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本文在MP-1型溶出分析仪上,研究了微分电位溶出法测定尿中痕量镉的方法,镉在含有KCl Hg~?的盐酸介质中于—0.68V(vs·SCE)处有一灵敏的溶出峰,利用该峰可测定低浓度镉在5～20ng/20ml及高浓度镉在20～100ng/20ml范围内,相关系数分别为r=0.9998及0.9993,检测限为0.05ng·ml,相对标准偏差为2.8%～10.9%,加标回收率为98.2%～100.7%,应用此法对美国国家标准局(NBS?SRM-1573蕃茄叶和国家一级标样GBW-09103冻干人尿进行分析,结果令人满意。
In this paper, MP-1 dissolution analyzer, the study of differential potentiometric stripping method for the determination of trace amounts of cadmium in urine, cadmium in hydrochloric acid containing KCl Hg ~? At -0.68V (vs · SCE) at a sensitive The results showed that the concentration of cadmium in the range of 5 ~ 20ng / 20ml and the high concentration of cadmium in the range of 20 ~ 100ng / 20ml were 0.9998 and 0.9993 respectively. The detection limit was 0.05ng · ml. The relative standard The deviations ranged from 2.8% to 10.9%, and the spiked recoveries ranged from 98.2% to 100.7%. This method was applied to the analysis of NBS® SRM-1573 tomato leaf and national standard GBW-09103 lyophilized human urine , The result is satisfactory.