. According to a classification scheme(2), this BCF suggests the potential for bioconcentration in aquatic organisms is moderate(SRC). The respective BCF values for the fillet and viscera tissues in the bluegill fish study were 28 and 84(1), also indicative of a moderate potential for bioconcentration(SRC). However, the compound used in the study consisted of only the B1a (present at not more than 20% in abamectin) form of avermectin; the B1b form was not utilized.
[(1) Vandenheuvel WJA et al; Environ Toxicol Chem 15: 2263-2266 (1996) (2) Franke C et al; Chemosphere 29: 1501-14 (1994)] **PEER REVIEWED**


Soil Adsorption/Mobility:
The Koc of abamectin is reported as 5000(1). According to a classification scheme(2), this Koc value suggests that abamectin is expected to be immobile in soil.
[(1) Augustijn-Beckers PWM et al; Rev Environ Contam Toxicol 137: 1-82 (1994) (2) Swann RL et al; Res Rev 85: 17-28 (1983)] **PEER REVIEWED**


Volatilization from Water/Soil:
The Henry's Law constant for abamectin (B1a form of the avermectin only) is estimated as 1.7X10-7 atm-cu m/mole(SRC) based upon its vapor pressure, 1.5X10-9 mm Hg(1), and water solubility, 0.01 mg/l(1). This Henry's Law constant indicates that abamectin is expected to be essentially nonvolatile from water surfaces(2). Abamectin's is not expected to volatilize from moist soil surfaces(SRC) based upon its estimated Henry's Law constant. Abamectin is not expected to volatilize from dry soil surfaces(SRC) based upon its vapor pressure(1).
[(1) Budavari S, ed; The Merck Index. 12th ed Whitehouse Station, NJ: Merck and Co., Inc., p. 1 (1996) (2) Lyman WJ et al; Handbook of Chemical Property Estimation Methods. Washington, DC: Amer Chem Soc pp. 15-1 to 15-29 (1990)] **PEER REVIEWED**


Atmospheric Concentrations:
INDOOR: Abamectin was detected in indoor air samples collected from food-preparation, serving and dining areas of three dining facilities at Ft. Bragg, NC during Sept to Dec 1989 following application of the 0.05% dust formulation to cracks and crevices at 32-45 mg total application(1). Abamectin was initially detected in the air at 901 ng/cu m, decreased to 308 and 100 ng/cu m by 1 and 3 days posttreatment, respectively, and was 0.5-2 ng/cu m at 7-90 days(1). It is noted that no heating or air conditioning was used in the dining facilities during the study. Abamectin was not detected above the method detection limit (20.3 ng/l) in indoor air samples from a 35-yr old hotel in California collected during the spring of 1995 up to 12 hours following crack and crevice treatment at total applications of 4.8 to 58.7 mg abamectin(2). The study was designed to represent a worst-case venue; air conditioning was not utilized during the study.
[(1) Wright CG et al; Bull Environ Contam Toxicol 49: 171-8 (1992) (2) Krieger RI et al; Bull Environ Contam Toxicol 58: 681-7 (1997)] **PEER REVIEWED**


Food Survey Values:
Abamectin was detected in uncovered bread and lettuce samples placed on a food s