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The Determination of Picloram Residues in Soil Using Gas Chromotography

Published online by Cambridge University Press:  12 June 2017

M. G. Merkle ,
R. W. Bovey  and
R. Hall
M. G. Merkle
Affiliation:
Crops Research Division Agricultural Research Service, U. S. Department of Agriculture
R. W. Bovey
Affiliation:
Crops Research Division Agricultural Research Service, U. S. Department of Agriculture
R. Hall
Affiliation:
Department of Range and Forestry, Texas A&M University, College Station, Texas
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Abstract

A chromatographic procedure for detecting 4-amino-3,5,6-tricholorpicolinic acid (picloram) residue to a sensitivity of approximately 0.05 ppm in soils is described. Picloram is extracted from soil as the free acid and methylated with boron trifluride-methanol reagent. Data indicate that the amount of herbicide which actually reaches the soil may only be 10% of that applied to dense stands of oak. Rainfall was an important factor in determining the movement and persistence of picloram. Picloram was detected to a depth of 24 in within 6 weeks after application. No detectable residues were found in the upper 24 in of soil after one year with rates as high as 8 lb/A.

Type
Research Article
Information
Weeds , Volume 14 , Issue 2 , April 1966 , pp. 161 - 164
Copyright
Copyright © 1966 Weed Science Society of America 

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References

Literature Cited

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