| 络合滴定法测定有机砷化合物中的砷 |
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| 引用本文： | 谢正秋,陶莉.络合滴定法测定有机砷化合物中的砷[J].武汉大学学报(理学版),1994(6). |
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| 作者姓名： | 谢正秋 陶莉 |
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| 作者单位： | 武汉大学化学系 武汉430072 |
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| 摘 要： | 介绍氧瓶或消化分解LaCl_3-EDTA和YCl_3-EDTA法测定有机砷化合物中砷的新方法。LACl_3-EDTA法适用于氧瓶分解,样品含硫有干扰;YCl_3-EDTA法不受SO_4~(2-)干扰,因而还适用于以硫酸为主要消化剂的消化分解和测定。测定误差<±0.30％。
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| 关 键 词： | 络合滴定 镧 钇 有机砷化合物 |
DETERMINATION OF ARSENIC IN ORGANOARSENIC COMPOUNDS BY LaCl_(3)-EDTA YC1_(3)-EDTA COMPLEXOMETRIC TITRATIONS |
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| Xie Zhengqiu,Tao Li.DETERMINATION OF ARSENIC IN ORGANOARSENIC COMPOUNDS BY LaCl_(3)-EDTA YC1_(3)-EDTA COMPLEXOMETRIC TITRATIONS[J].JOurnal of Wuhan University:Natural Science Edition,1994(6). |
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| Authors: | Xie Zhengqiu Tao Li |
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| Abstract: | Arsenic in organic compounds was determined by LaCl3-EDTA or YC13-EDTA indirect complexometric titration. The LaCl3-EDTA method was properly used for oxygen flask decomposition (iodine-water as absorbent) and SO42- interference , but the YC13-EDTA method was also used for digestion decomposition using H2SO4-HNO3 as the di-gestion agent. The formation of LaAsO4 or YAsO4 was carried out in pH5. 5 and boiling tem-perature. After cooling, an equal amount of alcohol and appropriate xylenol orange were added and the excess of LaCl3 or YC13 was titrated with 0. 01 mol ?L-1 EDTA. The maximun deriation in the determination of As was ?.30%. |
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| Keywords: | complexometric titration lanthanum yttrium organoarsenic compound |
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