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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

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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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