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Copper Chloride as an Extractant for Estimating the Potentially Reactive Aluminum Pool in Acid Soils
Author(s) -
Juo A. S. R.,
Kamprath E. J.
Publication year - 1979
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1979.03615995004300010006x
Subject(s) - ultisol , oxisol , vermiculite , montmorillonite , soil water , chemistry , copper , extraction (chemistry) , chloride , histosol , organic matter , mineralogy , nuclear chemistry , environmental chemistry , soil organic matter , geology , soil science , organic chemistry , paleontology , soil biodiversity
The reactive Al pool in selected Ultisols, Oxisols, and Histosols from Africa, South America, and North Carolina was estimated by extraction with 1 N CuCl 2 . The Al‐saturated clay minerals with and without interlayered hydroxy‐Al were used to compare the extractability of Al by 1 N CuCl 2 and 1 N KCl. The 1 N solutions of KCl and CuCl 2 were equally effective in extracting exchangeable Al from an Al saturated montmorillonite. The 1 N CuCl 2 solution, however, extracted almost twice as much Al from an Al saturated vermiculite containing a hydroxy Al interlayer as compared with 1 N KCl. Generally, more than twice as much Al was extracted from acid surface soils (< pH 5) by 1 N CuCl 2 than by 1 N KCl suggesting that Al bound by organic matter was being extracted by the CuCl 2 .