试验表明:在酸度为pH 1.0~6.0的水溶液中铜(Ⅱ)与硫氰酸根离子和氯化十六烷基吡啶(CPC)所生成的离子缔合沉淀,可从含有异丙醇3.0 mL及固体硫酸铵2.0 g,且总体积为10 mL的溶液中定量浮选分离.在反应体系中加入固定且过量的铜(Ⅱ),在浮选分离后,用PAR光度法在波长510 nm处测定下层盐水相中留剩的铜(Ⅱ).计算结果显示所得铜(Ⅱ)的浮选率与CPC浓度在1.0×10-5~1.2×10-4mol·L-1范围内呈线性关系.将此方法应用于间接测定模拟水样中CPC含量,测得CPC的回收率在95.0%~105.0%之间,测定值的相对标准偏差(n=5)在0.69%~1.54%之间.

It was found that a ternary ion association complex,Cu(SCN)4·(CPC)2 was formed in a slightly acidic medium of pH 1.0 to 6.0 and was separated by floatation from an aqueous medium containing 3.0 mL of 2-propanol and 2.0 g of solid (NH4)2SO4 in a total volume of 10 mL.A fixed and excess amount of Cu(Ⅱ) ion was added to the reaction mixture,and the amount of Cu(Ⅱ) remained in the aqueous salt phase after floatation was determined photometrically at the wavelength of 510 nm by its color reaction with PAR.Linear relationship between values of floatation rate of copper(Ⅱ) and mole concentration CPC was found in the range of 1.0×10-5-1.2×10-4mol·L-1.The proposed method was applied to the indirect determination of CPC in simulated water samples,giving values of recovery and RSD′s (n=5) in the ranges of 95.0%-105.0% and 0.69%-1.54% respectively.