Aluminium speciation: comparison of two spectrophotometric analytical methods and observed concentrations in some acidic aquatic systems in Southern Norway

Seip, H. M.; Müller, L.; Naas, A.

doi:10.1007/bf00185133

Cited by 120 publications

(47 citation statements)

References 15 publications

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“…Monomeric aluminium in solution (Al,) was determined as described by Seip et al (1984). Absorbance values at 340 nm (used to estimate HS in solution) were corrected for turbidity by making measurements at both 340 and 600nm.…”

Section: E X P E R I M E N T a Lmentioning

confidence: 99%

A model of solid‐solution interactions in acid organic soils, based on the complexation properties of humic substances

Tipping

Hurley

1988

Journal of Soil Science

151

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SUMMARY CHAOS (Complexation by Humic Acids in Organic Soils) is a quantitative chemical model of organic soils that incorporates complexation by the functional groups of humic substances and non‐specific ion‐exchange reactions. The two types of interaction are linked by the net humic charge, Z, which depends on the extents of proton and metal complexation, and which in turn determines ionic concentrations in the diffuse part of the electrical double layer, by a Donnan equilibrium. CHAOS was found to account satisfactorily for the results of acid‐base titration experiments (pH range 3–5) with soil samples, giving reasonable simultaneous predictions of solution pH and concentration of A13+. Predictive calculations with CHAOS suggest that organic soils acidified by acid rain would respond on a time‐scale of years‐to‐decades to reductions in rain acidity. An associated effect might be an increase in the concentration of dissolved organic matter in the soil solution.

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Section: E X P E R I M E N T a Lmentioning

confidence: 99%

A model of solid‐solution interactions in acid organic soils, based on the complexation properties of humic substances

Tipping

Hurley

1988

Journal of Soil Science

151

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“…Such information is also important for understanding the water-rock interactions in a study area. Methods for determining various forms of Al separately have been described by several authors (Seip et al, 1984). However, the present work is related to examine the hydrogeochemical processes controlling the groundwater chemistry.…”

Section: Degrees Of Freedom=405mentioning

confidence: 99%

Use of Multivariate Statistical Approaches for Decoding Chemical Evolution of Groundwater near Underground Storage Caverns

Lee¹

2014

Journal of the Korean earth science society

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Multivariate statistical analyses have been extensively applied to hydrochemical measurements to analyze and interpret the data. This study examines anthropogenic factors obtained from applications of correspondence analysis (CA) and principal component analysis (PCA) to a hydrogeochemical data set. The goal was to synthesize the hydrogeochemical information using these multivariate statistical techniques by incorporating hydrogeochemical speciation results calculated by the program, commonly used, WATEQ4F included in the NETPATH. The selected case study was LPG underground storage caverns, which is located in the southeastern Korea. The highly alkaline groundwaters at this study area are an analogue for the repository system. High pH, speciation of Al and possible precipitation of calcite characterize these groundwaters. Available groundwater quality monitoring data were used to confirm these statistical models. The present study focused on understanding the hydrogeochemical attributes and establishing the changes of phase when two anthropogenic effects (i.e., disinfection activity and cement pore water) in the study area have been introduced. Comparisons made between two statistical results presented and the findings of previous investigations highlight the descriptive capabilities of PCA using calculated saturation index and CA as exploratory tools in hydrogeochemical research.

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“…DOC was determined from 1984 onwards using continuous flow colorimetry in which the samples were acidified and purged of CO 2 with nitrogen followed by UV digestion with potassium persulphate and determination of evolved CO 2 using weakly buffered phenolphthalein. Total monomeric aluminium has been determined since 1990 using the method proposed by Seip et al (1984) followed by colorimetric analysis using pyrocatechol violet (Dougan and Wilson, 1974).…”

Section: Chemical Analysesmentioning

confidence: 99%

Long-term changes in precipitation and stream water chemistry in small forest and moorland catchments at Beddgelert Forest, north Wales

Reynolds

Stevens

Brittain

et al. 2004

Hydrol. Earth Syst. Sci.

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Changes in the chemistry of bulk precipitation and stream water between 1982 and 2000 are described for small moorland and forest catchments located within Beddgelert Forest in north Wales. Two forest catchments were partially clearfelled in 1984 (D2; 68% and D4; 28%) whilst a third (D3) remained as an unfelled control until autumn / winter 1998/99 when partial felling took place in the headwaters. Over the monitoring period, the annual mean pH of bulk precipitation increased from 4.6 to 5.1 whilst the annual mean non-seasalt sulphate concentration decreased from 0.53 mg S l 1 in 1985 to 0.24 mg S l 1 in 2000. Since 1985, the annual wet deposition flux of non-seasalt sulphur decreased by 50% to 8.4 kg S ha 1 yr 1 in 2000. Annual mean inorganic nitrogen concentrations and annual wet deposition fluxes have remained relatively unchanged since 1982. The decrease in atmospheric sulphur deposition is reflected by decreased annual mean concentrations of non-seasalt sulphur, acidity, aluminium and calcium in all four streams irrespective of clearfelling activities. Annual variations in nitrate-N and potassium concentrations in the forest streams, largely determined by pulses of leaching following forest clearance, had no effect on stream acidity. In common with UK upland catchments, annual mean concentrations of dissolved organic carbon have increased from about 1 mg C l 1 in 1985 to between 1.5 and 2 mg C l 1 in 2000, although there is considerable year to year variability. Two boreholes drilled adjacent to catchments D3 and D4 have confirmed the presence of alkaline, base rich groundwater at Beddgelert. Although the boreholes are only 150 m apart, there are large differences in chemistry suggesting that different groundwater reservoirs have been intercepted providing further evidence of the complexity and heterogeneity of groundwater systems in upland catchments.

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Aluminium speciation: comparison of two spectrophotometric analytical methods and observed concentrations in some acidic aquatic systems in Southern Norway

Cited by 120 publications

References 15 publications

A model of solid‐solution interactions in acid organic soils, based on the complexation properties of humic substances

A model of solid‐solution interactions in acid organic soils, based on the complexation properties of humic substances

Use of Multivariate Statistical Approaches for Decoding Chemical Evolution of Groundwater near Underground Storage Caverns

Long-term changes in precipitation and stream water chemistry in small forest and moorland catchments at Beddgelert Forest, north Wales

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