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Copper Chloride as an Extractant for Estimating the Potentially Reactive Aluminum Pool in Acid Soils¹

ABSTRACT

The reactive Al pool in selected Ultisols, Oxisols, and Histosols from Africa, South America, and North Carolina was estimated by extraction with 1N CuCl₂. The Al-saturated clay minerals with and without interlayered hydroxy-Al were used to compare the extractability of Al by 1N CuCl₂ and 1N KCl.

The 1N solutions of KCl and CuCl₂ were equally effective in extracting exchangeable Al from an Al saturated montmorillonite. The 1N CuCl₂ solution, however, extracted almost twice as much Al from an Al saturated vermiculite containing a hydroxy Al interlayer as compared with 1N KCl. Generally, more than twice as much Al was extracted from acid surface soils (< pH 5) by 1N CuCl₂ than by 1N KCl suggesting that Al bound by organic matter was being extracted by the CuCl₂.

¹ Journal Series No. 5674 of the North Carolina Agricultural Exp. Stn., Raleigh, NC 27650.

² Visiting Soil Scientist and Professor, respectively. The senior author is on sabbatical leave from the International Institute of Tropical Agriculture, PMB 5320, Ibadan, Nigeria.

Received for publication August 3, 1978. Accepted for publication September 20, 1978.

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