41 results about "Metal analysis" patented technology

Methods of analysis, and compositions relating to such, to determine the presence or absence of an analyte in a sample utilizing a composite substrate which facilitates surface enhanced Raman spectroscopy through the use of ‘hot spots’ of the form ‘metal / analyte / metal’ are presented. Additionally, substrates which contain ‘hot spots’ of the form ‘metal / analyte / metal’ and substrates which facilitate the formation of ‘hot spots’ of the form ‘metal / analyte / metal’ are presented as well as methods for making these substrates.

A system and method for detecting, measuring, and analyzing for metallic impurities in pharmaceutical drugs and compounds utilizes an x-ray fluorescence system. The system and method may be co-located with a pharmaceutical manufacturing process for in-line continuous monitoring of metal impurities. The pharmaceutical products may be in a form selected from a powder, slurry, pill, tablet, and gel.

The invention relates to a heavy metal analysis detection device, particularly relates to a portable trace heavy metal ion concentration detecting pen, and aims to solve the problem that an existing detecting device is not suitable for field quick detection due to large size, expensive instrument, high operation cost, complicated detection steps and carrying inconvenience. The detecting pen comprises a hollow penholder, wherein an electrode assembly, a spring, a button and a stripping voltammetry-based detection circuit are arranged in the hollow penholder from bottom to top sequentially; the spring sleeves the electrode body of the electrode assembly, and the lower end of the spring is clamped on an annular spring bulge on the inner wall of the hollow penholder; the button is formed by an annulus body and a stirring handle fixed on the outer ring of the annulus body; the annulus body of the button is fixed at the upper end of the electrode body of the electrode assembly in a sleeving manner; and the stirring handle of the button extends out of an L-shaped hole in the hollow penholder. The portable trace heavy metal ion concentration detecting pen is small and portable, is quick and safe to operate, has the advantage of short detection time, high accuracy and high integrality, and is especially applicable to field detection.

The present invention provides a pre-treatment apparatus for an analytical metal sample, the apparatus including (1) a treatment chamber having a sample charging port which can be opened and closed and provided at the top of the chamber, a sample discharging port which can be opened and closed and provided at the bottom of the chamber, and a gas inlet and gas outlet, (2) a sample carrying bar joined to a sample holder also used as a sputtering electrode, and provided to pass through at least one side wall of the treatment chamber so as to be substantially horizontally movable and axially rotatable, and (3) a sputtering counter electrode at least having portions arranged opposite to each other in a region not inhibiting the charge and discharge of an analytical metal sample so that the sample holder can be arranged in the counter electrode. The present invention also provides a pre-treatment method capable of simply cleaning the surface of the analytical metal sample by using the pre-treatment apparatus and preventing re-contamination of the cleaned sample by exposure to the air or the like. Furthermore, the present invention provides an analysis apparatus provided with the pre-treatment apparatus to permit high-accuracy quantitative determination of trace elements of metals.

The invention relates to a method for determination of lead and cadmium content in silver jewelry and belongs to the field of precious metal analysis. The method comprises dissolving a silver sample to be detected through nitric acid to obtain a silver nitrate solution, adding a thiocyanate solution into the silver nitrate solution so that the silver nitrate is completely precipitated to form silver rhodanide, filtering to remove silver rhodanide precipitates, collecting the filtrate and determining lead and cadmium contents. Potassium thiocyanate is used as a precipitating agent and can solve the problem that lead and cadmium contents cannot be accurately determined because of silver chloride precipitate adsorption effects on lead and cadmium. The method realizes accurate determination of two element contents of silver jewelry.

The invention discloses an online water heavy metal analyzer. The heavy metal analyzer comprises an industrial-grade integrated control unit, a detection unit, an automatic sampling unit, a water sample pretreatment unit and an external input / output unit. The online water heavy metal analyzer provided by the invention can utilize the industrial-grade integrated control unit for automatically controlling the detection unit, the automatic sampling unit, the water sample pretreatment unit and the external input / output unit through a communication interface. According to the online water heavy metal analyzer, the modularized idea is adopted, the number and the types of the units can be increased and reduced conveniently, meanwhile, components inside the units are independent and also can be increased and reduced. Due to the adoption of a low-cost standard network cabinet, the overall cost can be lowered and convenience can be brought for the data processing.