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• Arsenic hydride generation procedure: Measure the sample (0.002 ~0.01 mg arsenic equivalent) into a beaker, add sulfuric acid and nitric acid, and heat to decompose the sample.
• Rinse the decomposed sample with water, transfer to an arsenic hydride generation bottle (Erlenmeyer flask), add hydrochloric acid, potassium iodide solution, and tin chloride solution, and shake.
• The ball-shaped sphere in the conduit above the arsenic hydride generation bottle is filled with glass fibers moistened with a solution of lead acetate.
• Lead acetate solution adsorbs interfering gases other than arsenic hydride.
• Zinc is quickly poured into the arsenic hydride generation bottle, and arsenic hydride generated by leaving it for 1 hour is absorbed into silver diethyldithiocarbamate solution to produce color.
• To this solution add chloroform to dissolve completely, take a part of it, transfer it to an absorption cell, and measure the absorbance around 510 nm.
• The concentration of arsenic is calculated from the calibration curve.