27 Determination of the Release of Bound Fluchloralin Residues from Soil into Water GARY M. BOOTH and R. WARD RHEES Brigham Young University, Provo, Utah 84601 DUANE F E R R E L L Thompson-Hayward Chemical Co., Kansas City, Kans. 66110
Downloaded by CORNELL UNIV on June 2, 2017 | http://pubs.acs.org Publication Date: June 1, 1976 | doi: 10.1021/bk-1976-0029.ch027
J. R. LARSEN University of Illinois, Urbana, Ill. 61801 The objectives of this study were: (1) to determine the total extractable and non-extractable residues from aged soil, (2) to identify the soil residues that were extractable in organic solvents, (3) to determine the rate of release of the total bound residues in the aquatic environment followed as a function of time, (4) to investigate the effects of s t e r i l e versus non-sterile soil and photoperiod changes on the above objectives. Aged soil (18 months) which had been treated with C-fluchloralin (N-[2-chloroethyl]-2,6-dinitro-N-propyl-4-[tri= fluoromethyl]aniline) was supplied by BASF Wyandotte Corporation. Determination of total C was obtained by a Harvey Biological Material Oxidiser (BMO). The BMO was used to calculate the total residues and then the aged soil was exhaustively extracted until no more residues were obtained. In practice, the aged soil was exhaustively extracted 3X with methanol (MeOH) and then repeated using hexane (1000 ml solvent/400 g soil/extract). The extracts were then subjected to thin layer chromatography analysis for a material balance. The results of the combustion data showed that the X dpm/g = 4025 + 584. No residues could be recovered using hexane. The MeOH extraction showed that 14.73% of the total residues could be extracted with MeOH leaving 85.27% as total C bound residues (TBR). The residues from the MeOH extracts were examined by thin layer chromatography (tlc) and the parent compound, Fluchloralin accounted for 76.38% of the total MeOH extracted residues from the aged soil. The determination of the release of the TBR from the soil into water was followed by combusting soil samples and analyzing water samples at selected intervals over a 128 day period. In general, the data showed that varying regimens of photoperiod and s t e r i l i t y had little effect on the release of the TBR. A possible exception to this might be the tanks that were subjected to 24 hours dark: non-sterile soil, which were consistently lower in ppm than the other treatments. 14
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Kaufman et al.; Bound and Conjugated Pesticide Residues ACS Symposium Series; American Chemical Society: Washington, DC, 1976.
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A n a l y s i s o f the water over time showed t h a t low concent r a t i o n s o f the TBR were r e l e a s e d i n t o water w i t h the values remaining r a t h e r constant a f t e r day 16. F l u c h l o r a l i n accounted f o r about 85% o f the t o t a l r e s i d u e s r e l e a s e d i n t o the water.
Kaufman et al.; Bound and Conjugated Pesticide Residues ACS Symposium Series; American Chemical Society: Washington, DC, 1976.
