Dechloranes in lichens from the southeast Tibetan Plateau: Evidence of long-range atmospheric transport

Abstract

h i g h l i g h t s• The occurrence and distribution of Dechloranes were investigated in the southeast Tibetan Plateau (TP).• DP concentration in southeast TP was much higher than those in moss from the Arctic region.• Different altitudinal patterns between DP and Dec 602 were identified.• Decs are prone to undergo LRAT and cold-trapping by the mountains in the southeast TP. a r t i c l e i n f o t r a c tDechloranes (Decs) have been recently found to occur widely in the environment even in the remote polar regions. However, the understanding of their environmental fate is rather limited. The Tibetan Plateau (TP) may be an important indicator region to study the long-range atmospheric transport and their fates of these emerging contaminants since it has very limited local sources. In the present study, Dechlorane plus (DP), Dechlorane 602 (Dec 602), Dechlorane 603 (Dec 603) and Dechlorane 604 (Dec 604) were analyzed in lichen samples from the southeast TP. The results showed that only DP and Dec 602 were detected, with a detection frequency of 89% and 100%, respectively. The average concentrations (dry weight) of DP and Dec 602 were 318 pg g −1 (20-1132 pg g −1 ) and 167 pg g −1 (27-843 pg g −1 ), respectively. The DP concentration in this study was much higher than those in moss from the remote Ny-Ålesund, Arctic. The concentrations of Dec 602 were found to generally increase with increasing altitude, while DP concentrations seemingly showed an opposite altitudinal trend along the mountain slopes. No stereoselective accumulation or transformation of anti-DP and syn-DP was observed in lichens and the altitudinal behavior of the two isomers was similar. This research documented that Decs are prone to undergo LRAT and cold-trapping by the mountains in the southeast TP.

Validation and Application of a 3-Step Sequential Extraction Method to Investigate the Fraction Transformation of Organic Pollutants in Aging Soils: A Case Study of Dechlorane Plus

“…This result might explain previous studies that had revealed stereoselective enrichment of syn-DP in some terrestrial organisms, for example, eucalyptus foliage, pine needles, and lichens. 56−58 Recent studies also indicated that DP is genotoxic to bacteria and earthworms, suggesting that the subchronic toxicities of DP to terrestrial organisms deserved more attention 54,58 and the effect of fraction transformation on stereoselective enrichment of DP should be considered.…”

Global Atmospheric Concentrations of Brominated and Chlorinated Flame Retardants and Organophosphate Esters

“…In the case of HBCD, this has led to its addition to the Stockholm Convention in 2013 for elimination with restricted uses . These alternative FRs are also detected regularly in geographically remote regions (such as polar regions), indicating a potential to undergo long-range atmospheric transport, ,− and as such, more extensive global monitoring data is needed on these chemicals of concern.…”

Occurrence of Dechlorane Plus and related compounds in catfish (Silurus spp.) from rivers in France

“…At the same time, alternative DRCs based on hexachlorocyclopentadiene as well, such as Dechlorane-601, -602, -603 (Dec-601 to Dec-603) and Chlordene Plus (CP), were also placed on the market (Table S1). Little information however is available on the production volumes for these alternative DRCs (Yang et al, 2016). We did not find any information about the use or import of Dec-601, Dec-602, Dec-603 and CP in France.…”