this study was conducted to determine the residues of mercury (hg), lead (pb), copper (cu) and cadmium (cd) in the imported tilapia fillets. thirty random samples from imported tilapia fillets were collected from different markets in isfahan city, central iran. they were analyzed using graphite furnace atomic absorption spectrometer (perkin elmer 800) for pb, cu, cd and flow injection mercury s...

a study was carried out in malawi to determine the levels of heavy metals in cabbages grown in gardens irrigated with reservoir and tap water. the concentrations of cadmium, lead and chromium were determined in the leaf and in the corresponding soils in order to assess whether the amounts in the soils reflected the accumulation of heavy metals in plants. the results showed that the levels of th...

Pollution of the soil environment with toxic materials from fossil burning, mining and smelting of metalliferous ores, disposal of sewage, fertilizers and pesticides, etc. has increased dramatically since the onset of industrial revolution. Various strategies including bioremediation and phytoremediation are employed to remove heavy metals from such soils and making them available for agricultu...

The heavy metals chiefly include Pb, Hg, Cd, Cr, Cu, Zn, Mn, Ni, Ag, etc. The heavy metals, viz., As, Cd, Pb and Hg are considered most toxic to humans, animals, fishes and environment. Excessive concentrations of heavy metals are detrimental. They destabilize ecosystems because of their bioaccumulation in organisms, and toxic effects on biota and even death in most living beings. All heavy met...

background : heavy metals and pah s in flue gas have received considerable attention in recent years due to their mutagenic or carcinogenic properties. pah s are products of incomplete combustion of carbonaceous compounds at high temperatures. heavy metals are released into the ambient air from the same sources as those earlier mentioned for pah s . the present study was carried out to investig...

Heavy metals contamination of soil is a widespread global problem. Chelant assisted phytoextraction has been proposed to improve the efficiency of phytoextraction which involves three subsequent levels: transfer of metals from the bulk soil to the root surfaces, uptake into the roots and translocation to the shoots. However, most studies focused on the first level. A hydroponic experiment, whic...

Heavy metals in textile wastewater represent a major environmental problem, and are a potential danger to human health when present on textiles. Furthermore, the presence of some metals influences the production of textiles. Heavy metals are often used as oxidizing agents, as metal complex dyes, dye stripping agents, fastness improvers, and finishers. Thus, they act as hazardous sources through...

Ralstonia (Wautersia, Cupriavidus) metallidurans (Rme) is better able to withstand high concentrations of heavy metals than any other well-studied organism. This fact renders it a potential agent of bioremediation as well as an ideal model organism for understanding metal resistance phenotypes. We have analysed the genome of Rme for genes encoding homologues of established and putative transpor...

An important concern for human health is the uptake of contaminants by plants from soil and their consumption by humans. The concentrations of heavy metals (lead, copper, cadmium) in the soil and plant samples collected from a village near sedimentation ponds, north-western Romania have been determined by inductively coupled plasma atomic emission spectrometry after aqua regia digestion and by ...