2024-03-29T11:44:27Z
https://repository.dl.itc.u-tokyo.ac.jp/oai
oai:repository.dl.itc.u-tokyo.ac.jp:00040834
2022-12-19T04:16:26Z
40:6494:7162:7206:7210
9:504:7165:7208:7211
Artisanal gold mining related mercury pollution in Ratatotok area of North Sulawesi, Indonesia
Daniel, Limbong
139734
Jeims, Kumampung
139735
Dansho, Ayhuan
139736
Arai, Takaomi
139737
Miyazaki, Nobuyuki
139738
452
mercury
artisanal gold mine
bioaccumulation
Indonesia
application/pdf
Gold mining in the Ratatotok area has a long history going back to the activity of a Dutch company, Nederland Mynbouw Maschapai in the years 1887 to 1922. After about 60 years latter, artisanal or small groups of local community started to seek their fortune in the gold mining using techniques learned from the Dutch company, consisting of gold vein tunnels and mercury amalgamation processing. In the 1990s an American company, PT. Newmont Minahasa Raya obtained a gold mining concession in a part of this area. This company uses advanced technologies such as open pit mining, cyanidation processing, detoxification of sludge, and a sub-marine tailing system. While the problems of mercury emissions from artisanal gold mining have been well studied in much of the world, little has been written about the state of mercury pollution in this area. It is vital to understand how the situation has affected the surrounding aquatic environment, because fish is the main protein source and income for the local community. This study has been carried out with aims of determing the influence of mercury emissions from artisanal gold mining activity upon the surrounding aquatic environment. Research included total mercury determination in water, sediment, and fish samples taken along the impacted Totok River. Total mercury determinations were accomplished using an atomic absorption spectrophotometer employing cold vapor generation. As a result, high concentrations of mercury in sediment and fish meat has been noted. The water samples showed only small amounts of mercury. In sediment, mercury contents were seen to increase at deeper layers, reaching up 40mg/kg dry weight. The analysis of fish meat samples showed that the mercury the range from 0.08 mg/kg in pelagic fish to 0.89 mg/kg in bivalve. The present findings demonstrate that a more comprehensive monitoring of the presence of mercury in fish taken in the area of Totok Bay in order to better mitigate this problem.
departmental bulletin paper
International Coastal Research Center, Ocean Research Institute, the University of Tokyo
2004-04-30
application/pdf
Coastal marine science
1
29
69
74
AA11957899
13493000
https://repository.dl.itc.u-tokyo.ac.jp/record/40834/files/KJ00004098942.pdf
eng