Determination of arsenic speciation in rice grain by IC-ICP-MS

摘要

The food safety has been becoming an important national and international focus in these days. Especially, arsenic (As) is considered one of the most important toxic elements in the environment because of its potential risk to human health and to ecosystems. So, We had developed the analysis method for arsenic speciation by using IC/ICP/MS and monitored the occurrence of arsenic species in rice grain. Five species of As were mainly detected in rice such as As~(+3), As~(+5), AsB, DMA and MMA. Based on the As speciation in rice, As~(+3) (Arsenite) and As~(+5)(Arsenate) were the major compounds and AsC was not detected. Arsenic speciation analysis of rice grains demonstrated that the inorganic forms were dominant in rice grain cultivated in Korea and USA. The concentration order of As species in rice grains was observed to As~(+3) > As~(+5). DMA > MMA. The percentages of inorganic As contents in rice samples from Korea and the USA were shown as similar results. The recoveries of fortified rice (500 ug/kg) were 91～112 %. The LODs of As speciation method had been defined as 0.1～0.3 ug/kg