四条好雄曾研究过Ni—CAS—PY—HDTAB体系的多元络合物显色反应,虽然灵敏度高,但该络合物稳定性差,实用性不够。文献报导了Ni与CAS在表面活性剂及吡啶类存在下,可形成高灵敏的四元络合物,虽然稳定性有所提高,但选择性较差。 笔者发现镍在吡啶类化合物的存在下。能与漂蓝6B和溴化十六烷基三甲基铵形成极其稳定的四元络合物,本体系迄今未见文献报导。 本文系统地研究了该体系多元络合物的最佳形成条件,并找到吡啶的代用品,测定了络合物的组成及摩尔吸光系数(1.1×10~5)。此外还试验了常见离子的干扰情况,大部分的阳离子均不干扰测定,或加入适当的掩蔽剂可消除之,从而提高了方法的选择性。以上述多元络合物体系为基础的分光光度方法,用于直接测定铝合金或纯铜中的镍量,均获得满意的结果。 Four good male had studied Ni-CAS-PY-HDTAB multicolor complex color reaction, although the high sensitivity, but the stability of the complex is poor, practicality is not enough. The literature reports that Ni and CAS can form highly sensitive quaternary complexes in the presence of surfactants and pyridines, although their stability is improved but their selectivity is poor. I found nickel in the presence of pyridine compounds. With bleached blue 6B and cetyl trimethyl ammonium bromide formation of extremely stable quaternary complex, the system has not been reported so far. In this paper, the optimal conditions for the formation of multiple complexes of the system were systematically studied, and pyridine substitutes were found. The composition and molar absorptivity (1.1 × 10 -5) of the complexes were determined. In addition, the interference of common ions was tested, and most of the cations did not interfere with the determination, or the addition of a suitable masking agent eliminated the selectivity of the method. The spectrophotometric method based on the above-mentioned multivalent complex system was used to directly measure the amount of nickel in the aluminum alloy or pure copper, and satisfactory results were obtained.