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Rapid on-line solid phase enrichment using polytetrafluoroethylene beads for chromium speciation in contaminated real water samples

  • N. Sharma
  • S. Tiwari
  • R. SaxenaEmail author
Original Paper
  • 71 Downloads

Abstract

Due to unchecked disposal of industrial wastes into surrounding areas, the pollution of water bodies with heavy metal toxicants has become an environmental menace. The toxicity of chromium species depends on its oxidation states, and thus regular monitoring of environmental water sources vulnerable to pollution is a must. In this regard, an on-line method for chromium speciation and determination using FAAS has been proposed. The flow-injection preconcentration mini-column containing polytetrafluoroethylene beads was used as the solid phase extractant, and chromium speciation was done by complexing Cr(III) and Cr(VI) with thiosemicarbazide chelating agent. The figures of merit for Cr(III) and Cr(VI) obtained were 61 and 56 (preconcentration factors); 0.13 and 0.14 µg L−1 (detection limits); 1.6 and 1.3% (R.S.D.). The optimized method for chromium speciation was successfully applied to industrial and Yamuna River water samples. The method validation was carried out using SRM 1640a (Trace Elements in Natural Water, NIST), and recovery > 95% was obtained.

Keywords

Flame atomic absorption spectrometry Flow-injection Hyphenated system Preconcentration Solid phase extraction Thiosemicarbazide 

Notes

Acknowledgements

The authors are thankful to the SERB Project No. SR/S1/IC/64-2012, Department of Science and Technology (DST), New Delhi, India for financial assistance.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Islamic Azad University (IAU) 2017

Authors and Affiliations

  1. 1.Department of Chemistry, Kirori Mal CollegeUniversity of DelhiDelhiIndia

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