摘要
为了探究AAS和ICP测定同一生活垃圾焚烧飞灰浸出液中Cd元素存在显著差异的原因,进行了盐分添加实验研究。研究结果表明:垃圾焚烧飞灰浸出液中高浓度的盐分(Na^+、K^+、Ca^(2+))是造成ICP和AAS测定结果巨大差异的主要原因。Na、K、Ca在紫外区产生的分子光谱与Cd分析线重叠,产生分子吸收干扰,采用氘灯对AAS进行背景吸收校正,Cd的测定值的相对误差小准确度高,测定值能有效地反映真实值的大小。
To study the signifcant differences between the tested concentrations of Cd in leachate of municipal solid waste incineration （MSWI） fy ash using induct-ively coupled plasma （ICP） and atomic absorption spectroscopy （AAS）, a salt-adding experiment were conducted. The results indicated that such differences could be relat-ed to the high concentrations of salts （Na＋、K＋、Ca2＋） in the leachate of MSWI fy ash. The molecular spectra of Na, K and Ca in the ultraviolet region overlap with the Cd analysis lines,produced molecular absorption interference. The background absorption correction of AAS using deuterium lamp,the interference of Na＋ to the determination of Cd is eliminated. The relative error of the measured value of Cd is small and accurate, and the measured value can effectively refect the size of the real value.
出处
《环境与发展》
2018年第1期121-122,共2页
Environment & Development
关键词
原子吸收光谱法
生活垃圾焚烧飞灰
盐分
背景吸收
消除
Atomic absorption spectroscopy
Municipal solid waste incineration fy ash
Background absorption
Salts
Eliminate
