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随着铊化物的日益广泛应用,不仅污染了环境,且增加了职业性铊中毒的潜在危险性,直接危害人体健康,故对其超痕量的测定日益为人们所重视。 Bonelli等在HAc-NaAc/EDTA介质(pH4.6)中,以差分脉冲阳极溶出伏安法(DPASV)直接测定天然水中铊,电积10分钟,检测限为5.0×10~(-11)M。Lime等采用汞膜电极DPASV法测定了岩矿及生物物质中的铊,电积10分钟,检测限为1ng/g。此法前处理复杂且需特殊仪器。本文以汞膜电极研究了铊的阳极溶出行为,发现在Britton-Robinson(简称BR)溶液中,铊的溶出峰敏锐、加入DCTA能有效地消除镉、铅等金属离子干扰,
With the increasing application of thallium, it not only pollutes the environment, but also increases the potential risk of occupational thallium poisoning and directly endangers human health. Therefore, it is increasingly valued by people for its ultra-trace determination. In the HAc-NaAc / EDTA medium (pH 4.6), Bonelli et al. Directly measured thallium in natural water by differential pulse anodic stripping voltammetry (DPASV) for 10 minutes with a detection limit of 5.0 × 10 ~ (-11) M . Lime and other mercury electrodes using the DPASV method for the determination of rock and mineral substances thallium, electrowinning 10 minutes, the detection limit of 1ng / g. This method before processing complex and need special instruments. In this paper, the anodic dissolution behavior of thallium was studied with mercury membrane electrode. It was found that in Britton-Robinson (BR) solution, the dissolution peak of thallium is acute. Adding DCTA can effectively eliminate the interference of cadmium and lead,