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EXYOXNET PIP - METHIDATHION Page 3 of 3 <br /> :. probably due to the short half-life of the compound and its degradates. <br /> . Breakdown-in water: No data are currently available. <br /> . Breakdown in vegetation: In plants, methidathion is rapidly metabolized [13]. Oranges sprayed with <br /> Supracide at a rate of nearly 2 pounds per acre had residues of the compound of about 0.1 ug/ml [81]. Within <br /> 2 days over 60% of the compound was removed from the outside of the fruit, and within I week, Iess than 1% <br /> I of the compound remained [81]. <br /> Physical Properties: <br /> I . Appearance: Methidathion is a colorless crystalline compound at room temperature [13]. <br /> . Chemical Name: S-2,3-dihydro-5-methoxy-2-oxo-1,3,4-thiadiazol-3-ylmethyl O,O- <br /> dimethylphosphorodithioate [13] <br /> . CAS Number: 950-37-8 <br /> . Molecular Weight: 302.33 <br /> . Water Solubility: 240 mg/L @ 20 C [13] <br /> . Solubility in Other Solvents: v.s. in octanol, ethanol, xylene, acetone, and cyclohexane [13] <br /> . Melting Point: 39.5 C [13] <br /> . Vapor Pressure: 186 mPa @ 20 C [13] <br /> . Partition Coefficient: 4.7243 [8] <br /> . Adsorption Coefficient: 400 (estimated) [19] <br /> Exposure Guidelines: <br /> . ADI: 0.001 mg/kg/day [38] <br /> . MCL: Not Available <br /> . RfD: 0.001 mg/kg/day [53] <br /> . PEL: Not Available <br /> . HA: Not Available <br /> . TLV: Not Available <br /> Basic Manufacturer: <br /> Ciba-Geigy Corporation <br /> P.O. Box 18300 <br /> Greensboro,NC 27419-8300 <br /> . Phone: 800-334-9481 <br /> E . Emergency: 800-888-8372 <br /> I <br /> f <br /> References: <br /> References for the information in this PIP can be found in Reference List Number 5 <br /> D1SC'LAITYIIF-- : The information in this profile does not in any way replace or supersede the information on the <br /> pesticide product labeling or other regulatory requirements. Please refer to the pesticide product labeling. <br />