反相流动注射催化动力学光度法测定微量锑(Ⅲ)  

Determination of micro antimony by reverse flow injection catalytic kinetic spectrophotometry

作　　者：柴红梅[1] 高楼军[1] 孙雪花[1] 李晓凤[1] 

机构地区：[1]延安大学化学与化工学院,陕西延安716000

出　　处：《冶金分析》2008年第7期42-45,共4页Metallurgical Analysis

基　　金：陕西省教育厅资助项目(SJG0503);延安大学科研基金资助项目(YDK2006-56)

摘　　要：在磷酸介质中，Sb（Ⅲ）对溴酸钾氧化2-[2＇-（5-硝基吡啶）偶氮]-1，8-二羟基萘-3，6二磺酸（5-NO2-PACA）褪色反应具有强烈的抑制作用。利用流动注射停留技术，建立了催化动力学光度法测定痕量锑㈣的新方法。该方法的线性范围为0～0．36μg／mL，检出限为9．6×10^-6g／L。应用于天然水样（山泉水和雨水）中微量锑㈣的测定，结果同原子吸收光谱法的测定结果相一致，相对标准偏差分别为0．75％，1．0％，回收率分别为92．5％和107％。A new method of flow injection catalytic kinetic spectrophotometry is developed for the determination of micro antimony（Ⅲ）. It is based on the anticatalytic property effects of Sb（Ⅲ）） on the oxidation reaction between 2-[2＇-（5-nitropyridylazo）]-1, 8-dihydroxynaphthalene-3,6-disulfonic acid （5- NO2-PACA） and potassium bromate in phosphoric acid medium. The linear range of determination is 0-0.36 μg/mL. The detection limit is 9.6 × 10^-6 g/L . The proposed method has been applied to the determination of Sb（Ⅲ） in environmental water samples such as mountain spring water and rain water, with the recovery of 92.5%, 107% and RSD of 0.75% and 1.0% respectively. The results are in good agreement with those of atomic absorption spectrometry.

关 键 词：2-[2'-(5-硝基吡啶)偶氮]-1 8-二羟基萘-3 6二磺酸 锑 流动注射 催化动力学光度法 

分 类 号：X832[环境科学与工程—环境工程]