生活垃圾焚烧飞灰浸出液中盐分对AAS测定镉的干扰与消除
|
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 significant differences between the tested concentrations of Cd in leachate of municipal solid waste incineration(MSWI) fly 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~+、Ca~(2+)) in the leachate of MSWI fly 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 reflect the size of the real value.
To study the significant differences between the tested concentrations of Cd in leachate of municipal solid waste incineration(MSWI) fly 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~+、Ca~(2+)) in the leachate of MSWI fly 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 reflect the size of the real value.
引文
[1]李娜,郝庆菊,江长胜等.重庆市垃圾焚烧飞灰粒径分布及重金属形态分析[J].环境化学,2010,29(4):659-664.
[2]Belevi H,Langmeier M.Factors determining the element behavior in municipal solid waste incinerators 2.Laboratory experiments[J].Environmental Science and Technology,2000,34(12):2507-2512.
[3]万晓,王伟,叶暾旻等.垃圾焚烧飞灰中重金属的分布与性质[J].环境科学,2005,26(3):172-175.
[4]李慧,罗琳,卢海威等.生活垃圾焚烧飞灰重金属药剂稳定化研究[J].环境工程学报,2016,10(2):929-934.
[5]欧阳创,张瑞娜,毕珠洁等.生活垃圾焚烧厂飞灰重金属特性分析[J].环境卫生工程,2015,23(5):35-38.
[6]韩大健,王文祥,孙水裕等.城市生活垃圾焚烧飞灰中钾盐浸出研究[J].环境科学学报,2017,37(6):2223-2231.
[7]沈东升,郑元格,姚俊等.典型固体废物焚烧飞灰的污染物特性研究[J].环境科学,2011,32(6):2610-2616.
[8]李述信.原子吸收光谱分析中的干扰及消除方法[M].北京:北京大学出版社,1987.
[9]郭明才.邻近非共振线校正背景—火焰原子吸收光谱法测定高盐食品中的铅[J].光谱实验室,2013,30(6):3017-3021.
[2]Belevi H,Langmeier M.Factors determining the element behavior in municipal solid waste incinerators 2.Laboratory experiments[J].Environmental Science and Technology,2000,34(12):2507-2512.
[3]万晓,王伟,叶暾旻等.垃圾焚烧飞灰中重金属的分布与性质[J].环境科学,2005,26(3):172-175.
[4]李慧,罗琳,卢海威等.生活垃圾焚烧飞灰重金属药剂稳定化研究[J].环境工程学报,2016,10(2):929-934.
[5]欧阳创,张瑞娜,毕珠洁等.生活垃圾焚烧厂飞灰重金属特性分析[J].环境卫生工程,2015,23(5):35-38.
[6]韩大健,王文祥,孙水裕等.城市生活垃圾焚烧飞灰中钾盐浸出研究[J].环境科学学报,2017,37(6):2223-2231.
[7]沈东升,郑元格,姚俊等.典型固体废物焚烧飞灰的污染物特性研究[J].环境科学,2011,32(6):2610-2616.
[8]李述信.原子吸收光谱分析中的干扰及消除方法[M].北京:北京大学出版社,1987.
[9]郭明才.邻近非共振线校正背景—火焰原子吸收光谱法测定高盐食品中的铅[J].光谱实验室,2013,30(6):3017-3021.