Geochemistry of mercury in sediments from Lake Biwa in Japan

Chandrajith, Rohana; Okumura, Minoru

doi:10.1111/j.1440-1770.1996.tb00063.x

Cited by 5 publications

(2 citation statements)

References 16 publications

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“…Data and reports on the presence and sources of hazardous chemicals in surface waters in other areas (Chandrajith & Okumura 1996; Shitsama 1999; Farkas et al. 2000; Kishe & Machiwa 2003, 2005; Wejuli et al.…”

Section: Introductionmentioning

confidence: 99%

Trace metal concentration in water and sediments of satellite lakes within Lake Victoria (Kenya) basin

Mwamburi¹

2009

Lakes & Reservoirs

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Lakes Kanyaboli, Sare and Namboyo are three important freshwater satellite lakes in the northern region of the Lake Victoria (Kenya) basin. Lake Simbi, a small alkaline -saline crater-lake is located near the southern shoreline of the Nyanza Gulf of Lake Victoria. The three freshwater lakes provide unique aquatic habitats for the important indigenous fish species and other aquatic biodiversity, as well as serving as water resources for the surrounding communities. Surface and sediment samples were collected and examined to characterize these lake systems. Metal partitioning among the various defined geochemical phases also was determined. Based on the measured concentrations, the satellite lake waters are relatively uncontaminated with regard to Al (aluminium), manganese (Mn), zinc (Zn), copper (Cu) and chromium (Cr). Levels of most elements were below detection limits, as well as being well below the desirable drinking water guideline values proposed by the World Health Organization. The exception was the elevated iron (Fe) contents (>300 lg L )1 ). The sediments exhibited a relatively low level of contamination with regard to heavy metals. The mean values of the measured metals in the sediments were compared to levels in adjacent Lake Victoria. The study results from these poorly-studied, and relatively unperturbed ecosystems, compared to the main body of lake Victoria, highlight their importance as conservation areas, despite the small-scale fishery activity, potential threats from human activities and their sensitivity to fluctuating environmental conditions.

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Section: Introductionmentioning

confidence: 99%

Trace metal concentration in water and sediments of satellite lakes within Lake Victoria (Kenya) basin

Mwamburi¹

2009

Lakes & Reservoirs

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“…A dated sediment core obtained from Lake Jinzai in northwest Japan show a similar Hg depth profile, where the highest concentration was found to be deposited in 1960s (Chandrajith et al 1995). The maximum concentration of Hg in sediments from both lakes is lower than that of some other lakes in Japan, such as Lake Jinzai (303 ng g –1 ; Chandrajith et al 1995), Lake Inwashiro (479 ng g –1 ) and Lake Biwa (221 ng g –1 ; Chandrajith 1994). Mercury in lakes Shinji and Nakaumi is believed to be derived from diffuse sources, such as run‐off from agricultural land, because of the absence of industries that use Hg in the vicinity of the drainage basins for the two lakes.…”

Section: Resultsmentioning

confidence: 72%

Record of mercury pollution in sediments of lakes Nakaumi and Shinji in Japan

2001

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Two sediment core profiles from lakes Shinji and Nakaumi were studied in order to understand the level of mercury (Hg) pollution in lakes in northwestern Japan. The sedimentation rates were established on the basis of the activity of [210Pb] and [131Cs] in the sediments. In Lake Shinji, the highest level of Hg (130 ng g–1) in the sediment was found at a depth of 20–22 cm, while 195 ng g–1 was found at a depth of 10–12 cm in the core profiles from Lake Nakaumi. The relative increase in Hg concentration in lake sediments started after 1960 and significant contamination events occurred in the early 1960s. Mercury profiles in lake sediments from lakes Shinji and Nakaumi are found to reflect the anthropogenic Hg released into the environment in the 1950s and 1960s. A pronounced maximun concentration of Hg is found in both lakes, where sediment accumulation rates differ.

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