| 碘量法测定锌(锡)粒中的微量砷 |
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| 引用本文： | 王瑞斌.碘量法测定锌(锡)粒中的微量砷[J].西北轻工业学院学报,2006,24(3):65-68. |
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| 作者姓名： | 王瑞斌 |
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| 作者单位： | 榆林学院化学与化学工程学院,陕西榆林719000 |
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| 摘 要： | 研究了采用碘量法测定锌粒和锡粒中的微量砷。样品用酸溶解后，以铜盐作催化剂，用次磷酸盐将其中的砷化合物还原为单体砷，在中性溶液中将分离得到的单体砷溶解于定量的I2标准溶液里，过量的I2以淀粉为指示剂用Na2S2O3标准溶液滴定至终点。改进后的方法简单、快捷、干扰小，测定结果的RSD均小于5％，其加标回收率RZn％=92．4％～99．8％，RSn％=93．6％～100．5％。
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| 关 键 词： | 碘量法 锌粒 锡粒 微量砷 砷测定 |
| 文章编号： | 1000-5811（2006）03-0065-04 |
| 收稿时间： | 2006-02-11 |
| 修稿时间： | 2006年2月11日 |
DETERMINATION OF TRACE ARSENIC IN THE GRAINS OF ZINC AND TIN BY THE LODIMETRY METHODS |
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| WANG Rui-bin.DETERMINATION OF TRACE ARSENIC IN THE GRAINS OF ZINC AND TIN BY THE LODIMETRY METHODS[J].Journal of Northwest University of Light Industry,2006,24(3):65-68. |
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| Authors: | WANG Rui-bin |
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| Affiliation: | School of Chemistry and Chemical Engineering, Yulin College, Yulin 719000,China |
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| Abstract: | The study deals with the determination of trace arsenic in the grains of zinc and tin by the iodimetry methods.After dissolving the sample with the acid,with Cu~(2+) as the catalyst,by using the Na_3PO_2 reduction arsenic compound to monomer As.In the neutral solution,then dissolving the As with the standard solution of iodine,and with the starch as the indicator,the standard Na_2S_2O_3 solution is used to titration the rest of I_2.The improved method proves to be simple,fast,and without disturb.The RSD<5%,R_(Zn)% = 92.4% ~ 99.8%,and R_(Sn)% = 93.6% ~ 100.5%. |
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| Keywords: | iodimetry grains of zinc grains of tin trace arsenic determination of arsenic |
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