47 results about "Nitratine" patented technology

The invention discloses a method of determining silver content in rock minerals. The method comprises the following steps: preparing a silver standard storage solution; preparing a silver standard solution; determining absorbance of the silver standard storage solution by using an atomic absorption spectrometer and a silver hollow cathode lamp and drawing a working curve; taking a sample; adding nitric acid, hydrochloric acid, hydrogen peroxide, an ammonium fluoride solution and a sodium chlorate solution, carrying out microwave digestion, heating and drying an obtained mixed solution with steam, adding hydrochloric acid and nitric acid, dissolving solids, transferring an obtained solution to a volumetric flask, diluting the solution with distilled water until the liquid level of the solution reaches a scale mark, shaking up the solution, determining absorbance of silver in the obtained sample solution by using the atomic absorption spectrometer and the silver hollow cathode lamp, carrying out blank tests on associated samples, and calculating the concentration of silver in the sample according to a formula. The invention has the advantages of convenience, fastness, a small usage amount of reagents, low cost for determination and no discharge of a great amount of acid gas, is favorable for protecting environment and health of operational personnel, avoids loss of the sample inthe sample solution, enables precision of analysis to be enhanced, labor intensity to be reduced, time to be saved and work efficiency to be improved, and has a wide application scope.

The invention discloses a method for detecting nitrite based on silver-coated gold nanoparticles, comprising the following steps: adding appropriate amount of HCl, AA and AgNO to the gold nanoparticles 3 , to prepare silver-coated gold nanoparticles; the glass slides were sequentially soaked in MPTMS solution, silver-coated gold nanoparticles solution, and saturated solution of naphthaleneethylenediamine hydrochloride; The solutions are mixed to form a mixed solution A; the modified glass slide is immersed in the mixed solution A, after the reaction is completed, the glass slide is washed with ultrapure water and dried, and then the light intensity of the silver-coated gold nanoparticles is observed through a dark field microscope Changes detected in nitrite levels. The method for detecting nitrite provided by the silver-coated gold nanoparticles provided by the invention has the advantages of convenience, quickness, low detection limit, high sensitivity, good selectivity, and spatial resolution ability for detection.

The invention discloses a method for preparing a rare earth vanadate film by replacement reaction, which comprises the following steps: dissolving a rare earth nitrate compound in deionized water to prepare a rare earth ion solution; placing it in a water bath at a certain temperature to obtain a spare electrode A deposition solution; a three-electrode system is formed; the three-electrode system is inserted into a spare electrodeposition solution, and a layer of electrodeposition film is deposited on the working electrode; the electrodeposition film is rinsed with deionized water and absolute ethanol respectively, and then dried to prepare The rare earth layered hydroxide film is obtained; the sodium vanadate solution is prepared, and the pH of the solution is adjusted; the sodium vanadate solution and the electrodeposited rare earth layered hydroxide film are put into a hydrothermal reaction kettle for replacement reaction; cooled to room temperature, washed , dried to obtain rare earth vanadate LnVO 4 film. The rare earth vanadate film prepared by the invention has good regularity, high adhesion, good dispersion and excellent crystallinity.