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天然水中铅的含量极低,常用测定方法有比色法,原子吸收法及阳极溶出法。在用比色法或原子吸收法测定水中亚ppb级铅时,往往要经过繁琐的分离及预富集过程,阳极溶出法通常可测定10~(-8)～10~(-9)M铅。将电化学富集法和无火焰原子吸收法的高灵敏度特点结合起来,测定更低浓度(10~(-10)M。以下)金属元素的技术近年来受到人们的重视。Ригин等利用这一技术成功地测定了水中ppb级的铅,但测定过程及装置比较复杂,而本
The content of lead in natural water is very low. The commonly used determination methods include colorimetric method, atomic absorption method and anodic dissolution method. In the determination of sub-ppb levels of lead in water by colorimetric method or atomic absorption method, it is often complicated to separate and pre-enrich the sample. Anodic stripping method usually can measure 10 -8 -8 -10 M lead . In recent years, the combination of the electrochemical enrichment method and the high-sensitivity non-flame atomic absorption spectrometry has attracted people’s attention in recent years for the determination of metal elements at lower concentrations (10 -10 M). Ригин such as the use of this technology successfully measured Pb ppb levels in water, but the measurement process and the device is more complicated, and Ben