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Direct Liquid Scintillation Radioassay of 14C-Labeled Herbicides in Soil

Published online by Cambridge University Press:  12 June 2017

T. L. Lavy ,
C. G. Messersmith  and
H. W. Knoche
T. L. Lavy
Affiliation:
Dep. of Agron., Univ. of Nebraska, Lincoln 68503
C. G. Messersmith
Affiliation:
Dep. of Agron., North Dakota State Univ., Fargo 58103
H. W. Knoche
Affiliation:
Dep. of Biochem., Univ. of Nebraska, Lincoln 68503
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Abstract

A liquid scintillation counting solution was developed which optimized the direct assay efficiencies of 14C-labeled 2-chloro-4-(ethylamino)-6-(isopropylamino)-s-triazine (atrazine), 3,6-dichloro-o-anisic acid (dicamba), and α,α,α-trifluoro-2,6-dinitro-N,N-dipropyl-p-toluidine (trifluralin) in soil. In this counting technique, 3-g soil samples containing 14C-labeled herbicide were placed directly into a liquid scintillation vial containing a phosphorescent counting solution. Samples were shaken and allowed to settle before assaying using a liquid scintillation spectrometer. This direct radioassay was as efficient or more efficient than double or single extraction processes. Automatic external standardization in conjunction with the liquid scintillation counter was an effective tool for estimating the 14C present in soil samples.

Type
Research Article
Information
Weed Science , Volume 20 , Issue 3 , May 1972 , pp. 215 - 219
Copyright
Copyright © Weed Science Society of America 

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References

Literature Cited

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