
TY  - JOUR
A1  - Menzies, NW 
A1  - Bell, LC 
A1  - Edwards, DG 
T1  - Effects of incubation time and filtration technique on soil solution composition with particular reference to inorganic and organically complexed Al
JF  - Soil Research
JO  - Soil Res.
Y1  - 1991
VL  - 29
IS  - 2
SP  - 223
EP  - 238
KW  - 
UR  - https://doi.org/10.1071/SR9910223 
N2  - Soil solutions were extracted from surface and subsoil samples of highly weathered soils in the field moist state and from air-dry samples which had been re-wet and incubated at 28°C for 1 to 64 days. Soil solutions were analysed following filtration through 0.22 pm and 0-025 µm pore-diameter hembranes. Selected samples were also incubated following sterilization by gamma irradiation (50 kGy) to investigate the effects of microorganisims on soil solution C dynamics. Ultra-filtration did not affect the concentration of the major cations or anions but significantly reduced Al, Fe, Mn, Si and organic C concentration in some surface soil solutions extracted from field-moist samples and from re-wet air-dry samples after short incubation periods. The organically-complexed Al concentration in soil solution was significantly increased by air-drying and re-wetting soil; the organic Al concentration decreased with increased time of incubation to levels comparable with that present in field-moist samples. Inorganic monomeric Al reached a stable concentration, comparable with that in field moist samples, when air-dry soils were re-wet and incubated for 1 day. While gamma irradiation effectively sterilized the soil and stabilized the concentration of Al and organic C in solution, the magnitude of the changes in soil solution composition observed as a result of irradiation diminish the value of this finding. 
ER  -

