نتایج جستجو برای: biological leaching

تعداد نتایج: 472925  

2010
OSNAT GOLDREICH YAAKOV GOLDWASSER YAEL G. MISHAEL

8 A controlled-release formulation (CRF) has been developed for metolachlor, which reduced its 9 leaching in a sandy soil and improved weed control in comparison with the commercial formula10 tion. The current study tested the effect of soil wetting and drying cycles (WDCs) on metolachlor 11 fate (desorption, leaching, and weed control) applied as the CRF and as the commercial formula12 tion. M...

Journal: :The Science of the total environment 2004
I P Holman I G Dubus J M Hollis C D Brown

Although macropore flow is recognized as an important process for the transport of pesticides through a wide range of soils, none of the existing spatially distributed methods for assessing the risk of pesticide leaching to groundwater account for this phenomenon. The present paper presents a spatially distributed modelling system for predicting pesticide losses to groundwater through micro- an...

Journal: :The Science of the total environment 2012
Joshua Kastner David G Cooper Milan Marić Patrick Dodd Viviane Yargeau

A method was developed to assess leaching of several poly(vinyl chloride) (PVC) plasticizers in aqueous media using gas chromatography (GC), and compared to a gravimetric standard test method (ASTM Method D1239). The GC method was a more direct measurement of plasticizer concentration in the aqueous phase. The leaching of commercial plasticizers, as well as several series of "green" candidate p...

Journal: :Applied and environmental microbiology 1992
L Ahonen O H Tuovinen

The purpose of the work was to quantitatively characterize temperature effects on the bacterial leaching of sulfide ore material containing several sulfide minerals. The leaching was tested at eight different temperatures in the range of 4 to 37 degrees C. The experimental technique was based on column leaching of a coarsely ground (particle diameter, 0.59 to 5 mm) ore sample. The experimental ...

In copper heap leaching structures, the ore is leached by an acidic solution. After dissolving the ore mineral, the heap is drained off in the acidic solution using a drainage system (consisting of a network of perforated polyethylene pipes and gravelly drainage layers) and is, then, transferred to the leaching plant for copper extraction where the copper is extracted and the remaining solution...

غلامرضا ثواقبی فیروزآبادی, , حجت امامی, , مهدی شرفاء, ,

Increasing soil contamination by chemicals has become an issue of increasing environmental concern. Leaching of chemicals into and through the vadose zone creats serious problems due to the contamination of the soil matrix, soil solution and groundwater. Therefore, in order to study the effect of the preferential flow, macropores and organic matter on mobility and leaching of the metals such as...

2003
A. B. M. Badruzzaman

Arsenic in groundwater was first detected in Bangladesh at Chapai Nawabgonj district in 1993. Since then arsenic contamination problem has been reported from almost every parts of the country. It is estimated that approximately 27% of the wells are contaminated with levels above 50ppb, the current drinking water standard for arsenic in Bangladesh (Kinninburg, D. G., et al., 2001). It is also es...

Journal: :Applied and environmental microbiology 1994
S I Niemelä C Sivelä T Luoma O H Tuovinen

The maximum temperature for growth (T(max)) was determined for pure and mixed cultures of acidophilic thiobacilli. The experimental system was based on incubating the cultures in liquid media exposed to a linear temperature gradient. The T(max) values varied within the range of 36.1 to 43.6 degrees C.

Journal: :international journal of environmental research 2010
m. saeedi a. rezaei bazkiaei z. torkaman

solidified samples of fuel oil combustion bottom ash with two sets of ordinary portland cement (opc) and pozzolan added opc were investigated with three sets of chemical leaching tests. toxicity characteristic leaching test (tclp) results classified waste material and its solidification products as hazardous. although ni and cr have over-leached, but their close examination with sequential chem...

Journal: :Journal of environmental management 2013
Sivakumar Naganathan Hashim Abdul Razak Siti Nadzriah Abdul Hamid

This paper reports the corrosivity and leaching behavior of CLSM made using two different industrial wastes i.e. bottom ash from an incineration facility and quarry dust. The leachate samples were derived from fresh and hardened CLSM mixtures, and studied for leaching and electrical resistivity. The release of various contaminants and the consequent environmental impact caused by the contaminan...

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