Partitioning of Chlorinated Paraffins (CPs) to Daphnia magna Overlaps between Restricted and in-Use Categories

Chlorinated paraffins (CPs) are high-production volume industrial chemicals consisting of n-alkanes (with 10 to 30 carbon atoms in the chain) with chlorine content from 30 to 70% of weight. In Europe, the use of short chain chlorinated paraffins (SCCPs) has been restricted by the Stockholm Conventio...

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Bibliographic Details
Published in:Environmental science & technology 2018-09, Vol.52 (17), p.9713-9721
Main Authors: Castro, Mafalda, Breitholtz, Magnus, Yuan, Bo, Athanassiadis, Ioannis, Asplund, Lillemor, Sobek, Anna
Format: Article
Language:English
Subjects:
Alkanes
Animals
Applied Environmental Science
Bioaccumulation
Carbon
Carbon cycle
Categories
Chains
Chemical compounds
Chlorination
Chlorine
Organic carbon
Organic chemistry
Organic matter
Paraffins
Partitioning
Polybutylene terephthalates
Silicones
tillämpad miljövetenskap
Weight
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Summary:Chlorinated paraffins (CPs) are high-production volume industrial chemicals consisting of n-alkanes (with 10 to 30 carbon atoms in the chain) with chlorine content from 30 to 70% of weight. In Europe, the use of short chain chlorinated paraffins (SCCPs) has been restricted by the Stockholm Convention on POPs due to their PBT (persistent, bioaccumulative and toxic) properties. Medium (MCCPs) and long chain (LCCPs) chlorinated paraffins are used as substitution products. In this work we studied the partitioning behavior of five different CP technical mixtures from the established categories (2 SCCPs, 1 MCCP, 1 LCCP and 1 CP technical mixture covering all categories) using passive dosing, by determining the partitioning coefficient of CP technical mixtures between silicone and water (K silicone‑water) as well as between organic matter and water (K oc‑water). We show that both silicone-water and organic carbon–water partition coefficients overlap between different categories of CP technical mixtures. These results indicate that in-use MCCPs and LCCPs may be equally or more bioaccumulative than restricted SCCPs. For the tested mixtures, both chlorine content and carbon chain length showed a significant correlation with both K silicone‑water and K oc‑water.
ISSN:0013-936X
1520-5851
1520-5851
DOI:10.1021/acs.est.8b00865