Occurrence of heavy metals in the sediments of Uranouchi Inlet,Kochi prefecture,Japan |
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Authors: | De Jaysankar Kimio Fukami Kozo Iwasaki Kei Okamura |
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Institution: | (1) Graduate School of Kuroshio Science (GRAKUS), Kochi University, B200 Monobe, Nankoku Kochi, 783-8502, Japan;(2) Faculty of Agriculture, Kochi University, B200 Monobe, Nankoku Kochi, 783-8502, Japan;(3) Center for Advanced Marine Core Research, Kochi University, Nankoku, Kochi 783-8502, Japan;(4) Present address: Vanevan Institute, 14 Yerevanyan Street, Martuni, Gegharkunik, Armenia |
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Abstract: | The present status of contamination by heavy metals, and the impact of cage culture on sediments at the Uranouchi Inlet, Kochi
Prefecture, Japan, were investigated from two stations influenced by intensive aquaculture and a control station, during May–July
2006. The moisture content of the sediments at the aquaculture stations was over 65%, and the organic matter was always over
100 mg/g dry wt. In contrast, the highest moisture content and organic matter at the control station was 45.5% and 62.9 mg/g dry wt,
respectively. Concentrations of zinc (Zn) (178 ± 4.8 mg/kg dry wt) and copper (Cu) (125 ± 1.2 mg/kg dry wt) were highest at
the aquaculture stations. Lead (Pb) was highest (50.7 ± 0.77 mg/kg dry wt) at the aquaculture station though it was as high
as 33.2 ± 0.77 mg/kg dry wt at the control station. One-way ANOVA showed that the differences in concentrations of Zn and
Cu in sediments from the aquaculture and control stations were highly significant (P = 0.01), whereas Pb showed no such trend. Occurrence of a large fraction of labile Zn (56.1%) and Cu (40.3%) in these sediments
warrants attention. Although factors other than metals may explain the distribution observed, the information presented here
may be useful in predicting long-term effects of heavy metal contamination from aquaculture in the marine environment. |
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Keywords: | Aquaculture Copper Labile metals Lead Uranouchi Inlet Zinc |
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