关键词: 海马齿, 钠钾比, 膳食暴露, 健康风险, 微量元素

Abstract: In order to understand the pollution status of Sesuviumportulacastrum grown by seawater in Dongshan Bay, and to provide basic data for its reutilization, 15 kinds of inorganic elements such as K, Na, Cu, Zn, Pb, and Cd were detected. The result showed that Sesuviumportulacastrum was rich in mineral elements with the distribution as root >stem or leaf except Na and K. And it also seemed the contents of those elements in leave or stem with the distribution by Na>K>Mg>Ca>Fe/Mn>Zn>Cu>As> Cr/Ni>Se>Pb>Cd>Hg and the distribution in root was Na/K>Mg/Mn/Fe/Ca>Zn>Cu> Cr/Ni/Pb> As>Se>Cd> Hg. And the migration ability of Na was the strongest while the migration ability of Fe/Mn was the weakest. The Na/K ratio of stem and leaf was up to 8.58 and 3.84 respectively because of the stress on saline environment and it seemed to make S.portulacastrum tasted natural salty. Lastly, since the single factor pollution indexes were all less than 0.2, the MOE of inorganic arsenic and lead was 545 and 48 respectively, TTHQ was 0.099, Rn was 0.14 and Rc was 8.24×10-6.The populations exposed was harmless and the value for the level of the heavy metal pollution, the dietary exposure and the health risk of S.portulacastrum were relatively low.

Key words: Sesuviumportulacastrum；Na/K ratio；dietary exposure, health risk；trace element