Polycyclic Hydrocarbons Vol. 1. Pp. xxvi + 487. 126S. (With a chapter on carcinogenesis by Regina Schoental.) Vol. 2. Pp. lvii + 487. 140s. By E. Clar. (London and New York: Academic Press; Berlin: Springer-Verlag, 1964.)

Polycyclic Aromatic Hydrocarbons

Heavy metals in soils

Geochemical speciation and risk assessment of heavy metals in the river estuarine sediments--a case study: Mahanadi basin, India.

The pollution of rivers and lakes is of concern because of the threat to public water supplied and because of the damage caused to natural ecosystems. Waterborne diseases remain rife in the Third World, while in developed countries there has been a decline in the quality of water. It has also become apparent that pollutants may destroy ecosystems hundreds of miles from their source. Some of these toxic materials such as lead and PCBs also pose threats to public health. This text describes the sources of various types of pollutants, their effects on aquatic organisms, ecosystems and man, using case histories where appropriate. Ways of mitigating the effects of pollutants by control and ecosystem manipulation are described. Techniques for assessing the effects of pollution, both in field and laboratory, are introduced. The role of the biologist in pollution assessment and control and in the wider sphere of mangement of acquatic resources is also examined.

Biology of Freshwater Pollution.

A comprehensive review of the single and sequential extraction schemes for metal fractionation in environmental samples such as soil and industrially contaminated soils, sewage sludge and sludge amended soils, road dust and run off, waste and miscellaneous materials along with other approaches of sequential extraction methods are being presented. A discussion on the application of chemometric methods in sequential extraction analysis is also being given. The study of single and sequential extraction methods for various reference materials are also being looked into. The review covers several aspects of the single and sequential extraction methodologies. The use of each reagents involved in these schemes are also discussed briefly. Finally the present upto date information by different workers in various fields of environmental geochemistry along with the possible future developments are also being outlined.

A Review of the Different Methods Applied in Environmental Geochemistry For Single and Sequential Extraction of Trace Elements in Soils and Related Materials

Trace heavy metals composition of some Nigerian beverages and food drinks

The concentrations of iron (Fe), copper (Cu), zinc (Zn), nickel (Ni), manganese (Mn), cadmium (Cd), lead (Pb) and chromium (Cr) in chicken meat, chicken gizzard and turkey meat consumed in southern Nigeria were determined after nitric acid/perchloric acid digestion using graphite furnace atomic absorption spectrophotometry. The order of the elements in the chicken meat, chicken gizzard and turkey meat was as followed: Fe>Zn>Ni>Cu>Cr>Pb>Cd>Mn. The concentration ranges of the elements were: 23.59–97.72 mg.kg -1 Fe; 0.01–5.15 mg.kg -1 Cu; 4.95–48.23 mg.kg -1 Zn; 0.13–7.93 mg.kg -1 Ni; 0.01–1.37 mg.kg -1 Mn; 0.01–5.68 mg.kg -1 Cd; 0.01–4.60 mg.kg -1 Pb and 0.01–3.43 mg.kg -1 Cr. The concentrations of iron, manganese, copper, zinc were below the permissible limits while those of cadmium, nickel, chromium and lead in some samples were at levels above the permissible limits. The body burden with these elements is very dependent on the concentration of the various elements in major sources of animal protein, namely turkey meat, chicken meat and gizzard, the frequency of consumption of these foods and the rate of detoxification in the human body.

http://tru.uni-sz.bg/bjvm/vol11-no4-08.pdf

Heavy metal residues of chicken meat and gizzard and turkey meat consumed in southern Nigeria.

Water quality changes in relation to Diptera community patterns and diversity measured at an organic effluent impacted stream in the Niger Delta, Nigeria

This communication presents the results of preliminary investigation of the characteristic levels of heavy metals in surface soils of an oilfield in the Niger Delta. The results indicate higher concentration of the following metals: Cd, Pb, Cu; Ni, Zn, Cr, Mn and Hg in soils around the gas plant than the pipeline areas. There is a significant temporal and spatial variation in the concentrations of the heavy metals. Samples collected during the wet season showed lower concentrations of heavy metals. The distribution pattern of heavy metals follows the following order Fe> Mn> Zn> V> Cr> Pb> Cu> Ni> Cd> Hg> As. The soils around the oilfield could be considered unpolluted since the concentrations of the metals fit into background levels and concentrations found in natural and agricultural soils. Since metal build up is a gradual process, farmland, fishing ponds and water bodies closer to these facilities will be at risk of heavy metal pollution over time.

/pdf/preliminary-assessment-of-heavy-metals-levels-of-soils-of-an-xx2dqzplk1.pdf

Chukwujindu M. A. Iwegbue

Papers

Trace heavy metals composition of some Nigerian beverages and food drinks

Heavy metal residues of chicken meat and gizzard and turkey meat consumed in southern Nigeria.

Water quality changes in relation to Diptera community patterns and diversity measured at an organic effluent impacted stream in the Niger Delta, Nigeria

Preliminary assessment of heavy metals levels of soils of an oil field in the niger delta, nigeria

Characteristic levels of heavy metals in soil profiles of automobile mechanic waste dumps in Nigeria