Device for extracting and concentrating arsenic-containing sample to be tested

Abstract

The invention discloses a device for extracting and concentrating an arsenic-containing sample to be tested. The device comprises a concentration bottle (2), a constant-temperature heater (1), an SO3 absorption bottle (9) and a gas guide pipe (5), wherein the concentration bottle (2) is arranged on the constant-temperature heater (1); the absorption bottle (9) is filled with alkali absorption liquid; the concentration bottle (2) and the absorption bottle (9) are provided with ground stoppers; the concentration bottle (2) is connected with the absorption bottle (9) through the gas guide pipe (5); and the tail end of the gas guide pipe (5) extends into the alkali absorption liquid. When the device is used for extracting and condensing the arsenic-containing sample, arsenic content is not affected and arsenic measuring accuracy is enhanced; simultaneously, environmental pollution is prevented in extraction and concentration processes.

Description

technical field [0001] The invention relates to an extraction and concentration device for arsenic-containing samples to be tested, belonging to the field of chemical analysis instruments. Background technique [0002] In the prior art, the process of measuring arsenic content in a sample by microcoulomb method is as follows: take an appropriate amount of sample and move it into a concentrating bottle, add concentrated sulfuric acid, place the concentrating bottle on an electric furnace to heat and evaporate, and obtain the extracted concentrate after cooling. Transfer the concentrate to the generating bottle, then connect the generating bottle to the calibrated microcoulomb arsenic analyzer, add potassium borohydride solution into the arsine generating bottle, and the instrument will automatically perform reaction titration to measure the arsenic content in the sample. The principle is: after the sample is extracted and concentrated with sulfuric acid, acidic potassium boro...

AI Technical Summary

Problems solved by technology

[0003] It turns out that when sulfuric acid is used to extract and concentrate samples, the concentration bottle is placed in an electric furnace that cannot be adjusted in temperature, and the highest surface temperature can reach several hundred degrees. Carbon deposition needs to add hydrogen peroxide to the sample, which will artificially increase the concentration of arsenic in the sample and make the measurement result too large

Concentrated H 2 SO 4 Decomposes into SO when heated 3 , SO 3 Has strong irritation and toxicity, no SO 3 Absorbing device, causing environmental pollution and causing great harm to the respiratory tract of operators

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