A COMPARISON AMONG NINE CANADIAN LABORATORIES OF DITHIONITE-, OXALATE-, AND PYROPHOSPHATE-EXTRACTABLE Fe AND Al IN SOILS

Webber, M. D.; McKeague, J. A.; Raad, A. T.; DeKimpe, C.R.; Wang, Chang; Haluschak, P. W.; Stonehouse, H. B.; Pettapiece, W. W.; Osborne, V. E.; Green, A. J.

doi:10.4141/cjss74-038

Can. J. Soil. Sci.

1974

DOI: 10.4141/cjss74-038

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A COMPARISON AMONG NINE CANADIAN LABORATORIES OF DITHIONITE-, OXALATE-, AND PYROPHOSPHATE-EXTRACTABLE Fe AND Al IN SOILS

M. D. Webber¹,

J. A. McKeague²,

A. T. Raad³

et al.

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1977

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Cited by 10 publications

(2 citation statements)

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“…These results were compared with Pe and Al values measured by the atomic absorption technique, assumed to be unaffected by the presence of organic matter (Yuan andBreland,1969? Raad et al,1969;Webber et al,1974) 13 ' 9 ' 12 . The aim was to evaluate the suitability of the destructive methods with respect to the interactions with soil extractants, economy of procedures and accuracy of results.…”

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confidence: 97%

A comparison among pour organic matter destruction methods on soil extracts for the photocolorimetric determination of iron and aluminum

Piccolo

Santroni

1981

Communications in Soil Science and Plant Analysis

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confidence: 97%

A comparison among pour organic matter destruction methods on soil extracts for the photocolorimetric determination of iron and aluminum

Piccolo

Santroni

1981

Communications in Soil Science and Plant Analysis

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“…Acid ammonium oxalate has often proved to be especially troublesome in this respect (e.g. Webber et al 1974, Searly and JOURNAL OF AGRICULTURAL SCIENCE IN FINLAND Daly 1977, Simmons andPlues-Foster 1977). Difficulties may partially be overcome by dilution of the solutions to be analyzed.…”

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confidence: 99%

Extractable aluminium, iron and manganese in mineral soils: II Extractability by oxalate and pyrophosphate

Niskanen

1989

AFSci

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The extractability of aluminium, iron and manganese by 0.05 M oxalate and pyrophosphate was studied in samples of 23 mineral soils. Dilute extractants were studied because conventional reagents may cause problems in analytical work. The mean values for Al, Fe and Mn extracted by conventional Tamm’s oxalate were 67, 81 and 1.5 mmol/kg soil, respectively. On the average, 0.05 M oxalate solutions at pH 2.9 and 4.2 extracted Al, Fe and Mn amounts that were 103, 113 and 87 % and 72, 82 and 83 % of the amounts extractable by Tamm’s oxalate, respectively. Eeach metal released by 0.05 M oxalates correlated closely with that dissolved by Tamm’s oxalate; the r values ranged from 0.967*** to 0.997***. The mean values for Al, Fe and Mn extracted by 0.1 M Na4P2O7 and 0.05 M K4P2O7 were 38, 28 and 0.6 and 33, 29 and 0.6 mmol/kg soil, respectively. The amount of each metal extracted by Na4P2O7 correlated closely with that released by K4P2O7; the r values ranged from 0.87*** to 0.97***.

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Potential pitfalls when using popular chemical extractions to characterize Al‐ and Fe‐containing soil constituents

Rennert,

Lenhardt

2024

J. Plant Nutr. Soil Sci.

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Wet‐chemical extraction of soil to quantify pedogenic species or to remove specific compounds prior to other analyses is an established approach in analytical soil mineralogy and soil chemistry. Interpretation and informational value of data derived from long‐established and frequently used extractions, for instance involving dithionite, oxalate/oxalic acid in the dark (AOD), and pyrophosphate (PYR), suffers from nonuniform practical regulation and missing knowledge about potential methodical limitations. In this review, we analyzed potential pitfalls of these frequently used extractions, with the focus on selectivity and completeness of the methods as derived from effects of time dependency and of phase separation. Major problems we identified comprised that time‐dependency of extraction differed between analytical targets, that a multitude of species is attacked, reducing the selectivity for the original analytical target, and that studies on extraction from model compounds, including analytical targets and nontargets, are not universally present. The latter aspect is crucial for the completeness of AOD and PYR extraction that has not been proven for all potential analytical targets of the methods yet. We practically tested citrate (CIT) extraction of aluminum (Al) and iron (Fe) in organic association, using selected models of soil constituents. Apart from a synthesized poorly ordered Si‐rich short‐range ordered aluminosilicate, CIT did not extract Al from nontarget phases, confirming previous studies, but did extract Al and Fe completely from organic associations. In addition to recommendations on the practical use of dithionite‐based, AOD, citrate‐ascorbate (CA), and CIT extraction, we suggest replacing highly problematic PYR extraction by CIT extraction for metals in organic association in soil and using AOD extraction in combination with CA and CIT extraction to avoid potential misinterpretation of ambiguous data.

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A COMPARISON AMONG NINE CANADIAN LABORATORIES OF DITHIONITE-, OXALATE-, AND PYROPHOSPHATE-EXTRACTABLE Fe AND Al IN SOILS

Cited by 10 publications

References 0 publications

A comparison among pour organic matter destruction methods on soil extracts for the photocolorimetric determination of iron and aluminum

A comparison among pour organic matter destruction methods on soil extracts for the photocolorimetric determination of iron and aluminum

Extractable aluminium, iron and manganese in mineral soils: II Extractability by oxalate and pyrophosphate

Potential pitfalls when using popular chemical extractions to characterize Al‐ and Fe‐containing soil constituents

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