Filters: Tags: Contamination (X)1,271 results (73ms)
The influence of groundwater chemistry on arsenic concentrations and speciation in a quartz sand and gravel aquifer
We examined the chemical reactions influencing dissolved concentrations, speciation, and transport of naturally occurring arsenic (As) in a shallow, sand and gravel aquifer with distinct geochemical zones resulting from land disposal of dilute sewage effluent. The principal geochemical zones were: (1) the uncontaminated zone above the sewage plume [350 µM dissolved oxygen (DO), pH 5.9]; (2) the suboxic zone (5 µM DO, pH 6.2, elevated concentrations of sewage-derived phosphate and nitrate); and (3) the anoxic zone [dissolved iron(II) 100–300 µM, pH 6.5–6.9, elevated concentrations of sewage-derived phosphate]. Sediments are comprised of greater than 90% quartz but the surfaces of quartz and other mineral grains are...
Development and application of a fibre optic fluorimeter for in situ tracer concentration measurements in groundwater and soil
Groundwater pollution by nitrates in a heterogeneous agricultural watershed. II. Evolution of concentrations in the aquifer
Characterizing the spatial distribution of non-aqueous phase contaminants using partitioning tracers and the method of moments
In vitro gastrointestinal method to estimate bioavailable arsenic in contaminated soils and solid media
Dispersion and toxicity of metals from abandoned gold mine tailings at Goldenville, Nova Scotia, Canada