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Collaborative study of infrared analysis of dicamba--2-methyl-4-chlorophenoxyacetic acid and dicamba--2,4-dichlorophenoxyacetic acid formulations

Malina, M.

Journal - Association of Official Analytical Chemists 54(3): 706-710

1971

ISSN/ISBN: 0004-5756
PMID: 5162930
Document Number: 39135
Following earlier work on infra-red analysis of dicamba (see Weed Abstr. 18: 1404), infra-red techniques were investigated for the determination of aqueous solutions of dicamba + MCPA + 2, 4-D formulated as dimethylene salts. Samples were acidified, extracted with CHCl3 and the dicamba, MCPA and 2, 4-D measured in the 1012, 1070 and 1080 cm-1 bands, respectively. Absorbances were compared to those of a reference standard. Results from 12 collaborating laboratories showed excellent precision and accuracy, with respective coefficients of variation of 0.059 and 0.063 for dicamba + MCPA and 0.059 and 0.091 for dicamba + 2, 4-D. This method is recommended for adoption as official, first action.

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