The factors driving spatial variability of N leaching in
the catchment will be studied using porous cup methods for N leaching measurement, detailed information on past crop management, conductivity and Gamma-Radiometer soil sensors to map soil properties, and Digital Elevation Models (DEM), all integrated using the latest Digital Soil Mapping (DSM) techniques.
Caption: The Carmacks project in Canada's Dawson district will pursue tank leaching in
favor of heap leaching.
Through leaching in
surface environments, the antimony compounds release antimony through hydrolysis.
The average of nitrogen losses through leaching in
the beginning of the season, in the middle of season and at the end of season during two years experiments is shown in Fig.
The chemical equations for PbS leaching in
acid solution with and without oxidants are following:
In a separate experiment, the scientists compared leaching in
10 minutes of contact between condom rubber and artificial sweat with the effect of an hour-long exposure.
In several other reports examining CCA leaching, the order of leaching in
seawater is Cu > Cr > As (Weis et al.
The estimated high N[O.sub.3.sup.-]-N leaching losses from a grazed paddock in the grazing only scenario demonstrate, again, the importance of `hot' urine spots in causing N[O.sub.3.sup.-] leaching in
grazed pastures (Table 5).
Results of the RMT and UW research demonstrated that the relationship between leach tests and field leaching is complex and that chemical and physical influences on leaching in
both laboratory and field testing need to be understood before extrapolating laboratory test results to the field.
Eight blocks were treated with each solution to provide three blocks for leaching in
water or citrate buffer, with two blocks being retained for reference.
We have studied effects of CCA leaching in
estuaries and salt marshes for over a decade and have clear evidence of harm, especially in poorly flushed areas and particularly with new wood.
1979), although recently there have been observations of organic N leaching in
British soils (D.
To put the relative simplicity of heap leaching in
perspective, the only item of process equipment which may require a poured concrete foundation, is the crushing plant.
Cutting emissions would slow a forest's rate of degradation, he acknowledges, "but not rebuild the cations -- like calcium -- back up in the forest floor." Indeed, he notes, acid leaching in
some places appears to have removed in just 40 to 50 years some 500 years' worth of calcium laid down naturally.
The use of bacteria, for the natural degradation of sulphides as an alternative to roasting or pressure leaching in
the treatment of refractory gold ores has been studied for many years.