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四乙基铅是重要大气污染物之一,主要由于使用加铅汽油而被引入空气中,对人体有严重危害。目前,国内外多用一氯化碘或碘-碘化钾溶液湿法采样,原子吸收光度或双硫腙比色法测定。湿法采样速度慢,吸收效率不高,且大批采样使用不便;双硫腙比色法灵敏度太低,而原子吸收光度法又受到仪器的条件限制。我们通过对各种固体吸附剂的筛选,确定以粒状活性炭富集大气中的四乙基铅,经浓硝酸消解浸出后用阳极溶出伏安法测定,获得较满意的结果。方法灵敏度高(检出下限为0.005微克),准确度和重现性较好,
Tetraethyl lead is one of the major air pollutants and is mainly introduced into the air as a result of the use of leaded petrol, which is a serious hazard to the human body. At present, many domestic and foreign iodine - potassium iodide - potassium iodide solution wet sampling, atomic absorption spectrophotometry or dithizone colorimetric determination. Wet sampling is slow, the absorption efficiency is not high, and a large number of sampling inconvenience; dithizone colorimetric sensitivity is too low, and the atomic absorption spectrophotometry by the instrument conditions. Through the screening of various solid adsorbents, we determined the enrichment of tetraethyl lead in the air by granular activated carbon, and determined by anodic stripping voltammetry after digestion and leaching with concentrated nitric acid. Satisfactory results were obtained. High sensitivity (detection limit of 0.005 micrograms), accuracy and reproducibility is better,