Comparison of on-site field measured inorganic arsenic in rice with laboratory measurements using a field deployable method: Method validation

Angstone Thembachako Mlangeni, Valeria Vecchi, Gareth J. Norton, Andrea Raab, Eva M. Krupp, Joerg Feldmann

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A commercial arsenic field kit designed to measure inorganic arsenic (iAs) in water was modified into a field deployable method (FDM) to measure iAs in rice. While the method has been validated to give precise and accurate results in the laboratory, its on-site field performance has not been evaluated. This study was designed to test the method on-site in Malawi in order to evaluate its accuracy and precision in determination of iAs on-site by comparing with a validated reference method and giving original data on inorganic arsenic in Malawian rice and rice-based products. The method was validated by using the established laboratory-based HPLC-ICPMS. Statistical tests indicated there were no significant differences between on-site and laboratory iAs measurements determined using the FDM (p=0.263, ά=0.05) and between on-site measurements and measurements determined using HPLC-ICP-MS (p=0.299, ά=0.05). This method allows quick (within 1 hour) and efficient screening of rice containing iAs concentrations on-site.
Original languageEnglish
Pages (from-to)180-185
Number of pages6
JournalFood Chemistry
Early online date30 Apr 2018
Publication statusPublished - 15 Oct 2018



  • Rice
  • arsenic
  • field deployable method
  • inorganic arsenic
  • laboratory
  • onsite
  • maximum contaminant limit

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