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EXTOXNET PIP - PROPAP,,y Page 3 of 4 <br /> Environmental Fate: <br /> • Breakdown in soil and groundwater: Propanil is of low soil persistence [58,11]. The field half- <br /> life is 1 to 3 days [58,11]. Propanil is soluble in water and it adsorbs only weakly to soil particles. <br /> Propanil is rapidly broken down in the soil by microorganisms, which have highest activity under <br /> warm, moist conditions. Bacteria produce by-products such as tetrachloroazobenzene and <br /> dichloroaniline [58]. Its rapid breakdown in soil practically eliminates the potential for <br /> groundwater contamination [I I]. <br /> • Breakdown in water: Propanil will rapidly break down in water due to microbial activity, the <br /> major breakdown pathway. Reported half-lives are 2 days under aerobic conditions and 2 to 3 <br /> days under anaerobic conditions [58]. <br /> • Breakdown in vegetation: Within a plant, propanil is moved from the leaves to the growing <br /> shoots, then back to other leaves. It is a contact herbicide. Resistant crop plants such as rice <br /> completely metabolize propanil [58]. Carry over of herbicidal activity to subsequent crops is not <br /> likely. Propanil may be highly phytotoxic to non-target plants if mixed with carbamates or <br /> organophosphates [1]. <br /> Physical Properties: <br /> • Appearance: The technical product is brownish, crystalline solid with an organic acid odor [58]. <br /> It is stable in emulsion concentrates, but is hydrolyzed in extremely acid or basic conditions [58]. <br /> • Chemical Name: 3',4'-dichloropropionanilide [1] <br /> • CAS Number: 709-98-8 <br /> • Molecular Weight: 218.08 <br /> • Water Solubility: 225 mg/L @ 25 C [1] <br /> • Solubility in Other Solvents: v.s in benzene, ethanol, acetone, and cyclohexanone; s. in toluene <br /> and xylene [1] <br /> • Melting Point: 81-91 C (technical) [1] <br /> • Vapor Pressure: 12 mPa @ 60 C [1] <br /> • Partition Coefficient: 2.2856 [1] <br /> • Adsorption Coefficient: 149 [11] <br /> Exposure Guidelines: <br /> • ADI: Not Available <br /> • MCL: Not Available <br /> • RfD: 0.005 mg/kg/day [13] <br /> • PEL: Not Available <br /> • HA: Not Available <br /> • TLV: Not Available <br /> Basic Manufacturer: <br /> Rohm and Haas Co. <br /> Agricultural Chemicals <br /> 100 Independence Mall West <br /> Philadelphia, PA 19106 <br /> • Phone: 215-592-3000 <br /> http://extoxnet.orst.edu/pips/propanil.htm 9/21/2444 <br />