食品科学

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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)

陈 宏1,张 晗1,封 丽2,张梦晗1,郭连文1,励建荣1,*,陈 颖3   

  1. 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
  • 出版日期:2015-02-25 发布日期:2015-02-16
  • 通讯作者: 励建荣
  • 基金资助:

    “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)

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

CHEN Hong1, ZHANG Han1, FENG Li2, ZHANG Menghan1, GUO Lianwen1, LI Jianrong1,*, CHEN Ying3   

  1. 1. Food Safety Key Lab of Liaoning Province, College of Chemistry, Chemical Engineering and Food Safety,
    Bohai University, Jinzhou 121013, China; 2. Department of Chemistry, Shenyang Medical College, Shenyang 110034, China;
    3. Chinese Academy of Inspection and Quarantine, Beijing 100123, China
  • Online:2015-02-25 Published:2015-02-16
  • Contact: LI Jianrong

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 atomicabsorption 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 5 μg/L(采样48 h),可应用于饮用水中痕量Cd(Ⅱ)的定量测量。

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

Abstract:

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.

Key words: cadmium, diffusive gradients in thin-films (DGT), graphite furnace atomic absorption spectrometry (GFAAS), poly (aspartic acid) (PASP), tap water

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