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Acid ammonium oxalate (Tamm 1922, Schwertmann 1964, McKeague and Day 1966) and 0.1 M Na 4P 2 07 (Aleksandrova 1960, McKeague 1967) are conventionally used for the extraction of aluminium, iron and manganese from soil. Amorphous oxides and metals bound to organic matter in soil are dissolved by these solutions. The use of these reagents, however, may cause some problems in analytical work. Abstract. 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 1.5mmol/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 Na4P 207 and 0.05 M K 4P 207 were 38, 28 and 0.6 and 33, 29 and 0.6 mmol/kg soil, respectively. The amount of each metal extracted by Na 4P 2 07 correlated closely with that released by K 4P 207 ; the r values ranged from o.B7*** to o.97***.

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