Determination of arsenic in soils, foods, organic compounds, etc.
Determination of arsenic in soils, foods, organic compounds, etc.
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DOI：
10.1039/an9426700279
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发表时间：
1942-01-01
期刊：
影响因子：
4.2
通讯作者：
Duffield, W. D.
中科院分区：
文献类型：
--
作者：
Milton, R.;Duffield, W. D.
使材料经受用HNO3和H2SO4的湿式氧化，注意避免在早期阶段过热并在最后阶段除去所有HNO3。稀释后，向所得溶液中加入1 ml. 50%碘化钾溶液和1 ml.加入SnCl 2，全部加热至沸腾，砷转化为三价态。然后在Gutzeit罐中以AsH3形式释放As，并使AsH3通过毛细管进入5ml的混合物中。0.02 N碘溶液和1 ml.砷被氧化成五价的H_3AsO_4，在Spekker吸光光度计上通过砷钼酸盐还原产生的强烈蓝色来评价。详细说明了必要的预防措施。W.天啊
The material is submitted to wet oxidation with HNO 3 and H2S04, care being taken to avoid overheating ha the early stages and to remove all the HNO3 in the final stage. To the resulting solution, after dilution, 1 ml. of 50 per cent. KI solution and 1 ml. of 40 per cent. SnCl2 are added and the whole heated to boiling, the As being converted, to the tervalent condition. The As is then liberated as AsH3 in a Gutzeit pot and the AsH3 passed by a capillary tube into a mixture of 5 ml. of 0.02 N iodine solution and 1 ml. of N NaHCO, , the As being oxidized to quinquevalent H3AsO4, which is evaluated on a Spekker absorptiometer by the intense blue colour produced by reduction of the arsenomolybdate. The necessary precautions are detailed.-W. Godden.