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温泉水中砷的浓度,以前曾有报道,但是,都没有涉及到砷的氧化数。作者等对温泉水中的砷(Ⅲ、Ⅴ)进行了分别定量分析,证明砷的氧化数与其来源有重要关系。三价砷和五价砷的分离,系采用磷酸铵镁(MgNH_4PO_4·6 H_2O)共沉淀法。于100ml水样中,加入磷酸二氢钾溶液(27g/l)5ml和镁混合液(氯化镁和氯化铵各100g溶于50ml浓氨水中,用水作成1升)4ml,加酚酞作指示剂,用1:1氨水调节试液的pH为9左右,放
The concentration of arsenic in hot spring water has been previously reported, but none of the arsenic oxidation numbers are involved. The authors quantitatively analyzed arsenic (Ⅲ, Ⅴ) in hot spring water separately and proved that the oxidation number of arsenic has an important relationship with its source. Trivalent arsenic and pentavalent arsenic separation, the Department of the use of magnesium ammonium phosphate (MgNH_4PO_4 · H_2O) coprecipitation. In 100ml of water, add 5ml of potassium dihydrogen phosphate solution (27g / l) and magnesium mixture (100g of magnesium chloride and ammonium chloride in 50ml of concentrated aqueous ammonia, make 1 liter with water) 4ml, add phenolphthalein as indicator, With 1: 1 ammonia to adjust the pH of the test solution is about 9, put