反相流动注射光度法直接快速检测海水中痕量Zn(Ⅱ)
Study on the Rapid and Direct Determination of Trace Amounts of Zinc(Ⅱ) in Seawater by Reversed Flow Injection Analysis Coupling with Spectrophotometry
作者：涂杰(四川大学 轻纺与食品学院, 四川 成都 610065)；张新申(四川大学 轻纺与食品学院, 四川 成都 610065)；佟玲(四川大学 建筑与环境学院, 四川 成都 610065)
Author：(School of Lighe Industry & Textile & Food Eng., Sichuan Univ., Chengdu 610065, China)；(School of Lighe Industry & Textile & Food Eng., Sichuan Univ., Chengdu 610065, China)；(School of Architecture and Enviroment, Sichuan Univ., Chengdu 610065 , China)
收稿日期：2008-01-20 年卷（期）页码：2008,40(5):89-93
期刊名称：工程科学与技术
Journal Name：Advanced Engineering Sciences
关键字：反相流动注射；1-（2-吡啶偶氮）-2-萘酚；光度分析；锌
Key words：reversed flow injection ; 1-(2-Pyridineazo)-2-naphthol (PAN); spectrophotometry; zinc
基金项目：国家863课题资助项目( 200514 )
中文摘要
在碱性条件下，1-（2-吡啶偶氮）-2-萘酚（PAN）与Zn(Ⅱ)生成ML2型螯合物，吐温80对其有增稳、增敏作用。基于此，建立了反相流动注射简便、快速、直接测定海水中痕量锌的新方法。在优化的实验条件下，可用人工海水代替真实海水绘制工作曲线，锌离子的线性范围为 1～400 μg/L（人工海水的相关系数为0.9977，n = 8），检出限（3σ）为 0.8 μg/L，回收率为 95.3%～103.0 %，相对标准偏差（RSD）为 0.43 % （20 μg/L的Zn(Ⅱ)添加于空白海水，n=16），对于海水盐度干扰及其在20.6‰～30.9 ‰范围内波动，该方法具有较强的抗干扰能力。将本法直接用于海水样品中Zn(Ⅱ)的分析，简便、快速，结果令人满意。
英文摘要
A new reversed flow injection analysis coupling with spectrophotometry for simple, rapid and direct determination of trace amounts of zinc ion in seawater was proposed, which was based on the reaction of 1-(2-Pyridineazo)-2-naphthol (PAN) with zinc ion in the alkali medium to form ML2 chelate complex, and on the sensitization and stabilization in the presence of the Tween 80. Under the optimum conditions, the working curve from the real seawater can be replaced by artificial seawater. The linear range for zinc ion is 1～400 μg/L and the relative coefficient of the artificial seawate is 0.9977. The detection limit （3σ） is 0.8 g/L, and the recovery percentages range from 95.3% to 103.0 %. The relative standard deviation (RSD) is 0.43 % for 20 μg/L zinc ion added in seawater ( n = 16 ). This method has strong anti interference capability on the effect of salinity and salinity fluctuation among the range of 20.6‰ ～30.9 ‰ in seawater. The proposed method was applied successfully to the rapid and direct determination of zinc ion in seawater samples with satisfactory results.
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