Sequential Extraction of Aluminum and Iron from Acidic Soils by Chemical Selective Dissolution MethodsEnglish Full Text
HE JIZHENG; LI XUEYUAN and A. VIOLANTE(Department of Soil and Agrochemistry, Huazhong Agricultural University, Wuhan 430070 (China))(Dipartimento di Scienze Chimico-Agrarie, Universita di Napoli "Federico II", Napoli 80055 (Italy))
Abstract: Potassium chloride, Na-pyrophosphate, CuCl2, NH4-oxalate, dithionite-citrate-bicarbonate （DCB） and Na-citrate solutions were employed to extract aluminum （Al） and iron （Fe） sequentially and separately from 15 acidic soils located at the Mangshan Mountains, Hunan Province, China. Many evidences showed that separate pyrophosphate extracted mainly KCI-extractable Al, organo-Al complexes and some inorganic Al compounds, whereas separate CuCl2 extracted KCl-extractable Al and some organo-Al complexes. CuCl2 extracted much less amounts of Al than pyrophosphate did from the soils. Separate oxalate did not extract all KCl-Pyrophosphate- CuCl2 -oxalate sequentially extractable Al and Fe. Also, separate DCB did not extract all KCl- pyrophosphate- CuCl2 -oxalate- DCB sequentially extractable Al. The forms of Al extracted by oxalate and DCB from the soils were majorly noncrystalline. The interlayered materials of 1.4-nm intergrade minerals of the soils were attributed mainly to hydroxy Al polymers.
- Series：
(D) Agriculture
- Subject：
Fundamental Science of Agriculture; Agronomy
- Classification Code：
S153
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