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目的:建立快捷、灵敏检测锰(Ⅱ)的催化共振光散射新方法。方法:基于硫酸介质中,锰(Ⅱ)能催化溴酸钾氧化铬天青S(CAS)的反应,使其与溴化十六烷基三甲胺(CTMAB)缔合产生的共振光散射强度减弱,在一定条件下,共振光散射强度减小值与溶液中锰(Ⅱ)浓度成正比,据此建立了一种催化共振光散射分析法测定锰(Ⅱ)的新方法。结果:方法的线性范围为0.02~0.70μg/ml,检出限4.0μg/L,相对标准偏差为1.08~1.39%(n=11),样品加标回收率96.0%~102.7%。结论:方法灵敏度高、精密度好,用于水样、人发中痕量锰的测定,结果满意。
Objective: To establish a new method of fast and sensitive detection of manganese (Ⅱ) by catalytic resonance light scattering. Methods: In the sulfuric acid medium, manganese (Ⅱ) can catalyze the reaction of potassium bromate chrome azure S (CAS) to reduce the intensity of resonance light scattering produced by the association with cetyltrimethylammonium bromide (CTMAB) Under certain conditions, the decrease of resonance light scattering intensity is proportional to the concentration of manganese (Ⅱ) in the solution. A new method for the determination of manganese (Ⅱ) by catalytic resonance light scattering was established. Results: The linear range of the method was 0.02 ~ 0.70μg / ml with the detection limit of 4.0μg / L and the relative standard deviation of 1.08 ~ 1.39% (n = 11). The recoveries of spiked samples ranged from 96.0% to 102.7%. Conclusion: The method has high sensitivity and good precision, and is suitable for the determination of trace manganese in water samples and human hair. The results are satisfactory.