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EXTOXNETPIP- GLYPHOSATE <br /> Page 3 o <br /> Environmental Fate: <br /> • Breakdown in soil and groundwater: Glyphosate is moderately persistent in soil, with an estimated average half <br /> life of 47 days [58,11]. Reported field half-lives range from 1 to 174 days [11]. It is strongly adsorbed to most soil <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 [1]. <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) [1] <br /> • Melting Point: 200 C [I] <br /> • Vapor Pressure: negligible [1] <br /> • Partition Coefficient: -3.2218 - -2.7696 [58] <br /> • Adsorption Coefficient: 24,000 (estimated) [11] <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 <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 Number 10 <br /> http://extoxnet.orst.edu/pips/glyphosa.htm 6/21/200 <br />