摘要
研究了流动注射二溴对甲偶氮磺分光光度法测定不同水中的Pb.在1.2 mol/L HNO3中,经过富集后的Pb^2＋与二溴对甲偶氮磺形成络合物,该络合物在630 nm有最大吸收峰,且能稳定存在至少15 h.优化了反应的化学因素和流动注射系统反应条件.该方法的检出限和线性范围分别为0.1和0.5～500 μg/L,对含量为5 μg/L、2 μg/L Pb标准溶液进行了11次平行测定, 其相对标准偏差分别为1.1%和2.5%.应用于自来水、河水、池塘水、海水中痕量Pb的测定,结果令人满意.与其它测定Pb的标准方法对比吻合很好.
A simple, accurate, sensitive and selective flow injection （FI） system for the determination of Pb（ Ⅱ ） at trace level with a preconcentration step and spectrophotometric detection was proposed. It is based on the preconcentration of lead ions on precolum and dibromo-methyl sulfonazo-lead complex formation in 1.2 mol/L nitric acid medium with sensitive absorption peak at 630 nm. The experimetnal conditions were optimized. The method provided a liner range between 0.5 to 500 μg/L, a detection limit of 0.1 μg/L and a sample throughout of 24 h. The relative standard deviation was 2.5 % for 1.0 μg/L, 1.1% for 5.0 μg/L, lead（ Ⅱ ） （n = 11 ）. The method has been applied to the determination of lead in natural , tap water and seawater samples, and the results of spiked samples are in good agreement with those of inductively coupled plasma-atomic emission spectrometry.
出处
《分析化学》
SCIE
EI
CAS
CSCD
北大核心
2006年第10期1471-1474,共4页
Chinese Journal of Analytical Chemistry
基金
国家高技术研究发展规划(863)项目(No.2002AA639290)
关键词
流动注射
铅
富集
痕量分析
Flow injection, lead （ Ⅱ ）, preconcentration, trace analysis
