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EXTOXNET PIP- PARAQ- T Page 3 of 3 <br /> *0W 1400r <br /> stream water column of 13.1 hours[114].In another study,paraquat dichloride was stable for up to 30 days[111]. In <br /> a third study of low levels in water,paraquat had a half-life of 23 weeks[111]. <br /> Breakdown in vegetation:Paraquat dichloride droplets decompose when exposed to light after being applied to <br /> maize,tomato,and broad-bean plants. Small amounts of residues were found in potatoes treated with paraquat as a <br /> desiccant,and boiling the potatoes did not reduce the residue[8]. <br /> r <br /> Physical Properties: <br /> e Appearance:Paraquat salts are colorless,white,or pale yellow crystalline solids,which are hygroscopic and odorless <br /> [1]. <br /> a Chemical Name: 1,1'-dimethyl-4,4'-bipyridinium[1] <br /> CAS Number: 1910-42-5 <br /> a Molecular Weight:257.20 <br /> Water Solubility: 700,000 mg/L @ 20 C[1] <br /> e Solubility in Other Solvents:Dichloride salt is sparingly soluble in lower alcohols[1] <br /> e Melting Point:Decomposes @ 300 C[1] <br /> e Vapor Pressure:Negligible @ room temperature(paraquat dichloride)[1] <br /> e Partition Coefficient:4.4683 [58] <br /> AdsorptionCoefficient: 1,000,000(estimated)[I I] <br /> Exposure_Guidelines: <br /> ADI:0.004 mg/kg/day[12] <br /> MCL:Not Available <br /> e RfD:0.0045 mg/kg/day[13] <br /> e PEL:Not Available <br /> . IIA:0.03 mg/L(lifetime)[I I I] <br /> e TLV:0.1 mg/m3(8-hour)(respirable fraction)[17] <br /> Basic Manufacturer: <br /> Zeneca Ag Products <br /> 1800 Concord Pike <br /> Wilmington,DE 19897 <br /> e Phone:800-759-4500 <br /> e Emergency: 800-759-2500 <br /> r <br /> References: <br /> ... References for the information in this PIP can be found in Reference List Number 10 <br /> r <br /> DISCLAIMER:The information in this profile does not in any way replace or supersede the information on the pesticide <br /> product labeling or other regulatory requirements.Please refer to the pesticide product labeling. <br /> r <br /> http://extoxnet.orst.edu/pips/paraquat.htm 9/26/2004 <br />