Method for determining arsenic in apt by atomic fluorescence spectrometer

Abstract

The invention relates to a method for measuring arsenic in APT through an atomic fluorescence spectrometer. Specifically, a 100 g / L potassium hydroxide solution is adopted for dissolving an APT sample; in an ammoniacal solution, beryllium hydroxide is used for coprecipitation, and arsenic and base tungsten are separated; hydrochloric acid with the volume ratio of 8% is used for dissolving sediment, arsenic enters the solution, and finally the atomic fluorescence spectrometer is used for measuring arsenic. Through the method, tungsten and arsenic can be completely separated, disturbance caused by tungsten to arsenic measurement is completely eliminated, the accuracy of measurement is greatly improved, the requirement for measurement of trace arsenic in APT can be completely met, and the method is economical, simple, convenient, rapid and easy to operate.

Description

Technical field [0001] The invention relates to a method for measuring arsenic in APT by using an atomic fluorescence spectrometer. Specifically, a 100g / L potassium hydroxide solution is used to dissolve the APT sample, and the arsenic is co-precipitated with beryllium hydroxide in an ammonia solution to separate the arsenic from the matrix tungsten. The precipitation is dissolved by 8% hydrochloric acid, arsenic enters the solution, and finally the arsenic is measured with an atomic fluorescence spectrometer. Background technique [0002] APT is ammonium paratungstate. It is a white powdery substance containing about 89% tungsten trioxide. It also contains a small amount of ammonia, crystal water and trace amounts of cadmium, arsenic, silicon, aluminum, antimony, magnesium, lead, manganese, and nickel. , Chromium, iron, cobalt, bismuth, titanium, tin, vanadium, molybdenum, copper, etc. Mainly used as raw material for producing blue tungsten, yellow tungsten and ammonium metatun...

AI Technical Summary

Problems solved by technology

The sensitivity of colorimetry is not enough, and the operation is cumbersome; DC arc-atomic emission spectrometry can solve the problem of matrix interference, but the precision is poor, the sensitivity is not ideal, and it is very difficult to measure arsenic with a content below 0.0007%; inductively coupled plasma Bulk atomic emission spectrometry and inductively coupled plasma atomic mass spectrometry are expensive, difficult to popularize, and have serious matrix interference; hydride generation-atomic absorption spectrometry is not ideal for the determination of arsenic in APT

[0004] In summary, there is currently a lack of effective and easily popularized methods for the determination of arsenic in APT

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