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Unbuffered and Buffered Salt Methods for Exchangeable Cations and Effective Cation‐Exchange Capacity
Author(s) -
Amacher M. C.,
Henderson R. E.,
Breithaupt M. D.,
Seale C. L.,
LaBauve J. M.
Publication year - 1990
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/sssaj1990.03615995005400040018x
Subject(s) - chemistry , salt (chemistry) , cation exchange capacity , soil water , chloride , extraction (chemistry) , ion exchange , soil test , inorganic chemistry , nuclear chemistry , chromatography , ion , soil science , geology , organic chemistry
This study was conducted to determine if a single unbuffered salt extractant for exchangeable bases and Al could be used in place of a buffered salt extractant for exchangeable bases and an unbuffered salt extractant for exchangeable Al. Barium chloride and a mixed NH 4 Cl‐BaCl 2 extractant were compared with NH 4 OAc for determining exchangeable bases and with KCl for determining exchangeable Al in soils. In general, BaCl 2 extracted less exchangeable K than either NH 4 OAc or NH 4 CL‐BaCl 2 . The NH 4 CL‐BaCl 2 extractant was equivalent overall to NH 4 OAc for extracting exchangeable bases and to KCl for extracting exchangeable Al, although less K was extracted by NH 4 Cl‐BaCl 2 at low levels of K for some Coastal Plain soils. The NH 4 Cl‐BaCl 2 extractant can be used by soil‐test or soil‐characterization labs as a simple one‐step extractant in place of NH 4 OAc and KCl for the determination of exchangeable cations and effective cation‐exchange capacity of soils.