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在水溶液中钴(Ⅱ)与亚硝基R盐所形成的配合阴离子可以与有机碱阳离子(结晶紫)缔合形成中性缔合分子。在聚乙烯醇存在下,配合物可稳定存在于水溶液中。钴(Ⅲ)-亚硝基R盐-结晶紫配合物在510nm处有一最大吸收,摩尔吸光系数ε_(510)=1.47×l0~5L·mol~(-1)·cm(-1)。配合物中各组分的摩尔比为:Co:R:CV=1:3:6。反应具有较高的选择性,采用双峰双波长法测定钴可使灵敏度得到进一步提高,相应的摩尔吸光系数ε_(510-640)=4.09×10~5L·mol~(-1)·cm~(-1)。方法用于合成试样中钴的测定,结果满意。
The complex anions formed by cobalt (II) and nitroso R salts in aqueous solution can associate with organic base cations (crystal violet) to form neutral associative molecules. In the presence of polyvinyl alcohol, the complex can be stably present in aqueous solution. The cobalt (Ⅲ) - nitroso R salt - crystal violet complex has a maximum absorption at 510 nm with a molar absorptivity of ε 510 (510) = 1.47 × 10 5 L · mol -1 (cm -1). The molar ratio of each component in the complex is: Co: R: CV = 1: 3: 6. The reaction has high selectivity. The determination of cobalt by bimodal double-wavelength method can further improve the sensitivity. The corresponding molar extinction coefficient ε 510-640 = 4.09 × 10 -5 L · mol -1 -1 · cm -1. (-1). The method was applied to the determination of cobalt in synthetic samples with satisfactory results.