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AUTOMATED COLORIMETRIC PROCEDURE FOR THE DETERMINATION OF TOTAL AND UNCHANGED UREA HERBICIDE RESIDUES IN SOIL
Author(s) -
And J. A. GUTH,
VOSS G.
Publication year - 1971
Publication title -
weed research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.693
H-Index - 74
eISSN - 1365-3180
pISSN - 0043-1737
DOI - 10.1111/j.1365-3180.1971.tb00986.x
Subject(s) - chemistry , leaching (pedology) , urea , chromatography , environmental chemistry , colorimetry , soil water , environmental science , organic chemistry , soil science
Summary. An automated colorimetric method has been described for the determination of both total and unchanged herbicide residues of the urea herbicides fluometuron, metobromuron, chlorbromuron and chlortoluron. The method is based on the well‐known Bratton‐Marshall diazotization‐coupling reaction for aromatic amines and is also applicable for other phenylureas as well as for N‐phenylcarbamate and anilide herbicides. The procedure is especially useful when large series of soil samples have to be analysed, for instance in connection with leaching experiments. Manual work and working time have been reduced with this method by up to 50%.