Method for preparing spectrally pure ultrafine silver chloride

Abstract

The invention relates to a method for preparing spectrally pure ultrafine silver chloride, which belongs to the technical field of inorganic chemistry. The technical problem solved by the invention is to provide a method for preparing spectroscopically pure ultrafine silver chloride. The method for preparing spectroscopically pure ultrafine silver chloride of the present invention comprises the following steps: a, take analytically pure silver nitrate solution, then drop the mixed solution of hydrochloric acid, ethanol, diethyl ether mixed solution in the solution until white precipitate is no longer generated; b, Stand still, make the precipitate settle completely, filter to obtain silver chloride precipitate; c, use 40-50wt% ethanol solution to wash; the silver chloride precipitate prepared in step b is 2-4 times, and then wash with distilled water at 50-60°C Silver chloride is precipitated several times until the pH value of the filtrate is 4.5-6.0, and no chloride ions are detected in the filtrate with silver nitrate; d, the washed silver chloride precipitate is dried to obtain spectrally pure ultrafine silver chloride.

Description

technical field [0001] The invention relates to a method for preparing spectrally pure ultrafine silver chloride, which belongs to the technical field of inorganic chemistry. Background technique [0002] In spectroscopic analysis, silver chloride is usually used as a buffer to improve the analytical sensitivity of rare earth elements, rare elements, etc. The silver chloride used in laboratory analysis and testing is generally commercially available analytically pure silver chloride, and spectrally pure silver chloride with higher purity is generally difficult to buy, even if it is commercially available, its silver chloride crystal form is also Irregular angular particles (minimum particle size up to 10 meshes) cannot be ground into powder, and cannot be completely mixed with the sample to be tested, so they cannot play the role of a buffer. For the analysis and testing of trace metal elements in high-purity rare earths, rare metals and their compounds, because high-purity...

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Problems solved by technology

The silver chloride used in laboratory analysis and testing is generally commercially available analytically pure silver chloride, and spectrally pure silver chloride with higher purity is generally difficult to buy, even if it is commercially available, its silver chloride crystal form is also Irregular angular particles (minimum particle size up to 10 meshes), cannot be ground into powder, cannot be completely mixed with the sample to be tested, and thus cannot play the role of a buffer

For the analysis and testing of trace metal elements in high-purity rare earths, rare metals and their compounds, because high-purity silver chloride that meets the requirements cannot be obtained, the accuracy of the analytical data will be affected, and even serious distortion of the data will be caused. degree difference

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