摘要
研究了在吐温-80溶液存在下，对硝基苯基重氮氨基偶氮苯与汞（Ⅱ）发生显色反应的条件，建立了新的测定微量汞（Ⅱ）的高灵敏度分光光度法。实验结果表明，在硼砂-氢氧化钠介质中，对硝基苯基重氮氨基偶氮苯与汞（Ⅱ）发生灵敏的显色反应，生成络合比为4：1的橙红色络合物；络合物的最大吸收峰位于484nm，表观摩尔吸光系数为1．4×10^7L·mol^-1·cm^-1；在10mL溶液中，汞（Ⅱ）量在0．08～0．25μg之间符合比尔定律，检出限为0．002mg／L；巯基葡聚糖凝胶分离富集后显色反应具有较强的抗干扰能力，可用于水、铅锌矿样品中微量汞㈣的测定，结果与原子吸收光谱法相一致，方法的回收率在97．29／6～104．7％之间，测得其相对标准偏差（n=6）≤3．2%。
The color reaction of chromogenic agent p-nitrophenyldiazoaminoazobenzene with Hg（Ⅱ） was studied in the presence of Tween-80. A novel spectrophotometric determination of trace Hg（Ⅱ） with high sensitivity was established. The results showed that, in Na2B4O2-NaOH medium, Cadion A reacted with Pig（Ⅱ） to form a orange red stable complex with the molar ratio of reagent ： metal of 4 ： 1. The maximum absorption peak of the complex was located at 484 nm with the apparent molar ab- sorptivity of 1.4 ×10^7 L·mol^-1· cm^-1. In 10 mL of solution , Beer＇s law was obeyed for 0.08- 0. 25 μg of Hg（Ⅱ）, and the detection limit is 0. 002 mg/L. Interference from existence ions could be avaided by separation with mercapto-dextran gel. This method was applied to the determination of Hg （Ⅱ） in water and lead-zinc ore samples. The results was consistent with those obtained by AAS method. Recovery was in the range of 97.2%-104.7%, and the RSD（n=6） was lower than 3.2%.
出处
《冶金分析》
CAS
CSCD
北大核心
2009年第12期61-65,共5页
Metallurgical Analysis
基金
淮海工学院海洋生物技术重点建设实验室基金项目(2005HS010
2005HS001)
江苏省科技厅自然科学基金(BK2005045)
淮海工学院自然科学基金(Z2006)
