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Details for article 6 of 6 found articles
| Title: |
Residues of 2,4-D in air samples from Saskatchewan: 1966-1975 |
| Author: |
Grover, R. Kerr, L. A. Wallace, K. Yoshida, K. Maybank, J. |
| Appeared in: |
Journal of environmental science and health. Part B, Pesticides, food contaminants, and agricultural wastes |
| Paging: | Volume 11 (1976) nr. 4 pages 331-347 |
| Year: |
1976 |
| Contents: |
Residues of 2,4-D (2,4-dichlorophenoxyacetic acid) in air samples from several sampling sites in central and southern Saskatchewan during the spraying seasons in the 1966-68 and 1970-75 periods were determined by gas-liquid Chromatographic techniques. Initially, individual esters of 2,4-D were characterized by retention times and confirmed further by co-injection and dual column procedures. Since 1973, however, only total 2,4-D acid levels in air samples have been determined after esterification to the methyl ester and confirmed by gc/ms techniques whenever possible. Up to 50% of the daily samples collected during the spraying season at any of the locations and during any given year contained 2,4-D, with butyl esters being found most frequently. The daily 24-hr mean atmospheric concentrations of 2,4-D ranged from 0.01 to 1.22 μg/m3, 0.01 to 13.50 μg/m3, and 0.05 to 0.59 μg/m for the iso-propyl, mixed butyl and iso-octyl esters, respectively. Even when the samples were analysed for the total 2,4-D content, i.e. from 1973 onwards, the maximum level of the total acid reached only 23.14 μg/m. In any given year and at any of the sampling sites, about 30% of the samples contained less than 0.01 μg/m3 of 2,4-D. In another 40% of the samples, the levels of 2,4-D ranged from 0.01 to 0.099 yg/m. Only about 30% of the samples contained 2,4-D concentrations higher than 0.1 μg/m3, with only 10% or less exceeding 1 μg/m3. None of the samples, obtained with the high volume particu-late sampler, showed any detectable levels of 2,4-D, indicating little or no transport of 2,4-D adsorbed on dust particles or as crystals of amine salts. |
| Publisher: |
Taylor & Francis |
| Source file: |
Elektronische Wetenschappelijke Tijdschriften |
Details for article 6 of 6 found articles
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