Abstract:
:Most laboratory assessments of toxicity and bioaccumulation of heavy metals have been concentrated on the accumulation of these metal ions when exposed singly to the test organisms. However, under the natural environmental settings, the metals are never present in isolation and may interact with each other, therefore justifying the need to study the influence of joint application of metals on accumulated levels in exposed animals. In this study, exposure of the periwinkle Tympanotonus fuscatus to sublethal concentrations (equivalent to 0.1 and 0.01 of 96 h LC50) of heavy metals revealed that they were bioaccumulative varying amounts, depending on the type of metal, exposure period and concentration in the test media. While Zn and Pb ion accumulation increased steadily with exposure time, the amounts of Cu accumulated fluctuated regularly over the 30-day experimental period. The levels of Zn, Cu and Cd bioaccumulated over the 30-day experimental period were reduced by over 2-6 folds (with bioaccumulation ratio values ranging from 0.15 to 0.81) when compared to concentrations of the respective metals accumulated during single bioaccumulation studies. However, Pb concentrations accumulated during the joint action studies increased nearly 2-fold (bioaccumulation ratio range 1.36 to 2.0-fold).
journal_name
Rev Biol Tropjournal_title
Revista de biologia tropicalauthors
Otitoloju AA,Don-Pedro KNdoi
10.15517/rbt.v54i3.12791subject
Has Abstractpub_date
2006-09-01 00:00:00pages
803-14issue
3eissn
0034-7744issn
2215-2075journal_volume
54pub_type
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journal_title:Revista de biologia tropical
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journal_title:Revista de biologia tropical
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journal_title:Revista de biologia tropical
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journal_title:Revista de biologia tropical
pub_type: 杂志文章,评审
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pub_type: 评论,信件
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更新日期:2016-06-01 00:00:00