摘要
用滤纸与NaOH和二硫化碳作用形成纤维素黄原酸酯滤纸 ,使其吸附植物叶片处理液中的Cu2 + ,形成稳定的黄色螯合物 ,用光度法测定铜的含量。检出限为 6.4 μg·L- 1,相对标准偏差小于 3% ,Zn2 + 、Fe2 + 、Ca2 + 、Mg2 +
The cellulose xanthate is prepared by immersing the filter paper successively in 100g·L -1 NaOH solution and carbon disulfide. The filter paper is then washed with distilled water until it is neutral, and finally dried at 50℃. The copper(Ⅱ) is desorbed from the plant leaves by stripping with acidified water. An aliquot of the sample solution is taken and Cu(Ⅱ) is adsorbed on a piece of the cellulose xanthate on which a stable yellow chelate is formed. The absorbance of this yellow chelate is determined at 400nm with the 721 spectrophotometer. Its detection limit is 6.4μg·L -1 . RSD′s obtained are less than 3%. Zinc (Zn 2+ ), Fe 2+ , Ca 2+ and Mg 2+ do not interfere with the determination.
出处
《理化检验（化学分册）》
CAS
CSCD
北大核心
2001年第11期503-504,共2页
Physical Testing and Chemical Analysis(Part B:Chemical Analysis)
