ニッケル添加湿式灰化及び炭素炉原子吸光法による食品中総ヒ素の定量法

概要

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Wet digestion with nickel ion and atomic absorption spectrophotometric conditions with a graphite furnace (AAS-GF) were investigated in order to determine total arsenic in food samples. Food sample (1-5 g) was taken into 50 ml beaker and nickel nitrate solution (500 mg as Ni), 10 ml HNO_3,1 ml H_2SO_4,and 5 ml HClO_4 (60%) were added and heated for 7-10 h at 190℃ on a sand bath. The digested sample was filled up to 100 ml with water. Aliquot of sample is determined as follows. AAS-GF conditions : dry : 150℃, 25 A, 40 s ; ash : 1640℃, 120 A, 30 s, atom. : 2800℃, 310 A, 5 s ; sheath gas : argon, 3.01/min ; injection volume : 10 μl ; absorption wavelength : 193.7 nm. The loss of arsenic during the wet digestion was avoided by addition of nickel ion to sample, and when the arsenic was determined by AAS-GF, the effect of nickel ion resulting in an increase on absorption signal of arsenic was found. The results described above were obtained from the cross-check study on the method of Hirayama et al. proposed to the Pharmaceutical Society of Japan in order to establish the determination method of arsenic in food samples which would be adopted in the Standard Method of Analysis of Hygienic Chemists authorized by the same society.
社団法人日本薬学会の論文
1985-08-31