A Simple in situ Visual and Tristimulus Colorimetric Method for the Determination of Trace Arsenic in Environmental Water after Its Collection on a Mercury(II)-Impregnated Paper
A Simple in situ Visual and Tristimulus Colorimetric Method for the Determination of Trace Arsenic in Environmental Water after Its Collection on a Mercury(II)-Impregnated Paper
复制标题
DOI：
10.2116/analsci.20.165
复制
发表时间：
2004-01
影响因子：
1.6
通讯作者：
M. Rahman;K. Fujinaga;Y. Seike;M. Okumura
中科院分区：
文献类型：
--
作者：
M. Rahman;K. Fujinaga;Y. Seike;M. Okumura
本文提出了用溴化汞和氯化玫瑰苯胺浸渍试纸，经还原曝气捕集砷，现场目视三刺激比色法测定环境水中痕量砷的方法。砷化氢（AsH_3）是由砷（Ⅲ）（砷酸根离子）和砷（Ⅴ）（砷酸根离子）还原生成的，溴化汞（Ⅱ）与砷化氢（AsH_3）反应生成AsH（HgBr）_2（黄色）和（或）As（HgBr）_3（棕黄色），从而使试纸显色。向样品溶液中依次加入碘化钾、氯化锡（II）、锌砂和4ml 6M盐酸溶液。释放的砷化氢被收集在试纸上。通过三刺激色度计和目视法测量试纸上的黄色或棕黄色强度。该方法适用于河流、微咸水、海水等环境水样中砷的测定。
A simple in situ visual and tristimulus colorimetric method for the determination of trace arsenic in environmental water after collecting arsenic on a test paper impregnated with mercury(II) bromide and rosaniline chloride by its reduction aeration has been developed. The color development on the test paper is based on the formations of AsH(HgBr)_2 (yellow) and/or As(HgBr)_3 (brownish yellow) by a reaction between mercury(II) bromide and arsine (AsH_3), which is produced through the reduction of As(III) (arsenite ion) and/or As(V) (arsenate ion) in a sample solution. To a sample solution, potassium iodide, tin(II) chloride, zinc sand and 4 ml of 6 M hydrochloric acid solution were added successively. The liberated arsine was collected on the test paper. The yellow or brownish-yellow color intensity on the test paper was measured by a tristimulus colorimeter and also by a visual method. The established method is applicable to the determination of arsenic in environmental water sample such as river, brackish, and seawater types.