Air-drying and pretreatment effects on soil sulfate sorption

S. D. Comfort, R. P. Dick, J. Baham

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Drying, freezing, and refrigeration are commonly employed to facilitate the handling and storage of samples on which chemical, biological, and physical analyses are to be performed. These laboratory protocol have the potential to alter soil chemical characteristics and may result in unrealistic estimates of in situ chemical processes. We determind the effect of air drying, storage temperature, and time on SO4-sorption characteristics. Sulfate-sorption experiments were conducted in the field on moist samples and compared with laboratory results for the same soils that had been kept frozen (-5°C) refrigerated (4°C) for 14 or 60 d, or air dried. Only air drying significantly altered SO4-sorption characteristics. The impact of air drying on SO4-sorption capacities was then determined on 29 pedons (84 horizons) from four northeastern USA (NE) and three southern Blue Ridge province states. A suite of physico-chemical properties of soils whose sorption capacities were affected by drying were also measured. The SO4-sorption capacity increased as much as 320% when dried soils were compared with field-moist samples. Soils whose sorption capacities were most affected by air drying included the NE soils group, which had a higher percentage of the clay fraction in the form of amorphous minerals and were high in exchangeable acidity and total organic C. Air drying caused significant decreases in ethylenediaminetetraacetic acid (EDTA) extractable Fe and Al, oxalate-extractable Al, and KCl-extractable Al. This suggests the formation of new solids on drying, which increase SO4 sorption. Development of a multivariate model, however, indicated that total organic C, change in Fe extracted by pyrophosphate, dry minus moist; change in Fe extracted by oxalate, dry minus moist; and H+ solution concentration in 0.01 M CaCl2, dry minus moist were the best predictors of the change in SO4 sorption capacity with drying.

Original languageEnglish (US)
Pages (from-to)968-973
Number of pages6
JournalSoil Science Society of America Journal
Volume55
Issue number4
DOIs
StatePublished - Jan 1 1991

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air drying
sorption
sulfates
pretreatment
sulfate
air
soil
drying
oxalates
oxalate
effect
pedon
clay fraction
EDTA (chelating agent)
pyrophosphates
soil chemical properties
refrigeration
EDTA
chemical process
sampling

ASJC Scopus subject areas

  • Soil Science

Cite this

Air-drying and pretreatment effects on soil sulfate sorption. / Comfort, S. D.; Dick, R. P.; Baham, J.

In: Soil Science Society of America Journal, Vol. 55, No. 4, 01.01.1991, p. 968-973.

Research output: Contribution to journalArticle

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