University of California

Chromotropic acid method for determining 2,4-D residues in rinses


Louis C. Erickson
B. L. Brannaman

Authors Affiliations

Louis C. Erickson was Associate Plant Physiologist in the Experiment Station, Riverside; B. L. Brannaman was Principal Laboratory Technician in the Experiment Station, Riverside.

Publication Information

Hilgardia 23(7):175-184. DOI:10.3733/hilg.v23n07p175. December 1954.

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The chromotropic acid method for determining small amounts of 2,4-D was placed on a quantitative basis and used to determine the extent of contamination of various metals and glass left in contact with 2,4-D.

Aluminum, iron, and zinc retained the greatest amounts of 2,4-D, while copper, tin, and glass were more readily decontaminated.

Several prolonged rinses of water were effective in removing the salts but not the esters of 2,4-D. The esters required soaking in an organic solvent. The latter procedure would be expensive and hazardous for cleaning spray equipment.

The best way of avoiding injury to sensitive plants would be to have separate spray equipment for 2,4-D.

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Erickson L, Brannaman B. 1954. Chromotropic acid method for determining 2,4-D residues in rinses. Hilgardia 23(7):175-184. DOI:10.3733/hilg.v23n07p175
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