Contents and correlationship of heavy metals in Phascolosoma esculentas and their habitat sediments
可口革囊星虫与其栖息地底泥中的重金属含量及相关性分析

Elemental contents of heavy metals Zn, Cu, Mn, Fe, Cd, Pb, Hg, and As in Phascolosoma esculentas and habitat sediments collected from seashore bottomlands of Beihai, Ningde, Xiamen, Yueqing, Taizhou and Wenling and culture area of Wenling were determined by AAS and AFS. Heavy metal contents, the correlativity between P. esculentas and habitat sediments and the biological concentration factor (BCF) were analyzed on the basis of the above data. The results showed a significant difference of heavy metal contents in P. esculentas from different sites (P<0.05). Lead concentrations in P. esculentas from all the sampling sites and Cd from Xiamen were above the security standards. The heavy metals contents in the sediments from Xiamen, Yueqing and culture area of Wenling were relatively high. The content of Cu in sediments from all the sampling sites and Zn from culture area of Wenling were up to the second-class quality standard for marine sediments, while the others reached the first-class standard. The BCFs of Zn, Cu and Fe were less than one; whereas the BCFs of Mn, Cd, Pb, Hg and As were higher than one. The BCFs of Zn, Cu, Fe, Pb and As have no significant variation among most of sampling sites. A most positive correlation was observed for the Fe and As levels in muscle and that in the sediments, closely followed by Zn and Hg, while others elements presented faint-correlation or non-correlation.