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• W2048748571 abstract "Abstract Various extraction methods have been developed to assess metal bioavailability from sediments. In this study, we compared the extraction of Cd, Cr, and Zn from contaminated sediments using different extractants (normal seawater, acidic seawater of pH = 5, seawater with 1% sodium dodecyl sulfate [SDS], and gut digestive fluids collected in vitro from deposit‐feeding peanut worm Sipunculus nudus ) coupled with concurrent metal speciation measurements. The influences of sediment aging on metal extraction were also examined using radiotracer‐spiked techniques. Sediments aging up to 100 d did not significantly affect the partitioning of spiked Cd and Cr in different geochemical phases, but the spiked Zn was partitioned more into the reducible fraction and less into the carbonate phase with increasing sediment aging. There was a major difference in the partitioning into different geochemical phases between the spiked metals and the native metals within the 100‐d sediment aging. The difference between the spiked and native Cd and Zn extraction using gut juices was somewhat smaller than the strong geochemical contrast. Metals bound with the anoxic sediments were hardly extracted by different extractants. There was a significant relationship between the extraction of spiked Cd and its distribution in the exchangeable phase (positive correlation) or in the reducible phase (negative correlation). For Cr and Zn, extraction was not correlated with their partitioning in any of the geochemical phases. Further, extraction of all three metals by digestive gut fluids was not correlated with the concentrations of simultaneously extractable metals (SEM), nor with the difference between SEM and acid volatile sulfide (AVS). Our study suggests that there were large differences in extraction among metals using different extractants and only Cd extraction was significantly related to its geochemical speciation in sediments." @default.
• W2048748571 created "2016-06-24" @default.
• W2048748571 creator A5045680818 @default.
• W2048748571 creator A5066308891 @default.
• W2048748571 date "2003-11-01" @default.
• W2048748571 modified "2023-10-17" @default.
• W2048748571 title "EXTRACTION OF SPIKED METALS FROM CONTAMINATED COASTAL SEDIMENTS: A COMPARISON OF DIFFERENT METHODS" @default.
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• W2048748571 doi "https://doi.org/10.1897/02-449" @default.
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