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Development and validation of a chronic Pb bioavailability model for the freshwater rotifer Brachionus calyciflorus.

Abstract：

:The univariate effects of Ca, pH, and dissolved organic carbon (DOC) on chronic (48-h) Pb toxicity to the freshwater rotifer Brachionus calyciflorus were investigated. High pH (8.2) and higher concentrations of DOC were protective against filtered Pb toxicity, whereas Ca was not. However, expressed as the free Pb2+ ion, Pb2+ toxicity increased with increasing DOC concentration, indicating that Pb-fulvic acid (FA) complexes may be bioavailable and may contribute to toxicity. Two different bioavailability models were developed. The pH effect was modeled as a single-site competition effect by H+ (log KHBL  = 7.14). In the first model, only this H+ effect was considered; in a second model, a log-linear fulvic acid bioavailability effect (SFA  = 0.602) was also incorporated. Both models predicted chronic Pb toxicity for most waters used for model development within a 2-fold error. To validate the predictive capacities of the models, chronic Pb toxicity to B. calyciflorus was tested in 5 natural waters and a reference water. Both models consistently underestimated Pb toxicity in the natural waters, as a result of a shift in rotifer sensitivity to Pb between the development and the validation test series. However, optimizing the intrinsic sensitivity in the models specific for the validation test series resulted in reasonable predictions of Pb toxicity in the natural waters. The second, more complex model predicted chronic Pb toxicity most accurately. The protective effects of water chemistry on Pb toxicity to Brachionus are comparable to those observed for Ceriodaphnia. However, the developed Brachionus models were not able to accurately predict chronic Pb toxicity to the rotifer Philodina rapida. It remains unclear why the influence of water chemistry on chronic Pb toxicity appears to be different between 2 rotifer species. Environ Toxicol Chem 2016;35:2977-2986. © 2016 SETAC.

journal_name

Environ Toxicol Chem

journal_title

Environmental toxicology and chemistry

authors

Nys C,Janssen CR,De Schamphelaere KA

doi

10.1002/etc.3480

subject

Has Abstract

pub_date

2016-12-01 00:00:00

pages

2977-2986

issue

12

eissn

0730-7268

issn

1552-8618

journal_volume

35

pub_type

杂志文章

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