【摘要】 <正> 用双硫腙光度法测定金属离子已有多年历史,但一向采用萃取光度法。目前,不少工作者采用胶束增溶法,但尚有试剂配制及体系稳定性等问题尚未很好解决。前文报告了用多波长数据线性回归法同时测定Cu²⁺和Hg²⁺的探讨,本文采用双波长法,用非离子表面活性剂平平加作为溶剂,找出了双硫腙水相直接光度法测定锌的适宜条件。应用此法于粮食及工业废水中锌的测定,结果较为满意。更多还原

【Abstract】 A high sensitive and convenient spectrop4otometric method using dual wavelength for the determination of Zn has been proposed.The method is based on the formation of mixed micelle of nonionic surfactant, Peregal O〔C₁₈H₃₇O（CH₂CH₂O）₂₀H〕 and cationic surfactant, CTMAB, and solubilizing the complex of Zn with dithizone which is insoluble in water. Its apparent molar absorptivity ε（545/455） is 1. 09 × 10⁵l.mol^-1·cm^-1.The absorbance is constant in the H range 10. 512.Beer′s law is obeyed for 0 to 8μg/25ml.The method has been used for the determination of trace amounts of Zn in food and water,and the results aresatisfactory.更多还原