Faculty of Agriculture, Ehime University, Tarumi 3-5-7, Matsuyama, Ehime 790-8566, Japan.
Mar Pollut Bull. 2011;63(5-12):124-34. doi: 10.1016/j.marpolbul.2011.03.002. Epub 2011 Apr 16.
We performed stable carbon and nitrogen-guided analyses of biomagnification profiles of arsenic (As) species, including total As, lipid-soluble As, eight water-soluble As compounds (arsenobetaine (AB), arsenocholine (AC), tetramethylarsonium ion (TETRA), trimethylarsine oxide (TMAO), dimethylarsinic acid (DMA), monomethylarsonic acid (MMA), arsenate (As[V]), and arsenite (As[III])), and non-extracted As in a tropical mangrove ecosystem in the Ba Ria Vung Tau, South Vietnam. Arsenobetaine was the predominant As species (65-96% of water-soluble As). Simple linear regression slopes of log-transformed concentrations of total As, As fractions or individual As compounds on stable nitrogen isotopic ratio (δ15N) values are regarded as indices of biomagnification. In this ecosystem, lipid-soluble As (slope, 0.130) and AB (slope, 0.108) were significantly biomagnified through the food web; total As and other water-soluble As compounds were not. To our knowledge, this is one of the first reports on biomagnification profiles of As compounds from a tropical mangrove ecosystem.
我们对砷（As）物种的生物放大谱进行了稳定的碳和氮导向分析，包括总砷、脂溶性砷、八种水溶性砷化合物（砷甜菜碱（AB）、砷胆碱（AC）、四甲基砷离子（TETRA）、三甲基氧化砷（TMAO）、二甲基砷酸（DMA）、一甲基砷酸（MMA）、砷酸盐（As[V]）和亚砷酸盐（As[III]））以及越南南部巴地头顿省热带红树林生态系统中的非提取砷。砷甜菜碱是主要的砷物种（水溶性砷的 65-96%）。总砷、砷分数或个别砷化合物的对数浓度与稳定氮同位素比值（δ15N）值的简单线性回归斜率被视为生物放大的指标。在这个生态系统中，脂溶性砷（斜率为 0.130）和 AB（斜率为 0.108）通过食物网明显被生物放大；总砷和其他水溶性砷化合物则没有。据我们所知，这是关于热带红树林生态系统中砷化合物生物放大谱的首批报告之一。
