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EXTOXNET PIP - GLYPHOSATE Page 3 of 4 <br /> Environmental=Fate: <br /> . Breakdown in soil and groundwater: Glyphosate is moderately persistent in soil, with an estimated average half- <br /> life <br /> alflife of 47 days [58,11]. Reported field half-lives range from 1 to 174 days [11]. It is strongly adsorbed to most soils, <br /> even those with lower organic and clay content [11,58]. Thus, even though it is highly soluble in water, field and <br /> laboratory studies show it does not leach appreciably, and has low potential for runoff(except as adsorbed to <br /> colloidal matter) [3,11]. One estimate indicated that less than 2% of the applied chemical is lost to runoff[99]. <br /> Microbes are primarily responsible for the breakdown of the product, and volatilization or photodegradation losses <br /> will be negligible [58]. <br /> . Breakdown in water: In water, glyphosate is strongly adsorbed to suspended organic and mineral matter and is <br /> broken down primarily by microorganisms [6]. Its half-life in pond water ranges from 12 days to 10 weeks [97]. <br /> . Breakdown in vegetation: Glyphosate may be translocated throughout the plant, including to the roots. It is <br /> extensively metabolized by some plants, while remaining intact in others [1]. <br /> Physical Properties: <br /> . Appearance: Glyphosate is a colorless crystal at room temperature [I]. <br /> . Chemical Name: N-(phosphonomethyl) glycine [1] <br /> . CAS Number: 1071-83-6 <br /> . Molecular Weight: 169.08 <br /> . Water Solubility: 12,000 mg/L @ 25 C [1] <br /> • Solubility in Other Solvents: i.s. in common organics (e.g., acetone, ethanol, and xylene) [I] <br /> . Melting Point: 200 C [1] <br /> . Vapor Pressure: negligible [1] <br /> . Partition Coefficient: -3.2218 - -2.7696 [58] <br /> . Adsorption Coefficient: 24,000 (estimated) [1I] <br /> Exposure Guidelines: <br /> . ADI: 0.3 mg/kg/day [12] <br /> . MCL: Not Available <br /> . RfD: 0.1 mg/kg/day [13] <br /> . PEL: Not Available <br /> . HA: 0.7 mg/L (lifetime) [98] <br /> . TLV: Not Available <br /> Basic Manufacturer: <br /> Monsanto Company i <br /> 800 N. Lindbergh Blvd. <br /> St. Louis, MO 63167 <br /> . Phone: 314-694-6640 <br /> . Emergency: 314-694-4000 <br /> References: <br /> References for the information in this PIP can be found in Reference List Ntii.:njher 10. <br /> http://extoxnet.orst.edu/pips/glyphosa.htm 1/18/2007 <br /> l <br />