Heavy Metal Content Study in River Sediments in Traditional Gold Mining Locations, Boto Village, Jatiroto District
Abstract
Traditional and small-scale gold mining, known as ASGM (Small Scale Gold Mining), has been approved for
pollution of the environment specifically for watersheds. This research was conducted in Boto Village,
Jatiroto Subdistrict, Wonogiri Regency, Central Java Province. This study discusses the analysis of
composition and heavy metals and the factors that support heavy metals in the study site. The samples
taken were 22 samples along the river flow in the upstream and downstream areas. Tests of content were
not carried out by the ICP-AES method. Laboratory test results on river sediment samples were then
analyzed statistically, geoaccumulation index and enrichment factors were calculated. Laboratory test results
show that most do not have heavy metal content exceeding the average concentration of heavy metals in
river sediments. The spread of heavy metals in river sediments in the study sites was found to be varied with
differences in the upstream and downstream areas. In general, upstream areas have higher metal reserves
compared to downstream. Distribution of heavy metals for everything that has not been planned, is
processed by natural processes or human activities. Traditional mining activities contribute significantly in
contributing to the addition of Hg, as well as contributing to the increase of other metals, most of which are in
the mineralized area, which fully contains high metal reserves.
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