Urgent caution to trace organometal pollution: Occurrence, distribution and sources of methyltins, butyltins and phenyltins in sediments from South Hangzhou Bay, China

Document Type

Article

Publication Date

3-1-2019

Abstract

The concentrations of seven organotin compounds (OTCs) were determined seasonally in 22 sediment samples (brackish, freshwater and shrimp pond sediments) in South Hangzhou Bay, China. For the brackish and freshwater sediments, methyltins of up to 43.0 ng Sn g−1 dw showed no significant variation with seasons or locations (p > 0.05). However, butyltin levels in summer (44.0 ± 30.2 ng Sn g−1 dw) were about two folds higher than those in spring (20.4 ± 18.7 ng Sn g−1 dw) and four folds higher than in autumn or winter (both≈10 ng Sn g−1 dw), which is mainly attributed to the heavy contamination near the shipyard, mariculture and textile plants in summer. Phenyltins in spring reached the peak level of 28.4 ng Sn g−1 dw, about three times of other seasons. Meanwhile, there was a significant variation of phenyltins in summer with high-value sites also in the vicinity of mariculture. Thus, excepting the contribution of agricultural activities to phenyltins, mariculture is likely to be a potential source of butyltins and phenyltins into the marine environment (particularly in summer). This hypothesis has been partly validated by determining adjacent shrimp pond sediments, which showed ubiquitous contamination of butyltins and phenyltins in summer and spring (14.2–44.2 ng Sn g−1 dw and 2.2–16.9 ng Sn g−1 dw), but only one sample had the detectable methyltin levels with 8.8 ng Sn g−1 dw of momomethyl-tin. On the other hand, seven OTCs showed a stronger affinity to brackish sediments than the adjacent freshwater sediments, probably owing to the differences of physicochemical parameters and microbial activities in sediments. Overall, OTC contaminants have become more diversified and complicated in coastal zones, suggesting that future studies should pay attention to other OTC species like phenyltins and methyltins, not only the butyltins.

Identifier

85059128727 (Scopus)

Publication Title

Environmental Pollution

External Full Text Location

https://doi.org/10.1016/j.envpol.2018.12.037

e-ISSN

18736424

ISSN

02697491

PubMed ID

30597389

First Page

571

Last Page

577

Volume

246

Grant

2017ZX07201002

Fund Ref

Major Science and Technology Program for Water Pollution Control and Treatment

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