Li, X., Z. Shen, O. Wai, Y. Li 2000: Chemical partitioning of heavymetal contaminants in sediments of the Pearl River Estuary. - Chemical Speciation and Bioavailability, 12, pp. 17-25.
Chemical partitioning of heavymetal
Authors:N. Jabeen, S. Ahmed, S. Hassan, and N. Alam
The concentration and the sources of heavy metals (Pb, Cd, Zn and Cu) in house dust samples of nine selected houses of Jalil Town, Gujranwala, Pakistan are determined and a comparison with the concentration of these metals in respective street dust samples is given. Sources, exterior as well as interior are identified. The extent of contribution of lead in house dust from exterior sources and interior sources is calculated by determining the isotopic ratios in house dust, street dust and paint used in the houses. It is noticed in the case of well ventilated houses, that most of the heavy metal contribution is from the exterior sources. However, in less ventilated houses, contribution from the interior sources is also significant.
Authors:H. Hamamo, S. Landsberger, G. Harbottle, and S. Panno
The enormous utilization of phosphate rock and super phosphate derived from it have the potential of being an important factor in the contamination of aquifers with alpha emitting radionuclides and heavy metals. Both rock phosphate and super phosphate contain substantial levels of natural uranium, amounting to hundreds of ppm. Our study has shown that whereas the uranium series in phosphate rock is nearly in secular equilibrium, in super phosphate the226Ra and its progeny are depleted by 60–70%. This is a result of the chemical processing of the rock phosphate. On the other hand the super phosphate is much more soluble and can be expected to release its radionuclides to the environment more rapidly than rock phosphate. The present study explores the release of radioisotopes and heavy metals from phosphate fertilizers. Extensive analytical use has been made of a germanium well-detector/Compton suppression system.
The potential of five species of trees as historical monitors of heavy metal air pollution has been investigated. The study was carried out at a site 2 km from an industrial complex including several metal refineries. Using neutron activation, heavy metal concentrations were measured in the xylem as a function of the year of wood formation. The manganese concentrations were by far the highest. In maple trees the high natural level of this essential trace element masked any increases due to pollution. In ash and cedar increased Mn concentrations were found, relative to control trees, but there is evidence for radial translocation. In hemlock the time variations of the average Mn concentrations followed the production rates of the refineries but large variations among individual trees were observed. Hemlock was estimated to accumulate up to 0.3% of the atmospheric Mn input.
Authors:B. Benicewicz, G. Jarvinen, D. Kathios, and B. Jorgensen
Open-celled polymeric foam monoliths prepared by high internal phase emulsion polymerization (HIPE) are being investigated
as improved materials for separation of heavy metals. In column flow studies, the foam monoliths have high flow rates and
are durable up to at least 40 psi. A 4-vinylpyridine functionality has been incorporated into vinylbenzylchloride/styrene
copolymer foams by graft-polymerization of vinylpyridine. The open structure of the foam and the flexible graft-polymerized
ion-exchange chains result in improved kinetics in metal uptake. Iron uptake kinetics were greatly increased in the grafted
foams over resin beads of similar structure. Plutonium uptake kinetics were moderately increased in the foams.
Authors:M. Frontasyeva, L. Smirnov, E. Steinnes, S. Lyapunov, and V. Cherchintsev
Samples of the mosses Hylocomium splendens and Pleurozium schreberi, collected in the summer of 1998, were used to study the atmospheric deposition of heavy metals and other toxic elements in the Chelyabinsk Region situated in the South Urals, one of the most heavily polluted industrial areas of the Russian Federation. Samples of natural soils were collected simultaneously with moss at the same 30 sites in order to investigate surface accumulation of heavy metals and to examine the correlation of elements in moss and soil samples in order to separate contributions from atmospheric deposition and from soil minerals. A total of 38 elements (Na, Mg, Al, K, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Zn, As, Se, Rb, Sr, Zr, Mo, Sb, Cs, Ba, La, Ce, Nd, Sm, Eu, Gd, Tb, Dy, Yb, Hf, Ta, W, Au, Th, U) in soil and 33 elements Na, Mg, Al, Cl, K, Ca, Sc, V, Cr, Mn, Fe, Co, Ni, Zn, As, Se, Br, Rb, Ag, Sb, Cs, Ba, La, Ce, Sm, Tb, Yb, Hf, Ta, W, Au, Th, U) were determined by epithermal neutron activation analysis. The elements Cu, Cd and Pb (in moss samples only) were obtained by atomic absorption spectrometry. VARIMAX rotated principal component analysis was used to identify and characterize different pollution sources and to point out the most polluted areas.
Authors:Ali Mohammad, Inamuddin, Arshi Amin, Mu. Naushad, and Gaber E. Eldesoky
counterpart (1.20 meq dry g −1 ). Composite cation-exchange particles of mean radius of ∼125 μm (50–70 mesh) in H + form were used to study the kinetic behavior of heavymetal ions viz. Ni 2+ –H + , Cu 2+ –H + , Mn 2+ –H + and Zn 2+ –H + . The rate
Authors:Marina Dimitrova, Sevdalina Turmanova, and Krassimir Vassilev
Research was carried out to determine the activity of complexes of tripeptide–glutathione with heavy metals in the oxidation
of cyclohexene with tert-butylhydroperoxide in toluene at 80 °C. All the complexes were prepared by the interaction of metal ions and glutathione
at room temperature in aqueous solutions. Only the complexes of Mo were obtained from acidic aqueous solution. The characteristics
of these complexes were determined by means of FTIR and Mössbauer spectroscopies and EPR analysis. The products of the epoxidation
and hydroxylation reactions were identified using GC analysis. The complexes of molybdenum and vanadium showed higher activity
in the epoxidation reaction of cyclohexene compared to the other complexes, namely of Mn, Co, Cu, Cr, Fe, Cd and Th. The possible
structures of the complexes are offered. The possible use of glutathione complexes as catalysts in the model reaction of oxidation
is newly demonstrated.
Authors:D. Desideri, M. Meli, C. Roselli, and L. Feduzi
In various samples of Mytilus galloprovincialis, 210Po was determined by alpha-spectrometry while Mn, Fe, Ni, Cu, Zn, Cd, Sn, Hg and Pb by energy dispersive, polarised X-ray
fluorescence spectrometry (EDPXRF). The mussels of different sizes were taken from 7 sites in the central Adriatic Sea along
the Marche coastal region during the four seasons of the year. 210Po activity concentration ranged between 57 and 343 Bq·kg−1 dry weight. The concentration ranges of heavy metals (µg·g−1 dry weight) were as follows: Mn: 72.9–83.1; Fe: 45.1–754; Ni: 1.3–7.6; Cu: 17.9–156; Zn: 60.9–189; Cd: 0.6–1.0; Sn: 0.6–3.9;
Hg always <0.5; Pb: 2.0–9.0. The data obtained depend upon the site and the period of the sampling and they are also compared
with those obtained by other authors for the same organism in the Mediterranean and other Italian seas.