薄膜梯度扩散-石墨炉原子吸收光谱法测定自来水中痕量Cd(Ⅱ)  

Determination of Trace Cadmium in Tap Water by Diffusive Gradients in Thin-Films Technique Combined with Graphite Furnace Atomic Absorption Spectrometry

作　　者：陈宏[1] 张晗[1] 封丽[2] 张梦晗[1] 郭连文[1] 励建荣[1] 陈颖[3] 

机构地区：[1]渤海大学化学化工与食品安全学院辽宁省食品安全重点实验室,辽宁锦州121013 [2]沈阳医学院化学教研室,辽宁沈阳110034 [3]中国检验检疫科学研究院,北京100123

出　　处：《食品科学》2015年第4期185-188,共4页Food Science

基　　金：“十二五”国家科技支撑计划项目(2012BAD29B06);辽宁省科学事业公益研究基金项目(2012003001);辽宁省食品安全重点实验室开放课题(LNSAKF2011038)

摘　　要：建立薄膜梯度扩散(diffusive gradients in thin-films,DGT)富集-石墨炉原子吸收光谱(graphite?furnace?atomic?absorption?spectrometry,GFAAS)法测定自来水中痕量Cd(Ⅱ)的新方法。先以聚天冬氨酸溶液为结合相的DGT装置富集自来水中Cd(Ⅱ),再使用GFAAS测定DGT结合相中Cd(Ⅱ)的含量,最后依据DGT方程计算自来水中Cd(Ⅱ)质量浓度。DGT-GFAAS法测得配制水中Cd(Ⅱ)的回收率为96.2%~101.7%;测得自来水中Cd(Ⅱ)质量浓度为0.21~0.35 mg/L,加标回收率为95.4%~107.0%,相对标准偏差为3.7%~7.4%;DGT-GFAAS法对自来水中Cd(Ⅱ)的检出限为0.002 5μg/L(采样48 h),可应用于饮用水中痕量Cd(Ⅱ)的定量测量。The Cd(Ⅱ) in tap water was enriched by diffusive gradients in thin-film(DGT) technique with sodium poly(aspartic acid)(PASP) as binding phase(PASP-DGT) and measured by graphite furnace atomic absorption spectrometry(GFAAS). The recoveries of Cd(Ⅱ) in the synthetic solutions measured by DGT-GFAAS method were 96.2%–101.7%. The concentration of Cd(Ⅱ) in tap water measured by DGT-GFAAS was 0.21–0.35 mg/L with recoveries of 95.4%–107.0% and RSD of 3.7%–7.4%. The detection limit of the DGT-GFAAS method was 0.002 5 μg/L(sampling time 48 h). Therefore, this method can be used to measure trace Cd(Ⅱ) in tap water.

关 键 词：镉 薄膜梯度扩散 石墨炉原子吸收光谱法 聚天冬氨酸 自来水 

分 类 号：O657.31[理学—分析化学] R123.1[理学—化学]