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由于海水蒸发时有强的背景吸收,而Pb的原子吸收信号无法从这个背景吸收中分开,所以海水中Pb的测定通常是先分离富集而后测定。电沉析于石墨炉内壁法,钨丝电极电解富集插入石墨炉法等均是较好的方法,但是必需具有石墨炉设备才能实现上述各方法。本文是采用钨丝电解富集电热法,电解200秒,测定Pb的检测限可达0.05μg/1。对浓度为10ppb的Pb电解20次,相对标准偏差为7.9％。采用标准加入法,电解400秒,测定了海水中低于1ppb的Pb。
Since there is a strong background absorption when seawater evaporates, and the atomic absorption signal of Pb can not be separated from this background absorption, the determination of Pb in seawater is usually first separated and enriched and then measured. Electroanalysis in the graphite furnace wall method, tungsten electrode electrolysis enrichment graphite furnace insertion method is a better method, but must have a graphite furnace equipment in order to achieve the above methods. This article is the use of tungsten enrichment electrothermal method, electrolysis 200 seconds, the detection limit of detection of Pb up to 0.05μg / 1. The concentration of 10ppb of Pb electrolysis 20 times, the relative standard deviation of 7.9%. The standard addition method was used for electrolysis for 400 seconds to determine Pb below 1 ppb in seawater.