糙米、精米和碎米中16种元素及砷形态的测定
Determination of sixteen elements and arsenic species in brown, polished and milled rice.
作者信息
Narukawa Tomohiro, Matsumoto Eri, Nishimura Tsutomu, Hioki Akiharu
机构信息
National Metrology Institute of Japan (NMIJ), National Institute of Advanced Industrial Science and Technology (AIST).
出版信息
Anal Sci. 2014;30(2):245-50. doi: 10.2116/analsci.30.245.
The concentrations of 16 elements in 10 rice flour samples and the distribution of the elements in the rice grains from which the flour were made were determined by ICP-MS and ICP-OES after microwave-assisted digestion of the samples. Arsenic speciation analysis was carried out by HPLC-ICP-MS following heat-assisted extraction of the sample. The concentrations of inorganic As (As(III) and As(V)), monomethylarsonic acid (MMAA) and dimethylarsinic acid (DMAA) and their distribution in the rice grains were determined. Portions of the brown rice were polished/milled to different degrees to yield milled off samples and polished rice samples. All samples were powdered and analyzed for 16 elements and for As species. The recoveries and mass balances for all elements in all samples showed good agreements with the starting materials. As(III), As(V), MMAA and DMAA were detected, and the sums of the concentrations of all species in the extract were 86-105% of the total As concentration in each case.
对10份米粉样品中的16种元素进行了测定，并通过电感耦合等离子体质谱仪（ICP-MS）和电感耦合等离子体发射光谱仪（ICP-OES），在对样品进行微波辅助消解后，确定了制成这些米粉的稻谷中元素的分布情况。在对样品进行热辅助萃取后，通过高效液相色谱-电感耦合等离子体质谱仪（HPLC-ICP-MS）进行了砷形态分析。测定了无机砷（As(III)和As(V)）、一甲基胂酸（MMAA）和二甲基胂酸（DMAA）的浓度及其在稻谷中的分布情况。将糙米部分研磨/抛光至不同程度，得到磨下物样品和精米样品。所有样品均磨成粉末，分析其中的16种元素和砷形态。所有样品中所有元素的回收率和质量平衡与起始原料显示出良好的一致性。检测到了As(III)、As(V)、MMAA和DMAA，每种提取物中所有形态的浓度总和为总砷浓度的86%-105%。
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