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The routine determination of exchangeable bases in soils by the lundegardh flame spectrographic method
Author(s) -
Black I. A.,
Smith E.
Publication year - 1950
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.2740010704
Subject(s) - soil water , aqua regia , ammonium acetate , leaching (pedology) , mineralogy , chemistry , environmental science , materials science , soil science , metallurgy , chromatography , high performance liquid chromatography , metal
Abstract Considerable changes have been made in Mitchell's methods for spectrographic determination of exchangeable bases in soils. The following paper describes these modifications which include ( a ) the use of an automatic leaching apparatus for extracting the soils with ammonium acetate: this economizes in material and time and permits an approximate estimation of exchangeable hydrogen to be made; ( b ) the use of aqua regia for destroying organic matter; ( c ) a combination of new dilutions and new standards with the use of a metol developer for the plate: this considerably extends the range of soils dealt with by the standard routine; ( d ) a modification of the plate holder, enabling 88 spectrograms to be recorded on one 5‐in. × 4‐in. plate; and ( e ) a method of plotting working curves from the photometric data which is considered to have several advantages over those in general use.