Measurement of aqueous aluminum species:  comparison of dialysis and ion-exchange techniques

LaZerte, Bruce D.; Chun, Charles.; Evans, D.R.; Tomassini, F. D.

doi:10.1021/es00174a018

Cited by 54 publications

(18 citation statements)

References 8 publications

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“…All analyses were insensitive to DOC interference, including the ion chromatrographic sulphate method. Aluminum species were estimated with a catechol violet/anion exchange method (LaZerte et al 1988) and with the calculations described in LaZerte (1984). Oliver's model (Oliver et al 1983) was used to estimate the organic anion contribution to charge balance.…”

Section: Methodsmentioning

confidence: 99%

The impact of drought and acidification on the chemical exports from a minerotrophic conifer swamp

LaZerte

1992

Biogeochemistry

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Abstract. A seven year chemical budget of a minerotrophic conifer swamp located on the PreCambrian Shield, Ontario, Canada and subjected to anthropogenically acidified deposition is presented. Contrary to other published studies, this swamp retains sulphate during wet years and exports it during dry years. Alkalinity is always retained (acidity is exported) and base cations are almost always exported. It is predicted that if this pattern continues, the cation exchange sites of the swamp will become increasingly saturated with protons and aluminum ions, and the waters passing through the swamp will be increasingly acidified.

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Section: Methodsmentioning

confidence: 99%

The impact of drought and acidification on the chemical exports from a minerotrophic conifer swamp

LaZerte

1992

Biogeochemistry

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“…Interim guideline values are used in cases where they exist. Guideline values are for total metal concentrations unless otherwise noted -No guideline value, NP direct comparison not possible a The PWQO states that surface water pH should be maintained between 6.5 and 8.5 to protect aquatic life, although the naturally acidic wetland-draining stream may never have reached that range b The Al guideline value is for inorganic Al, however, a previous study of the wetland-draining stream found that *50% of Al was inorganic(LaZerte et al 1988) so it is highly likely that the guideline is exceeded…”

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confidence: 99%

The effects of dissolved organic carbon, acidity and seasonality on metal geochemistry within a forested catchment on the Precambrian Shield, central Ontario, Canada

2009

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Metal pollution, in combination with other environmental stressors such as acid deposition and climate change, may disturb metal biogeochemical cycles. To investigate the influence of dissolved organic carbon, acidity and seasonality on metal geochemistry, this study has described concentrations of 19 metals as they pass through an acidified forested catchment on the Precambrian Shield in south-central Ontario, Canada. Metal, dissolved organic carbon (DOC) and sulphate (SO 4 2-) concentrations fluctuate throughout the catchment compartments as the water passes through and interacts with vegetation, soils and bedrock. Relationships among metals, DOC and SO 4 2-are most pronounced in compartments where DOC and SO 4 2-exhibit high variability, namely in the throughfall, organic horizon soil water, and wetland-draining stream. Metal, DOC and SO 4 2-concentrations varied seasonally in the streams, and temporal coherence occurred among metal, DOC and SO 4 2-concentrations in the organic horizon soil water and the wetland-draining stream (PC1). In the wetland-draining stream, the highest DOC, Cr, Cu, Fe, Pb, and V concentrations occur in the summer, whereas concentrations of SO 4 2-and most other metals peak in the fall after a period of drought. Despite the rural location, provincial water quality objectives for surface water were exceeded for many metals when the peak fall values occurred.

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“…The contribution of organic acids to the ion balance was estimated from measured DOC concentrations and pH (Oliver, Thurman, & Malcolm, 1983). Labile monomeric aluminium (Al 3+ ) concentrations in PC1 and PC1-08 were only determined for a short period of time during the study (1985)(1986)(1987)(1988)(1989)(1990)(1991)(1992)(1993)(1994)(1995) LaZerte, Chun, Evans and Tomassini (1988) and relationships between H + and Al 3+ in PC1 and PC1-08 were used to estimate Al 3+ concentration outside this period. These estimates were based on a generalisation of the accepted gibbsite H-Al relationship.…”

Section: Stream Exportmentioning

confidence: 99%

Acidification at Plastic Lake, Ontario: Has 20 Years Made a Difference?

Watmough

Aherne

Eimers

et al. 2007

Water Air Soil Pollut: Focus

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In response to reduced sulphur emissions, there has been a large decrease in sulphate (SO 2À 4 ; −0.97 μeq l −1 year −1 ) and hydrogen (−1.18 μeq l −1 year −1 ) ion concentration in bulk precipitation between 1980 and 2000 at Plastic Lake in central Ontario. The benefit of this large reduction in SO 2À 4 deposition on stream water chemistry was assessed using the gauged outflow from a conifer-forested catchment (PC1; 23.3 ha), which is influenced by a small wetland located immediately upstream of the outflow. Sulphate concentrations declined, but not significantly due to large inter-annual variation in SO 2À 4 concentration. Between 1980 and 2000, there were significant increases in dissolved organic carbon, ammonium and potassium concentration likely reflecting increased mineralisation in the wetland. Calcium concentrations in PC1 decreased during the two decade period (−2.24 μeq l −1 year −1 ), as a consequence there was no improvement in stream pH and the Ca:Al ratio in PC1 continued to decline. A similar response was noted in an upland-draining subcatchment of PC1-08 that has been monitored since 1987. Despite large reductions in SO 2À 4 deposition and almost complete retention of nitrogen in soil, there has been no improvement (in terms of pH) in stream water at PC1 due to a combination of soil acidification and climatic (droughts, increased mineralisation) perturbations.

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Measurement of aqueous aluminum species: comparison of dialysis and ion-exchange techniques

Cited by 54 publications

References 8 publications

The impact of drought and acidification on the chemical exports from a minerotrophic conifer swamp

The impact of drought and acidification on the chemical exports from a minerotrophic conifer swamp

The effects of dissolved organic carbon, acidity and seasonality on metal geochemistry within a forested catchment on the Precambrian Shield, central Ontario, Canada

Acidification at Plastic Lake, Ontario: Has 20 Years Made a Difference?

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