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Title:   Author  item
                                            JAYASUNDERA, SHALINI - UMDitem
                                            Schmidt, Walteritem
                                            Hapeman, Cathleenitem
                                            TORRENTS, ALBA - UMD
  Submitted to: American Chemical Society National Meeting
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 7/15/1999
                                    Publication  Date: N/A
                                    Citation: N/AInterpretive Summary:
                                Technical Abstract: The dynamics of acetamide pesticide interactions between metolochlor or acetanilide as a probe compound and soil organic matter (OM) surrogates were studied using Nuclear Magnetic Resonance Spectroscopy. The 13 C and 1H relaxation times were measured to investigate and identify the specific sites within the ligand and substrate molecules at which interactions  occurred. T1 and T2 relaxation times were determined as a function of the colloidal OM concentration. Decrease in T1 at specific sites of acetamide molecules, with OM concentration was a function of the properties of the OM. The rate of decrease in T1 when interacting with the less polar lignin was larger than with the more polar cellulose. Changes in relaxation were correlated to calculated and experimentally determined binding coefficients (K(oc)). NMR parameter changes at specific sites together with experimentally determined thermodynamic parameters suggests that acetamide  pesticides form weak hydrophobic interactions with lignin and more specifi and relatively stronger hydrogen bonding type interactions with chitin and cellulose.


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