Determination of Thallium and Other Heavy Metals in Rice by ICP-MS and Assessment on Rice Safety by Thallium Contamination

Abstract

Abstract: A method was founded for determination of thallium and other heavy metal elements in rice by inductively coupled plasma mass spectrometry (ICP-MS), and the safety of rice contaminated by thallium was evaluated. The working condition for ICP-MS and the interference effects of method were investigated. Under the optimum experimental conditions, the detection limit of thallium is 0.006μg/L, and for other elements their detction limits are in range of 0.008～0.30μg/L. The spiked recoveries for Tl, Co, Ni, Cu, Mo, Cd, and Pb are between 94.2% and 103.7%. Using this method,the distribution of thallium and the absorption of many other heavy metal elements in rice growing in thallium contaminated soil were analyzed. The results showed that thallium content in the stem and leaf is higher than that in the seed. Thallium can stimulate the stem and leaf of rice to absorb some other heavy metals, but restrain the rice seed to do so.

Key words: ICP-MS, rice (Oryza sativa), thallium, heavy metal

YAO Yan, CHEN Yong-Heng, WANG Chun-Lin, QI Jian-Ying, ZHANG Ping, WANG Xu-Nuo. Determination of Thallium and Other Heavy Metals in Rice by ICP-MS and Assessment on Rice Safety by Thallium Contamination[J]. FOOD SCIENCE, 2008, 29(7): 386-388.

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Determination of Thallium and Other Heavy Metals in Rice by ICP-MS and Assessment on Rice Safety by Thallium Contamination

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