Inhibition effect of Na+ and Ca2+ on the bioaccumulation of perfluoroalkyl substances by Daphnia magna in the presence of protein. (6th January 2015)

• Record Type: Journal Article
• Authors: Xia, Xinghui; Rabearisoa, Andry Harinaina; Dai, Zhineng; Jiang, Xiaoman; Zhao, Pujun; Wang, Haotian
• Is Part Of: Environmental toxicology and chemistry. Volume 34:Number 2(2015:Feb.)
• Page Start: 429
• Page End: 436
• Publication Date: 2015-01-06
• Subjects: Pollution -- Environmental aspects -- Periodicals; Environmental chemistry -- Periodicals; 615.902
• DOI: 10.1002/etc.2823
• Languages: English
• ISSNs: 0730-7268

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <sec id="etc2823-sec-0001" sec-type="section"> <p>The authors investigated the individual effects of Ca<sup>2+</sup> and Na<sup>+</sup> on the bioaccumulation of 6 types of perfluoroalkyl substances (PFASs), including perfluorooctane sulfonate (PFOS), perfluorooctanoic acid (PFOA), perfluorononanoic acid (PFNA), perfluorodecanoic acid (PFDA), perfluoroundecanoic acid (PFUnA), and perfluorododecanoic acid (PFDoA), by <italic>Daphnia magna</italic> in water with 10 mg L<sup>−1</sup> bovine albumin or soy peptone. The bioaccumulation factors of PFASs by <italic>D. magna</italic> decreased linearly with the increase of Ca<sup>2+</sup> and Na<sup>+</sup> concentrations. The inhibition effect of Ca<sup>2+</sup> was stronger than that of Na<sup>+</sup>, and the decreasing percentages of the body burden of PFASs in <italic>D. magna</italic> caused by the increment of 1 mmol L<sup>−1</sup> Ca<sup>2+</sup> and 1 mmol L<sup>−1</sup> Na<sup>+</sup> were 41% to approximately 48% and 2% to approximately 5%, respectively, in the presence of soy peptone. The partition coefficients (<italic>K</italic><sub>p</sub>) of PFASs between protein and water increased with rising Ca<sup>2+</sup> and Na<sup>+</sup> concentrations. The elevated <italic>K</italic><sub>p</sub> values led to the reduced concentrations of freely dissolved PFASs. This resulted in a decrease of PFAS bioaccumulation in <italic>D. magna</italic>, and the body burden of each PFAS was positively correlated with its freely dissolved concentration in water. The present study suggests that cations should be considered in the assessment of bioavailability and risk of PFASs in natural waters containing proteinaceous compounds. <italic>Environ Toxicol Chem</italic> 2014;9999:1–8. © 2014 SETAC</p> </sec> </abstract>