Adaptability of wet decomposition method to food samples for the determination of arsenic by arsine generation-atomic absorption spectrophotometry

DOI NDL Digital Collections Web Site Web Site
  • YASUI Akemi
    National Food Research Institute, Ministry of Agriculture and Forestry
  • TSUTSUMI Chuichi
    National Food Research Institute, Ministry of Agriculture and Forestry

Bibliographic Information

Other Title
  • アルシン‐原子吸光法による微量ひ素定量における湿式分解法の食品試料への適用
  • アルシン ゲンシ キュウコウホウ ニヨル ビリョウ ヒソ テイリョウ ニ オケ
  • アルシン-原子吸光法による微量ヒ素定量における湿式分解法の食品試料への適用

Search this article

Abstract

A simple and rapid wet decomposition method with nitric, sulfuric, and perchloric acids was adapted to various food samples. The procedure is as follows: (0.252.5)g (dry weight) of food and 10ml of concentrated nitric acid are taken into a 100ml bolosilicate glass beaker (arsenic free) and mixed thoroughly. The mixture is heated gently on hot plate-sand bath at (170220)°C covered with a bolosilicate glass watch dish (arsenic free). After subsidence of the sample foaming, the pre-decomposed mixture is cooled and 3ml of concentrated nitric acid, 2.5ml of concentrated sulfuric acid and 5ml of perchloric acid (60%) are added. The mixture is heated strongly on hot platesand bath at (300380)°C to steady boiling. If slight charring occurs, analysis loss can be prevented by immediate addition of a small amount of concentrated nitric acid. Perchloric acid is boiled off and residual sulfuric acid is concentrated to less than 1ml. The residue is washed into a 25 or 50ml volumetric flask with 3N hydrochloric acid after cooling. Arsenic is then determined by arsine generation-atomic absorption spectrophotometry. It takes (1.52.0) hrs to accomplish the decomposition. Recoveries of inorganic arsenic (arsenic trioxide) or organic (p-arsanilic acid) added to various foods were (93105) %. It was suggested that recovery of arsenic was independent of matrix of food, form of arsenic and presence of large amount of sodium chloride. Precision was (58) % R.S.D. at 0.1μg arsenic trioxide and (14)% at 0.4μg. Analysis of NBS standard reference material (orchard leaves) for arsenic by this method showed a good agreement with certified value. This decomposition method would be adaptable to the determination of arsenic in almost all kinds of foods.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 26 (12), 809-814, 1977

    The Japan Society for Analytical Chemistry

Keywords

Details 詳細情報について

Report a problem

Back to top