Method for measuring arsenic in APT through atomic fluorescence spectrometer
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A technology of atomic fluorescence and spectrometer, which is applied in the field of determination of arsenic in APT by atomic fluorescence spectrometer, can solve the problems of expensive instrument, cumbersome operation, difficult to popularize, etc., and achieve the effect of improving accuracy, high sensitivity and easy operation
Active Publication Date: 2016-08-24
GANZHOU HUAXING TUNGSTEN PRODS
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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 i
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[0035] The present invention uses potassium hydroxide solution to decompose APT samples, co-precipitates arsenic with beryllium hydroxide in ammoniacal solution, realizes the separation of arsenic and matrix tungsten, and uses atomic fluorescence spectrometer to measure arsenic, which well solves the two problems of arsenic determination in APT. big difficulty.
[0036] 1. Determination of implementation conditions
[0038] Adding 16mL, 18mL, and 20mL concentration of 100g / L potassium hydroxide solution to decompose the APT sample respectively, the same APT sample (2# sample, the mass percentage of arsenic is 0.0018%) is measured, and the measurement results are shown in Table 2:
[0039] Table 2: Effect of 100g / L Potassium Hydroxide Solution Addition on Measurement Results
[0040]
[0041] As can be seen from Table 2, satisfactory results can be obtained if the amount of potassium hydroxide solution added is ...
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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 with an atomic fluorescence spectrometer. Specifically, a 100g / L potassium hydroxide solution is used to dissolve the APT sample, and beryllium hydroxide is used to co-precipitate the arsenic from the matrix tungsten in the ammonia solution. 8% hydrochloric acid dissolves the precipitate, and the arsenic enters the solution, and finally the arsenic is determined by atomic fluorescence spectrometer. Background technique [0002] APT is ammonium paratungstate, which is a white powdery substance, containing about 89% tungsten trioxide, and also contains a small amount of ammonia, crystal water and trace amounts of cadmium, arsenic, silicon, aluminum, antimony, magnesium, lead, manganese, nickel , chromium, iron, cobalt, bismuth, titanium, tin, vanadium, molybdenum, copper, etc. It is mainly used as raw material for the production of blue tungsten, yellow tungsten and ammonium metatungstate. ...
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