Trace metal

About: Trace metal is a research topic. Over the lifetime, 5125 publications have been published within this topic receiving 181046 citations.

Trace Metals in Finnish Headwater Lakes — Effects of Acidification and Airborne Load

Abstract: The study on the effects of acidification and airborne load on the concentrations of some trace metals (Al, Mn, Cd, Cu, Pb, Zn, Ni, Hg) in sediments (16 lakes), water (259 lakes) and aquatic fauna (14 lakes) of pristine Finnish headwater lakes was conducted in 1985–1989. Atmospheric trace metal load and concentrations in the water and in the sediments were higher in southern Finland than in central and northern Finland. The share of anthropogenic load according to sediments varied from 62 to 95% for Cd, Hg and Pb, was from 39 to 91% for Zn and varied from 0 to 84% for Ni and Cu in southern and central Finland. Anthropogenic load could be explained by atmospheric deposition. Acid conditions favoured high concentrations of Al, Mn, Zn, Pb and Cd in water and high concentrations of Pb, Cd, Zn, Cu and Ni in aquatic plants. Lead concentrations were usually one order of magnitude higher in liver and bones of fish from acidic lakes than in circumneutral lakes. Cadmium in liver, Hg in muscle and Al in gills also showed increased concentrations in several fish species in acidic lakes.

Heavy metal accumulation in certain marine animals along the East Coast of Chennai, Tamil Nadu, India.

Abstract: (Received: August 05, 2005 ; Revised received: September 11, 2005 ; Accepted: October 29, 2005)Abstract: Heavy metals disposed through anthropogenic activities find their way into the oceans and seas through the rivers or through direct fall out fromfactory effluents. These heavy metals resuspend back into the water column along with the sediments and are known to affect the marine animals. Marineanimals like fish, prawn, crab and mussel were collected along the East Coast (off Pulicat lake to Chennai Harbour) to evaluate trace metal concentrationsin various tissues. The above specimens accumulated heavy metals such as Zn, Pb, Cu, Co, Cr, Ni and Cd. Fish, prawn, crab and mussel revealed higherconcentration of heavy metals such as Zn, Pb, Cr, Co, Cu and Ni and Cd in low levels. The results revealed that the heavy metal concentrations in the marineanimals are below the threshold levels associated with the toxicological effects and the regulatory limits. The bioconcentration factors revealed that theanimals have accumulated heavy metals along the food chain rather than from the water column and sediment.Key words:Heavy metals, Bioconcentration factor, Mussel, Prawn, Fish, CrabPDF file of full length paper is available with author

Levels and distribution of trace metals in surface sediments from Kongsfjorden, Svalbard, Norwegian Arctic

Abstract: Trace metal contents (Cd, Co, Cr, Cu, Hg, Mn, Ni, Pb and Zn) have been measured in 27 surface sediment samples collected from Kongsfjorden, Svalbard, Norwegian Arctic. The analyses yielded concentration values (in mg kg−1) of 0.13–0.63 for Cd, 11.89–21.90 for Co, 48.65–81.84 for Cr, 21.26–36.60 for Cu, 299.59–683.48 for Mn, 22.43–35.39 for Ni, 10.68–36.59 for Pb, 50.28–199.07 for Zn and 8.09–65.34 for Hg (in ng g−1), respectively. Relative cumulative frequency method has been used to define the baseline values of these metals, which (in mg kg−1) were 0.14 for Cd, 13.56 for Co, 57.86 for Cr, 25.14 for Cu, 364.08 for Mn, 26.22 for Ni, 17.46 for Pb, 70.49 for Zn and 9.76 for Hg (in ng g−1), respectively. The enrichment factor analysis indicated that Hg showed some extent of anthropogenic pollution, while Pb, Zn and Cd showed limited anthropogenic contamination in the study areas.

Trace metals in a tropical river environment-distribution

Abstract: Distribution of trace metals in the Periyar river has been investigated in detail. The fluvial concentrations of trace metals increase in river water and decrease in sediments during the summer months due to solubilization and concentration by evaporation. The levels, especially of Zn and Cd which are industrial pollutants increase by a factor of 10 both in water and sediments at the industrial zone. The concentration of Cd in the river water approaches the WHO standards for safe limits in drinking water. Solubilization at the backwater zone under high salinity is identified as one of the major mechanisms of trace metal transport to the marine environment. River meandering is responsible for large scale deposition of suspended solids at the industrial zone during the monsoon period. The trace metals exhibit build-up in specific concentration in the suspended solids in proportion to their residence time.