Istituto Superiore per la Protezione e la Ricerca Ambientale (ISPRA), Piazzale dei Marmi 12, 57123, Livorno, Italy,
Environ Sci Pollut Res Int. 2014 May;21(9):5952-9. doi: 10.1007/s11356-014-2538-z. Epub 2014 Jan 24.
This study focused on the exposure of the common ragworm Hediste diversicolor (Müller 1776) to sediments enriched with different arsenic compounds, namely arsenate, dimethyl-arsinate, and arsenobetaine. Speciation analysis was carried out on both the spiked sediments and the exposed polychaetes in order to investigate H. diversicolor capability of arsenic bioaccumulation and biotransformation. Two levels of contamination (acute and moderate dose) were chosen for enriched sediments to investigate possible differences in the arsenic bioaccumulation patterns. The highest value of arsenic in tissues was reached after 15 days of exposure to dimethyl-arsinate (acute dose) spiked sediment (1,172 ± 176 μg/g). A significant increase was also obtained in worms exposed both to arsenate and arsenobetaine. Speciation analysis showed that trimethyl-arsine oxide was the predominant chemical form in tissues of H. diversicolor exposed to all the spiked sediments, confirming the importance of this intermediate in biological transformation of arsenic.
本研究关注的是多毛类环节动物（Hediste diversicolor）（Müller 1776）暴露于富含不同砷化合物的沉积物中的情况，这些砷化合物包括砷酸盐、二甲基砷酸酯和砷甜菜碱。对添加砷的沉积物和暴露的多毛类动物进行了形态分析，以研究 H. diversicolor 对砷的生物积累和生物转化能力。选择了两种污染水平（急性和中度剂量）的富砷沉积物，以研究砷生物积累模式的可能差异。在暴露于二甲基砷酸盐（急性剂量）添加沉积物 15 天后，组织中的砷含量达到最高值（1,172±176μg/g）。暴露于砷酸盐和砷甜菜碱的蠕虫也显著增加。形态分析表明，三甲砷氧化物是暴露于所有添加沉积物的 H. diversicolor 组织中的主要化学形态，证实了这种中间产物在砷的生物转化中的重要性。
