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Zn(Ⅱ)与KSCN和丁基罗丹明B形成稳定的三元离子缔合物,研究了其在由乙醇和磷酸氢二钾组成的双水相体系中的最佳分配条件。实验表明,在p H 4.0的HAc-Na Ac缓冲溶液中,Zn(SCN)42-与丁基罗丹明B形成的缔合物(BRh B)2[Zn(SCN)4]的最大吸收波长为559 nm,锌(Ⅱ)在0.02~0.30μg/m L范围内符合比尔定律,其相关系数为0.999 6,表观摩尔吸光系数ε为3.4×105L/(mol·cm)。该方法具有处理时间短、操作过程简便优点,结果与原子吸收法结果一致。
Zn (Ⅱ) forms a stable ternary ion association with KSCN and butyl rhodamine B, and its optimum distribution conditions in aqueous two-phase system composed of ethanol and dipotassium phosphate have been studied. Experiments show that the maximum absorption wavelength of the complex (BRh B) 2 [Zn (SCN) 4] formed by Zn (SCN) 42- and butyl rhodamine B in HAc-Na Ac buffer solution of p H 4.0 is Beer’s law was obeyed at 559 nm and zinc (Ⅱ) in the range of 0.02-0.30 μg / m L with a correlation coefficient of 0.999 6 and an apparent molar absorptivity ε of 3.4 × 105 L / (mol · cm). The method has the advantages of short processing time and simple operation, and the result is consistent with the result of the atomic absorption method.