Abstract
Treatment of Hg contaminated fish by addition of Se (the Boliden SRM-method) has been shown to be an effective mean to reduce the Hg concentration of pike and perch. The fullscale tests in eleven lakes in Sweden have confirmed the earlier results in lake Oltertjarn in Sweden. The 1 yr old perch in the treated lakes shows a reduction in the mean Hg concentration. The Hg concentration in tissue varied between 0.04 and 0.29 mg kg in the different lakes before treatment. After treatment the Hg concentration decreased to 0.02 to 0.07 mg kg−1. The reduction in perch was as much as 60% for the three lakes with lower background concentration in pike (less than 0.7 mg kg−1) and as high as 85% for eight lakes with higher concentrations. In pike with Hg concentration at or above 1 mg kg−1it was reduced by 22% after only I yr and by 28% after 2 yr of treatment. Experience gained in these tests verifies the importance of adjusting the dose and addition period to the lake. Good circulation in the lake is essential during addition.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
