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E)ffOXNET PIP - PARAQUAT Page 3 of 3 <br /> Thus, paraquat does not present a high risk of groundwater contamination. Of 721 groundwater samples <br /> analyzed, only one contained paraquat, at a concentration of 20 mg/L [111]. <br /> . Breakdown;in water: Paraquat will be bound to suspended or precipitated sediment in the aquatic <br /> environment, and may be even more highly persistent than on land due to limited availability of oxygen. It <br /> had a half-life in a laboratory stream water column of 13.1 hours [114]. In another study, paraquat dichloride <br /> was stable for up to 30 days [111]. In a third study of low levels in water,paraquat had a half-life of 23 weeks <br /> [111]. <br /> . Breakdown in vegetation: Paraquat dichloride droplets decompose when exposed to light after being applied <br /> to maize, tomato, and broad-bean plants. Small amounts of residues were found in potatoes treated with <br /> paraquat as a desiccant, and boiling the potatoes did not reduce the residue [8]. <br /> Physical Properties: <br /> . Appearance: Paraquat salts are colorless,white, or pale yellow crystalline solids, which are hygroscopic and <br /> odorless [1]. <br /> . Chemical Name: 1,1'-dimethyl-4,4'-bipyridinium [1] <br /> CAS Number: 1910-42-5 <br /> . Molecular Weight: 257.20 <br />` Water Solubility: 700,000 mg/L @ 20 C [1] <br /> i . Solubility in Other Solvents: Dichloride salt is sparingly soluble in lower alcohols [1] <br /> I Melting Point: Decomposes @ 300 C [1] <br /> i Vapor Pressure: Negligible @ room temperature (paraquat dichloride) [1] <br /> . Partition Coefficient: 4.4683 [58] <br /> i AdsorptionCoefficient: 1,000,000 (estimated) [11] <br /> i <br /> Exposure Guidelines: <br /> . ADI: 0.004 mg/kg/day [12] <br /> . MCL: Not Available <br /> . RfD: 0.0045 mg/kg/day [13] <br /> . PEL: Not Available <br /> . HA: 0.03 mg/L (lifetime) [111] <br /> . 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 /> . Phone: 800-759-4500 <br /> . Emergency: 800-759-2500 <br /> References: <br /> References for the information in this PTP can be found in Reference List Number 10 <br /> 1)1SC:L A1jkIER: 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 />