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Br J Ind Med 1970;27:40-42 doi:10.1136/oem.27.1.40
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Determination of lead chelated with ethylenediaminetetra-acetic acid in blood after precipitation of protein with perchloric acid

  1. A. A. Cernik
  1. Medical Branch, H.M. Factory Inspectorate, Department of Employment and Productivity, London

      Abstract

      Cernik, A. A. (1970).Brit. J. industr. Med.,27, 40-42. Determination of lead chelated with ethylenediaminetetra-acetic acid in blood after precipitation of protein with perchloric acid. A method is described for the determination of lead in whole blood containing ethylene-diaminetetra-acetic acid. Proteins were precipitated by 2·0 m perchloric acid. The ionized lead in the supernatant was chelated with ammonium pyrrolidine dithiocarbamate and was extracted with xylene. The method agreed well with a dry ashing technique (30 samples, correlation coefficient 0·985). Perchloric acid gave consistently good recoveries, unlike trichloroacetic acid, which frequently produced losses of up to 15%.

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