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Application of selective evaporation in the determination of arsenic and bromine in dry biological material by thermal neutron activation analysis

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Abstract

The application of selective evaporation in an air-flow to the determination of arsenic and bromine in neutron-activated freeze-dried biological material is reported. Bromine is evaporated as Br2 during oxidative mineralisation. After addition of 48% HBr, arsenic is removed as AsBr3. The evaporated elements are collected in 7M NaOH;82Br (T=35.3 h) and76As (T=26.4 h) are used for quantitative assay. The chemical yield is (98±2)% for arsenic, irrespective of the amount of arsenic carrier. For bromine it varies from (70±10)% for carrier-free evaporation to (98±2)% if sufficient carrier is added. This addition is not permitted if arsenic has to be determined. The limits of determination are 5 ng·g−1 and 2 ng·g−1 respectively. The precision is ≤10% for both elements. The procedure is performed in a standardised apparatus. It was applied to the analysis of standard kale, orchard leaves and animal blood. Bromine was determined instrumentally for purpose of comparison.

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Authors and Affiliations

  1. Research Centre, 3. Westerduin Weg Petten (NH), The Netherlands

    C. A. Weers, D. Hoede & H. A. Das

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  1. C. A. Weers
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  2. D. Hoede
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  3. H. A. Das
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Weers, C.A., Hoede, D. & Das, H.A. Application of selective evaporation in the determination of arsenic and bromine in dry biological material by thermal neutron activation analysis. J. Radioanal. Chem. 42, 113–119 (1978). https://doi.org/10.1007/BF02520631

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  • DOI: https://doi.org/10.1007/BF02520631

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