in the fields of visual tracing and imaging of the hypochlorous acid in living organisms, quantitative detection of hypochlorous acid in environmental water, clearing and the like.

The invention specifically relates to a method for detecting acute biological toxicity of sewage, belonging to the field of environmental water detection. A method for accurately detecting the acute biological toxicity of a sewage sample can be established by the following steps of: extracting and concentrating organic matter in a sewage sample, removing the interference of inorganic matter, and finally detecting by using fresh water luminous bacteria Qinghai vibrio Q67. The method can provide accurate final results, is stable and has good reproducibility. The method is the effective improvement of the traditional method.

The boat engine cooling system provides cooling of the engine of a boat or other nautical vehicle through both chemical coolant, such as an antifreeze solution, and environmental water; i.e., the water the vehicle is passing through. In use, heated engine coolant is expelled by the engine and passes through a coolant inlet port formed through a hollow tank, where it is transported through a coolant pipe to the engine. Further, water from the environment (i.e., the lake, ocean or other body of water the vehicle is passing through) is injected into a cooling reservoir in the hollow tank through a water inlet port. The engine coolant passing through a central portion of the coolant pipe is cooled by the water in the cooling reservoir prior to circulating back through the engine.

The invention discloses a phased array spark subsource for seismic exploration, which has a main structure as follows: a metal shell of which the lower end is a cone is provided, and the shell is internally provided with a high-voltage electrode connected with a coaxial cable of a high-voltage power supply; a low-voltage electrode corresponds to the high-voltage electrode and is fixed on the cone; and the opposite electrode ends of the high-voltage electrode and the low-voltage electrode are respectively designed into mutually parallel band electrodes between which electrolyte is arranged. The subsource provided by the invention has a small quantity of water so as not to depend on environmental water. The spark subsource provided by the invention consists of a plurality of subsources distributed in an array way in practical application, the high-voltage electrode and the low-voltage electrode are both arranged in the shell of the spark subsource, and a discharge-in-liquid chamber is formed by a sealed space. The high-voltage electrode and the low-voltage electrode are designed into a parabola shape, and the discharge center is located at the focus of the parabola, thus, most of the generated energy can be propagated to the underground.

The invention provides a detection method of residual quantities of various veterinary drugs in a culturing or a slaughtering environment. With the method, rapid screening and quantitative detection can be carried out upon 61 drugs of 9 categories. The drugs include chlormycetin, beta lactams (penicillins), quinolones, sulfonamides, trimethoprims, macrolides, tetracyclines, and nitroimidazoles. According to the invention, a soil sample or an environmental water sample is added into a phosphate buffering solution; a filtrate obtained through centrifugation is extracted in a solid phase extraction column, and is eluted; the extraction column is dried by blowing, and is washed by using a methanol solution; an obtained eluent is titrated by using a methanol solution; a chromatogram peak of the sample is detected by using liquid chromatography-tandem mass spectrometry; the chromatogram peak is compared with a standard chromatogram peak, such that a specific variety of the detected drug is accurately determined. According to the invention, the sample solution is subject to liquid chromatography-tandem mass spectrometry multi-reaction monitoring selected ion analysis. Through internal standard correction, the recovering rate is 70-120%, and a relative standard deviation RSD is no larger than 18%. Compared with existing technologies, the analysis efficiency is improved by at least 5 times, and the detection cost is 30% of that of existing technologies.

The present invention's new calculative methodology models the motion of a seagoing vessel in six dimensions, uniquely employing a total velocity potential as the sole parameterization for taking into consideration all linear and nonlinear dynamical effects involved in interaction between the vessel and environmental water. The solid-body rotational motion of the vessel about the vessel's center of mass is determined in three dimensions (roll, pitch, yaw) by calculating the pressure torque and the buoyancy torque. The solid-body translational motion of the vessel's center of mass is determined in three dimensions (heave, surge, sway) by calculating the pressure force and the buoyancy force. The pressure torque and the pressure force are each associated with pressure (e.g., non-hydrostatic pressure) of water on the vessel's surface. The buoyancy torque and the buoyancy force are each associated with the displacement of the vessel with respect to the vessel's equilibrium position in the water.

The invention discloses an air conditioner with air purifying and humidifying functions. The air conditioner comprises an air outlet, an air inlet, an air conditioner blower and a condenser, wherein acondensed water accumulating box is arranged in the air conditioner, and the top part of the condensed water accumulating box communicates with the condenser through a water guide pipe; an ultrasonicatomizer module is arranged in the condensed water accumulating box; an ultrasonic atomizer humidifying water mist air outlet is formed in the condensed water accumulating box and is positioned at the air inlet; the condensed is collected and recycled through an ultrasonic humidifier module; the ultrasonic humidifier module is used for evaporating; water mist discharged by the humidifier module flows through an oxygen anion generator for ionizing to obtain ions which benefit a human body under the effect of positive and negative ion emitting electrodes. Therefore, indoor environmental water can be circulated and the air can be purified; the indoor air is kept fresh, and the humidity is constant; and the two purposes of humidifying and purifying the air are achieved.

The applicant provides a strain of Bacillus tequilensis ZSGD5, with accession number of the deposit of CCTCC NO.: M 2014004, deposited at the China Center for Type Culture Collection, Wuhan University, Wuhan City, China on Jan. 6, 2014. The applicant also provides a compound microecological Bacillus agent. The compound microbial agent comprises the following bacterial species: Bacillus tequilensis, Type I Bacillus subtilis, Type II Bacillus subtilis, Type I Bacillus licheniformis, Type II Bacillus licheniformis, Bacillus pumilus, and Bacillus megaterium. The Bacillus tequilensis provided in the present invention has an efficient water bottom cleaning capability, and can rapidly decompose and decrease the sludge at the bottom of a pond and effectively improve environmental waters for such phenomena as black water, and turbid water, so the Bacillus tequilensis can be used for water environment treatment in aquaculture and for urban wastewater treatment.

The invention relates to a metal ion imprinting solid phase extraction small column, which comprises the small column which takes a metal ion imprinting absorbent of 50-200mg as a filling matrix and has a polypropylene outer shell with the diameter of 6-10mm; and the preparation comprises the steps of dissolving metal ions, CTMAB and functional monomers in DDW, adding a mixed sol of alkoxy silane and methanol, further adding a catalyst, stirring, filtering and drying; then placing in a Soxhlet extractor, removing the CTMAB and the metal irons, washing and drying for preparation; and weighing the metal ion imprinting absorbent, filling in the solid phase extraction small column with the polypropylene outer shell and filling the column by homogenization under the vacuum-pumping state. The filler synthesis process of the solid-phase extraction small column is simple, the cost is low, the reaction conditions are mild, the prepared metal ion imprinting solid phase extraction small column can be applied in selective separation and enrichment of trace metal ions in environmental water samples, compared with the ordinary liquid-liquid extraction method, the operation is simple, rapid and highly efficient.

The invention provides an OLED (Organic Light-Emitting Diode) display panel, which comprises an array substrate, an OLED functional layer and a thin-film packaging layer, and is characterized in thatthe OLED display panel is internally provided with an opening area to be cut and removed, a blocking dam surrounding the opening area is arranged between the array substrate and the OLED functional layer at the periphery of the opening area, the blocking dam includes a blocking unit with the cross section being in the shape of an inverted trapezoid around the opening area, and the OLED functionallayer above the blocking dam is disconnected at two sides of the blocking dam during film forming as the cross section of the blocking unit is in the shape of an inverted trapezoid. According to the invention, the structure of the blocking dam at the periphery of the opening area is optimized, and the cross section of the blocking unit is enabled to be in the shape of an inverted trapezoid, so that the whole common film layer deposited by a common mask plate can be cut off at two sides of the blocking dam, thus environmental water and oxygen can be prevented from invading into a light-emittingpixel area of the panel from the cutting section of the opening area along the continuous common film layer after the opening area is cut, and the service life of the panel is prolonged.

The invention discloses an ionic liquid modified crosslinked porous chitosan adsorbent and a preparation method and application thereof and belongs to the field of preparation processes of adsorbent materials. The preparation method includes: 1), synthesis of crosslinked porous chitosan; 2), synthesis of the ionic liquid modified crosslinked porous chitosan adsorbent. The ionic liquid modified crosslinked porous chitosan adsorbent is characterized in that glutaraldehyde is taken as a crosslinking agent and the chitosan is taken as a carrier to prepare the crosslinked porous chitosan adsorbent, and 1-allyl-3-methimidazole chloride is grafted on the a crosslinked porous chitosan ball to prepare the ionic liquid modified crosslinked porous chitosan adsorbent material. Massive ionic liquid is led to the crosslinked porous chitosan, affinity on organ pollutants is increased, adsorption performance of the adsorbent is improved, firm linking and stable performance are achieved, and the adsorbent can be used in a wide range of pH values; the adsorbent is applicable to adsorption of dye of environmental water samples.

The invention discloses a preparation method and a Cu<2+> detection application of a rare earth ratiometric fluorescent probe, and belongs to the technical field of environmental detection. The preparation method of the luminol-Tb-GMP fluorescent probe is established through the self-polymerization coordination effect among luminol, GMP and Tb<3+> by using luminol and guanosine monophosphate (GMP)as dual ligands and using a rare earth ion Tb<3+> as a luminescent center ion. The luminol-Tb-GMP fluorescent probe combines the dual fluorescent signals of luminol and Tb<3+>, and simultaneously emits dual fluorescent signals of the luminol and Tb<3+> under the same excitation wavelength. When Cu<2+> exists, the luminol and GMP have a strong coordination effect on the Cu<2+> in order to preventelectrons from being transferred from the amino group of the GMP to Tb<3+>, so fluorescence quenching of the Tb<3+> is caused, and the fluorescence intensity of the luminol is unchanged, thereby a Cu<2+> detection method based on the fluorescence signal ratio of the luminol and Tb<3+> is established. Additionally, the green fluorescence of the Tb<3+> gradually weakens and the blue fluorescence ofthe luminol gradually appears with the increase of the Cu<2+> concentration, so the visual detection of the Cu<2+> can be achieved. The luminol-Tb-GMP fluorescent probe also can be applied to the sensitive detection of the Cu<2+> in an environmental water samples and a biological sample.

The invention discloses a method for preparing a water-soluble mercury ion fluorescence probe on the basis of rhodamine and application of the water-soluble mercury ion fluorescence probe. A structural formula of the Hg<2+> fluorescence probe are shown, and the water-soluble mercury ion fluorescence probe is synthesized from 1, 2, 4-trimellitic anhydride, 3-diethylamino phenol and hydrazine hydrate. The method and the application have the advantages that the water-soluble Hg<2+> fluorescence probe prepared by the aid of the method is simple in structure, is based on rhodamine derivatives and is the first fluorescence probe for detecting Hg<2+> in 100% aqueous solution by the aid of rhodamine lactam derivatives; ring opening of rhodamine lactam structures can be carried out under the induction effects of the Hg<2+> in systems, intense fluorescence can be generated, and the water-soluble mercury ion fluorescence probe is high in Hg<2+> detection sensitivity; the fluorescence probe is excellent in Hg<2+> selectivity and is almost free of interference of other positive ions; the Hg<2+> can be measured by the fluorescence probe without disturbance when pH (potential of hydrogen) values range from 5.0-8.0, the fluorescence probe and the Hg<2+> can act quickly, and the response time is shorter than 3 minutes; the probe further can be applied to measuring Hg<2+> in environmental water samples and carrying out fluorescence imaging on Hg<2+> in biological cells.