Abstract:
:Acidification of mine wastes can lead to a series of environmental problems, such as acid drainage, heavy metal mobilization, and ecosystem degradation. Prediction of acid-forming potential is one of the key steps in management of sulfide-bearing mine wastes. In this paper, the acid-forming potential of 180 mine waste samples collected from 17 mine sites in China were studied using a net acid generation (NAG) method. The samples contained different contents of total sulfur (ranging from 0.6 to 200 g kg(-1)), pyritic sulfur (ranging from 0 to 100 g kg(-1)), and acid neutralization capacity (ANC, ranging from -41 to 274 kg H2SO4 t(-1)). Samples with high acid-forming potential are generally due to their high sulfur content or low acid neutralization capacity. After the samples were oxidized by H2O2, the amounts of acid generation and the final NAG pH were measured. Results indicated that the final NAG pH gave a well-defined demarcation between acid-forming and non-acid-forming materials. Samples with final NAG pH >or= 5 could be classified as non-acid-forming materials, while those with NAG pH
journal_name
J Environ Qualjournal_title
Journal of environmental qualityauthors
Liao B,Huang LN,Ye ZH,Lan CY,Shu WSdoi
10.2134/jeq2006.0420subject
Has Abstractpub_date
2007-05-07 00:00:00pages
887-91issue
3eissn
0047-2425issn
1537-2537pii
36/3/887journal_volume
36pub_type
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journal_title:Journal of environmental quality
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journal_title:Journal of environmental quality
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pub_type: 杂志文章,评审
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journal_title:Journal of environmental quality
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journal_title:Journal of environmental quality
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journal_title:Journal of environmental quality
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abstract::An 8-yr field-scale study, 2005 to 2012, investigated effects of agricultural land use on nutrient and sediment losses during snowmelt runoff from four treatment fields in southern Manitoba. In 2005, two fields with a long-term history of annual crop (AC) production were planted to perennial forage (PF), while two oth...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2014.01.0040
更新日期:2014-09-01 00:00:00
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journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2001.303702x
更新日期:2001-05-01 00:00:00
abstract::The area under no-till (NT) in Brazil reached 22 million ha in 2004-2005, of which approximately 45% was located in the southern states. From the 1970s to the mid-1980s, this region was a source of carbon dioxide to the atmosphere due to decrease of soil carbon (C) stocks and high consumption of fuel by intensive till...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2005.0233
更新日期:2006-07-06 00:00:00
abstract::Aqueous degradation rates, which include hydrolysis and epimerization, for chlortetracycline (CTC), oxytetracycline (OTC), tetracycline (TET), lincomycin (LNC), sulfachlorpyridazine (SCP), sulfadimethoxine (SDM), sulfathiazole (STZ), trimethoprim (TRM), and tylosin A (TYL) were studied as a function of ionic strength ...
journal_title:Journal of environmental quality
pub_type: 杂志文章
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更新日期:2008-02-11 00:00:00
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journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2007.0376
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abstract::Growing nitrogen (N) catch crops can reduce NO(3)-N leaching after cultivating cereals. The objective of this study was to relate NO(3)-N leaching to variation in the uptake of N and the size and distribution of the root systems of different catch crops species. In a 3-yr lysimeter experiment, phacelia (Phacelia tanac...
journal_title:Journal of environmental quality
pub_type: 杂志文章
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abstract::Municipal programs for turfgrass establishment recommend large volume-based application rates of composted municipal biosolids (CMB). This study compared runoff water quality among combinations of two common turfgrass establishment practices and two CMB sources. Bryan- or Austin-CMB were incorporated into 5 cm of soil...
journal_title:Journal of environmental quality
pub_type: 杂志文章
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更新日期:2007-05-25 00:00:00
abstract::The increasing number of polluted watersheds and water bodies with total maximum daily loads (TMDLs) has resulted in increased research to find methods that effectively and universally identify fecal pollution sources. A fundamental requirement to identify such methods is understanding the microbial and chemical proce...
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abstract::Acid waste bentonite is a byproduct from vegetable oil bleaching that is acidic (pH < 3.0) and hydrophobic. These materials are currently disposed of in landfills and could potentially have a negative impact on the effective function of microbes that are intolerant of acidic conditions. A study was undertaken using th...
journal_title:Journal of environmental quality
pub_type: 杂志文章
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journal_title:Journal of environmental quality
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journal_title:Journal of environmental quality
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abstract::Erythromycin has been widely used in food-producing animals and in humans, and is frequently detected as an organic pollutant in U.S. streams. In batch experiments with homoionic clays, the Freundlich isotherms were determined at 10 and 25 degrees C. The adsorption of erythromycin A was strongly influenced by clay typ...
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abstract::Quantification of soil carbon (C) cycling as influenced by management practices is needed for C sequestration and soil quality improvement. We evaluated the 10-yr effects of tillage, cropping system, and N source on crop residue and soil C fractions at 0- to 20-cm depth in Decatur silt loam (clayey, kaolinitic, thermi...
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pub_type: 杂志文章
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abstract::Sand-sized particles (>63 microm) in whole storm water samples collected from urban runoff have the potential to produce data with substantial bias and/or poor precision both during sample splitting and laboratory analysis. New techniques were evaluated in an effort to overcome some of the limitations associated with ...
journal_title:Journal of environmental quality
pub_type: 杂志文章
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abstract::In the relatively pristine ecosystem in Kejimkujik Park, Nova Scotia, methylmercury (MeHg) concentrations in loons, Gavia immer, are among the highest recorded anywhere in the world. This study investigated the influence of bedrock lithology on MeHg concentrations in wetlands. Twenty-five different wetland field sites...
journal_title:Journal of environmental quality
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更新日期:2009-01-13 00:00:00
abstract::Batch sequential extraction techniques for fractionating metals or metalloids in soils are time consuming and subject to several potential errors. The development of a continuous-flow sequential extraction method for soil As is described and assessed, having the benefits of simplicity, rapidity, less risk of contamina...
journal_title:Journal of environmental quality
pub_type: 杂志文章
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更新日期:2001-11-01 00:00:00
abstract::Polyacrylamide (PAM) is applied to 400000 irrigated hectares annually in the USA to control irrigation-induced erosion, yet the fate of dissolved PAM applied in irrigation water is not well documented. We determined the fate of PAM added to furrow streams under two treatments: Initial-10, 10 mg L(-1) PAM product appli...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:
更新日期:2002-03-01 00:00:00