Factors influencing phosphorous adsorption in mine soils in Galicia, Spain

SURFACE STRUCTURES:ENVIRONMENTAL strongly depressed in sterilized sediments. The effect of delays between sampling, incubation and extraction on methylation rates and Mesc3Hg recovery was documented. Despite their limited spatial and temporal range, these data are further evidence that concerns about the potential toxicological impacts of Hg emissions in the Amazon basin are justified. (from Authors) 968323 Prediction of nitrate concentrations in effluent from spent ore A. D. Davis, A. Heriba & C. J. Webb, Mining Engineering, 48(2), 1996, pp 79-83. The disposal of an additional several hundred million tons of spent ore from heap-leaching operations is planned in the western US during the next decade. In the past decade, more than 15 million tons of spent ore have been disposed of in the Black Hills of South Dakota. South Dakota’s nitrate offloading limits vary for each mine, depending on ore type and other factors. Concentrations of nitrate in the leachate from spent ore depositories could be the result of conversion from other nitrogen-containing species. One likely source of nitrate is residual explosives from the blasting of ore. Another likely nitrate source is the degradation of cyanide to ammonia, followed by oxidation to nitrite and nitrate. A third possibility may be leaching of background nitrate from soil or rock. (from Authors) 968324 Hydrogeocbemlstry of mlnewaters flowing from abandoned coal worklngs in County Durbam P. L. Younger, Quarterly Journal of Engineering Geology, 28(Supp1.2), 1996, pp SlOl-Sl13. Although all deep mining has now ceased in the Durham coalfield of northern England, dewatering still continues in the central area of the Coal Measures outcrop. Beyond the radius of influence of the dewatering pumps, the water table has already recovered, and several uncontrolled minewater discharges are found. These waters are moderately mineralized and may have appreciable alkalinity. Iron loadings are typically high and give rise to thick ochre deposits on streambeds. White deposits are associated with higb aluminium concentrations. Existing hydrochemical classification schemes inadequately characterize these waters; therefore a new scheme is proposed which should be applicable in many areas with similar geology. (from Author) 968325 Ground movements over tbe coal mines of southern Limburg, tbe Netherlands, and their relation to rising mine waters R. F. Bekendam & J. J. Pottgens, in: L.andsubsidence. Proc. international symposium, The Hague, 1995, ed F.B.J. Barends & others, (L4HS; Publication, 234), 1995, pp 3-12. After the abandonment of the mines in the 1970s most mine water pumps were switched off and the deeper mines became flooded. Due to the rising mine waters a small vertical lift occurred at the surface of up to 25 cm, which did not bring about additional damage. When pumping ceased completely and the mine waters reached the shallow mines the presence of water and its overburden adversely affect the stability of roof, pillars and shafts. This may result in the formation of sinkholes or subsidence troughs. Also the water-supply might be impeded. This article gives an overview of the consequences of the mining activities. (from Authors) 968326 Factors influencing phosphorus adsorption in mine soils in Galkia, Spain C. Monterroso Martinez, M. L. Fernandez Marcos & E. Alvarez Rodriguez, Science of the Total Environment, 180(2), 1996, pp 137-145. Available phosphorus levels and P sorption capacity were investigated in soils derived from coal mine spoils at As Pontes, currently in the process of reclamation. Clays and

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shales, often in conjunction with pyrite and other sulphides, are the main constituents of the spoils; many are extremely acid as a result of oxidation of sulphides. Reclamation tasks consisted of topsoiling, chemical and organic fertilizing or various amendments. Two depths (O-15 and 15-30 cm) were sampled and analysed. Olsen P values ranged between 1 and 54 mg/kg-‘. The phosphorus sorption index (PSI) ranged between 2.4 and 55.1. Multiple correlation between PSI and several soil parameters was investigated using a stepwise linear regression method. Four soil parameters (oxalateextractable Fe and Al, pH in KC1 and organic carbon) were shown to explain 79% of the variance in log PSI. (Authors) 968327 Solubility equilibria controlling solution phosphorus concentration in minesolls ln Gallcia, Spain E. Alvarez Rodriguez, M. L. Femandez Marcos & C. Monterroso Martinez, Science of the Total Environment, 180(2), 1996, pp 147-154. Solution P control through dissolution/precipitation equilibria was studied in coal mine soils in Galicia, NW Spain. Soil solution was obtained by a column displacement method and analysed for pH, Eh, electrical conductivity, and most common anions and cations. Ionic activities were calculated using the program SOLMINEQ and saturation indexes determined for several phosphate minerals. Strengite, variscite, fluorapatite or MnPO,.1.5HsO appeared to control phosphorus solubility, depending on Eh, pH and ionic strength conditions. (Authors) 968328 In situ and laboratory &tulles on the fate of speclflc organic compounds in an anaerobic landfill leachate plume, 1. Experimental condltlons and fate of pbenollc compounds P. H. Nielsen, H.-J. Albrechtsen, G. Heron & T. H. Christensen, Journal of Contaminant Hydrology, 20(1-2), 1995, pp 27-50. The transformation of specific organic compounds was investigated by in situ and laboratory experiments in an anaerobic landfill leachate pollution plume at four different distances from the landfill. This paper presents the experimental conditions in the in situ microcosm and laboratory batch microcosm experiments performed and the results on the fate of 7 phenolic compounds. (from Authors) 968329 In situ and laboratory studles on the fate of specific organic compounds in an anaerobic landflll leacbate plume, 2. Fate of aromatic and chlorinated allpbatlc compoonds P. H. Nielsen, H. Bjarnadottir, P. L. Winter & T. H. Christensen, Journal of Contaminant Hydrology, 20(1-2), 1995, pp 51-66. The transformation of specific organic compounds was investigated by in situ and laboratory experiments in an anaerobic landfill leachate pollution plume at four different distances from the landfill. This paper presents the results on the fate of 8 aromatic compounds and 4 chlorinated aliphatic compounds. (from Authors) 968330 Water quallty and reclamation management in mining using bacterlcides V. Rastogi, Mining Engineering, 48(4), 1996, pp 71-76. Surfactant-based bactericides are able to control acid formation in sullidic materials such as pyrite and sultidic ores, thereby helping to abate acid rock drainage. Bactericides arc used in the following two ways: as periodic or continuous spray treatments for the prevention of acidification of material actively handled and moved and in wntrolledrelease form for reclamation. Results from two active coal refuse sites show that acid production can be reduced by 88% or more. Results from reclaimed sites show that bactericide treatment can be more effective than the addition of alkaline materials and can reduce acid production. A secondary beneficial effect of bactericides is on revegetation, and