The History, Use, Disposition and Environmental Fate of Agent Orange by Alvin Lee Young

Author:Alvin Lee Young
Language: eng
Format: epub
Publisher: Springer New York, New York, NY

In 1972, the United States Agricultural Research Service published data on the analysis of additional samples of 2,4,5-T herbicide (Woolson et al. 1972). Of 42 samples of 2,4,5-T, 22 samples contained less than 0.5 ppm TCDD. Of the 20 samples containing more than 0.5 ppm of TCDD, 15 were obtained for the yearly survey of one manufacturer. The samples were from 1966 to 1970, with four samples usually collected each year. There was a 10-fold drop in TCDD content by this manufacturer between 1968 and 1969. However, their technical grade 2,4,5-T still contained 2–3 ppm of TCDD in 1970. The 1970 technical samples from another manufacturer contained less than 0.5 ppm (Woolson et al. 1972). Technical grade 2,4,5-T manufactured as a formulation for use in agricultural products, typically contained 90–92% 2,4,5-T (as the acid) and 8–10 % impurities; suggesting that the sample noted above, when made into a commercial form of 2,4,5-T herbicide, probably contained between 1 and 1.5 ppm TCDD (Bovey 1980). Edmunds et al. (1973) subsequently reported on 55 samples of butyl and octyl esters of 2,4,5-T from lots manufactured in the late 1960s and early 1970s. The mean concentration of TCDD in the 55 samples was 0.31 ppm.

In 1971, in a report on 2,4,5-T prepared by the President’s Science Advisory Committee (MacLeod 1971) obtained data on TCDD levels in technical grade 2,4,5-T from one manufacturer for samples analyzed from 1958 to 1969. These data were provided in Table 5.1 . Table 5.1The history of TCDD concentrations, ppm, in technical grade 2,4,5-T acid manufactured by one company (MacLeod 1971)

Download

Copyright Disclaimer:
This site does not store any files on its server. We only index and link to content provided by other sites. Please contact the content providers to delete copyright contents if any and email us, we'll remove relevant links or contents immediately.