在线浓缩与流动注射分光光度法联用对水中痕量锌的测定  

On-line Preconcentration System Coupled to Flow Injection Spectrophotometry for the Determination of Trace Amounts of Zinc in Water

作　　者：魏良[1] 代以春 李辉[3] 张新申[4] 

机构地区：[1]西南科技大学环境与资源学院,四川绵阳621010 [2]四川省科学城神工环保有限公司,四川绵阳621900 [3]绵阳师范学院资源环境工程学院,四川绵阳621000 [4]四川大学皮革与工程教育部重点实验室,四川成都610065

出　　处：《分析测试学报》2008年第12期1386-1388,共3页Journal of Instrumental Analysis

摘　　要：pH 9.3的硼砂缓冲溶液中,在吐温-80存在的条件下,锌与1-（2-吡啶偶氮）-2-萘酚在水相中能形成络合物。将浓缩技术与流动注射分析技术联用,建立了在线自动测定环境水样中痕量锌的新方法。方法的线性范围为2.0-360μg/L,检出限为0.42μg/L;对质量浓度为5.0、50μg/L的锌离子进行8次平行测定,相对标准偏差（RSD）分别为3.55%和2.14%。将该方法应用于水体中痕量锌离子的测定,结果令人满意。An automated method was developed for the determination of zinc in water by application of on-line preconeentration in combination with flow injection speetrophotometry, based on the formation of water-soluble complex of Zn（ Ⅱ ）-1-（2-pyridineazo）-2-naphthol complex in presence of Tween- 80 and employing pH 9. 3 of sodium tetraborate as buffer solution. The linear range of the proposed method was between 2. 0 and 360 μg/L and the detection limit was 0. 42 μg/L. The relative standard deviation was 3.55% and 2. 14% for 5.0 μg/L and 50 μg/L of zinc standard solution（n =8）, respectively. The method was applied in the determination of zinc in water samples with satisfactory results.

关 键 词：锌 1-(2-吡啶偶氮)-2-萘酚 流动注射分光光度法 在线浓缩 

分 类 号：O657.32[理学—分析化学] O641.241[理学—化学]