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Abstract This paper provides an evaluation of heavy metals in Lake Maninjau's waters and sediments, as well as the resultant pollution index value. In all areas, the Hg metal in sediments met the quality requirements of contaminated soil in all areas. Heavy metals in sediment are more concentrated than those of heavy metals in water. 8 of 11 sampling locations were in the medium polluted category, with the fish cage location having the highest pollution index value. Aquaculture, water transportation, and settlements around the lake all have an effect on the lake's waters and sediments, which have been characterised by heavy metal contamination. The lake's quality must be consistently monitored, and wastewater treatment must be improved from activities around the lake to minimize heavy metal pollution. Further investigation is required into the heavy metals contamination originating from anthropogenic activities and natural sources.
Source link: https://doi.org/10.1088/1757-899x/1041/1/012031
Five core samples were collected, including a reference sample from Jauá Lake and one from a small lake near the deposition site, including a reference site and one from a small lake near the deposition site. As a whole, metal concentrations on the upper layer of sediments were higher than those on lower ones. Concentrations from the reference site were similar to those from the other Jauá Lake locations. The absolute values of most metals in the Dunas Lake sediments, which are located near the contamination site, were higher than in any other stations. The theory, that:: soilwater contamination could contaminate the soil, would be contaminated, would persist; and there would be a gradient of decreasing contamination from sites near the residue deposit to sites further away, was dismissed. Future research is required to investigate metal levels in plants and the role of plants in metal bioavailability, and metal bioavailability of plants.
Source link: https://doi.org/10.1080/14634980008650687
In bulk sediment samples obtained from a highly polluted reservoir, Billings, S. o. , showed enrichment factors from 2. 4 to 30 fold, compared to two other water bodies in the study, Barra Bonita Reservoir and Diogo Lake. When Hyalella azteca and Ceriodaphnia dubia were exposed to Billings reservoir sediment, the highest mortality rates occurred. In the case of sediment oxidation, laboratory microcosms demonstrated rises in the less abundant fraction of metals in sediments from Billings Reservoir, Diogo Lake, and Barra Bonita Reservoir, after forty-eight days of sediment oxidation. Chironomus xanthus was not affected by toxicity in sediment from any of the three environments. Ceriodaphnia dubia was sensitive to persistent toxicity in bulk field sediments from all three locations, and it revealed an increase in mortality rate in tests with oxidized sediment. In Diogo Lake sediment, 30 percent mortality was recorded in field or pre-aeration sediments, up to 60% in post aeration sediments.
Source link: https://doi.org/10.1080/14634980500234735
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