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1 引言 砷对生物体及环境等危害极大,因此对砷的测定极为重要。现有的砷斑法及银盐法等因灵敏度低,往往不能满足工作要求。而氢化物原子吸收法及荧光法灵敏度虽高,但仪器昂贵,一时难以普及。近年来有关砷的溶出分析虽有报道,但利用表面活性剂的增敏作用未曾有人研究。本文经实验筛选发现在1.5mol/L HCl介质中,非离子表面活性剂聚乙烯醇-124(PVA-124)对砷的金膜电位溶出有极强的增敏作用。当在—0.40V下电沉积100s,用同位镀金样品标准加入法测量时,食品及天然水中砷(Ⅲ)的检出限分别高达4.0μg/kg及0.6
1 Introduction Arsenic is extremely harmful to organisms and the environment and is therefore extremely important for the determination of arsenic. The existing arsenic spot method and silver salt method due to low sensitivity, often can not meet the job requirements. The hydride atomic absorption spectrometry and fluorescence sensitivity is high, but the instrument is expensive, sometimes difficult to popularize. In recent years, although the analysis of arsenic dissolution has been reported, but the use of surfactant sensitization had not been studied. The experimental screening found that in 1.5mol / L HCl medium, the non-ionic surfactant polyvinyl alcohol-124 (PVA-124) has a very strong sensitizing effect on the dissolution of arsenic gold membrane potential. The detection limits of arsenic (Ⅲ) in food and natural water were as high as 4.0 μg / kg and 0.6 respectively when electrodeposited at -0.40 V for 100 s and plated with gold standard sample