Evaluation of silica gel and XAD-4 as adsorbents for herbicides in air
Title:
Evaluation of silica gel and XAD-4 as adsorbents for herbicides in air
Author:
Grover, R. Kerr, L. A.
Appeared in:
Journal of environmental science and health. Part B, Pesticides, food contaminants, and agricultural wastes
Paging:
Volume 13 (1978) nr. 3 pages 311-321
Year:
1978
Contents:
Silica gel and XAD-4 resin were shown to be efficient solid adsorbents for sampling vapors of ii-butyl and iso-octyl esters of (2,4-dichlorophenoxy)acetic acid (2,4-D), ii-butyl ester of (2,4,5-trichlorophenoxy)acetic acid (2,4,5-T), octanoate ester of 3,5-dibromo-4-hydroxybenzonitrile (bromoxynil) , S (2,3,3-trichloroa-llyl)diisopropylthiocarbamate (triallate), and α,α,α-trifluoro-2, 6-dinitro-N, N-dipropyl-p-toluidine (trifluralin) herbicides in ambient air. The adsorbed herbicides were readily extracted by shaking the adsorbent with methanol or by Soxhlet extraction with a 1:1 mixture of acetone and n-hexane and subsequently analyzed with electron-capture GLC. The overall efficiencies of the two adsorbents, for both trapping and ease of extraction, were in the 85 to 100% range.
Journal description