State Key Laboratory of Marine Environmental Science, College of Environment and Ecology, Xiamen University, Xiamen 361005, China.
Environ Sci Technol. 2013 Jul 2;47(13):7499-505. doi: 10.1021/es401112d. Epub 2013 Jun 14.
A suitable test organism for assessing the bioavailability of sediment-bound metals should accumulate metals mainly from the sediment instead of other sources such as water. The deposit-feeding sipunculan worms, which indiscriminately ingest sediment particles and have a very low uptake rate of dissolved metals, appear to be such good candidates. The worms have additional advantage due to simple anatomy and are like little sacs full of liquid, that is, coelomic fluid, which can be easily collected for metal analysis after simple sample treatment. We measured the metal concentrations in a sipunculan worm, Phascolosoma arcuatum and in sediments collected from intertidal zones of Xiamen City, China. Significant correlations were found for the concentrations of chromium, nickel, copper, zinc, cadmium, and lead in sediments and their concentrations in both somatic tissue and coelomic fluid of the worms. Analyzing the metals in coelomic fluid led to similar results as the somatic-tissue metals for assessing the bioavailability of sediment-bound metals and the spatial pattern of sediment-bound metal contamination. Therefore, measuring coelomic-fluid metal concentrations can be used to provide a rapid assessment of metal bioavailability in marine sediments.
用于评估沉积物中金属生物有效性的合适测试生物应该主要从沉积物中积累金属，而不是从水等其他来源中积累。食沉积物的星虫，它们不加区分地摄取沉积物颗粒，并且对溶解态金属的摄取率非常低，似乎是很好的候选生物。这些虫子还有其他优点，因为它们的解剖结构简单，就像装满液体的小袋子，也就是体腔液，经过简单的样品处理后，可以很容易地收集这些体腔液用于金属分析。我们测量了中国厦门市潮间带采集的星虫 Phascolosoma arcuatum 和沉积物中的金属浓度。发现沉积物中铬、镍、铜、锌、镉和铅的浓度与其在虫子的体组织和体腔液中的浓度之间存在显著相关性。分析体腔液中的金属与分析体组织中的金属一样，可以用于评估沉积物中结合态金属的生物有效性和沉积物中结合态金属污染的空间模式。因此，测量体腔液中的金属浓度可以用于快速评估海洋沉积物中金属的生物有效性。
