摘要
报道了在(CPB-OP)微乳液介质中,以pH=10.40硼砂-NaOH为缓冲溶液,镉与邻硝基苯基荧光酮(o-NPF)生成1:3有色配合物,于620 nm处摩尔吸光系数为1.23×10~5L·mol^(-1)·cm^(-1)。镉含量在0～0.76μg·mL^(-1)范围内符合比耳定律,检出限为9.2×10^(-5)μg·mL^(-1)。采用巯基葡聚糖凝胶分离富集,可消除共存离子的干扰。该方法用于水样和污泥样品中的痕量镉的测定,结果满意。
In this paper, the color reaction of cadmium with o-nitrophenylflurone (o-NPF) in microemulsion has been studied. In the buffer medium of Borax-NaOH at 10.40, cadmium (Ⅱ) reacts with o-NPF to form a stable 1: 3 complex. Its apparent molar absorptivity is 1.23×10~5 L·mol^(-1)·cm^(-1) at 620 nm. Beer's law is obeyed in the range of 0～0.76μg.mL^(-1). The detection limit is 9.2×10^(-5) μg·mL^(-1). The coexistent metal ions can be separated and cadmium can be enriched by sulfhydryl dextrane gel (SDG), thus, the selectivity and sensibility of system could be improved greatly. The method characterizes with high sensitivity as well as high selectivity and can be used to determine trace amount of cadmium in water and sludge samples successfully.
出处
《分析科学学报》
CAS
CSCD
北大核心
2004年第4期397-399,共3页
Journal of Analytical Science
基金
山东省自然科学基金(No.Y2000809)
山东省科技计划资助项目(No.03C05)
关键词
微乳液
镉
邻硝基苯基荧光酮
光度法
巯基葡聚糖凝胶
分离富集
Microemulsion
Cadmium(Ⅱ)
o-Nitrophenylflurone, Spectrophotometry
Sulfhydryl Dextrane Gel
Preconcentration and Separation
