AI Article Synopsis
- The Leibniz Institute for Baltic Sea Research is monitoring harmful substances, specifically the isomers of hexachlorocyclohexane (HCH), in the Baltic Sea in line with HELCOM commitments.
- After WWII, HCH compounds were widely used as insecticides, with γ-HCH being the most effective, resulting in their even distribution across the Baltic Sea.
- Monitoring data from 1975 to 2015 show a significant decrease in HCH levels, with β-HCH currently being the most common isomer and having the longest environmental persistence.
Article Abstract
In response to the HELCOM commitment the Leibniz Institute for Baltic Sea Research Warnemuende conducts a monitoring program on listed substances of concern for the Baltic Sea environment which comprises the isomers of technical hexachlorocyclohexane (HCH). After World War II the HCH compounds were applied globally in huge amounts as insecticidal formulation in which only γ-HCH is the effective agent. Monitoring was conducted in water samples from a large Baltic Sea area. Mostly, the HCH compounds were evenly distributed in the Baltic Sea. Data from 1975 to 2015 from the Arkona Basin depict a substantial reduction of the HCH pressure (12,500 to < 400 pg/L). Longest residence is shown for β-HCH, which is currently the predominant HCH isomer in the Baltic Sea (α/β/γ:1/2/1). Half lives were determined to be 4-8 years for α- and γ-HCH and 5-20 years for β-HCH.
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| http://dx.doi.org/10.1016/j.chemosphere.2016.11.123 | DOI Listing |
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