Sethoxydim Risk Assessment
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- Bu səhifədəki naviqasiya:
- Worksheet C01b
- Acres ) Central 16 acres/hour USDA 1989a,b,c. Lower 11 Upper 21 Acres treated per day ( ATD ): Hrs × Acres
- NOTE: T HE F OREST S ERVICE WILL NOT USE AERIAL APPLICATIONS . T HIS WORKSHEET IS INCLUDED AS A
- Acres ) Central 70 acres/hour USDA 1989a,b,c Lower 40 Upper 100 Acres treated per day ( ATD ): Hrs × Acres
- Worksheet C02a
- Worksheet C02b
Worksheet C01b: Worker exposure estimates for boom spray (hydraulic ground spray) applications of sethoxydim [WkHyExp01] Verbal Description: The absorbed dose for the worker is calculated from the amount handled per day and the generic absorbed dose rate from several field studies on worker applications of a number of herbicides. The amount handled per day is calculated from the application rates as well as estimates of the hours worked per day and acres treated per hour. Parameter/Assumption Value Units Source/Designation Application rates (R) Central 0.3 lb/acre APPL.TYP Lower 0.09375 APPL.LOW Upper 0.375 APPL.HI Hours of application per day (Hrs) Central 7 hours USDA 1989a,b,c Lower 6 Upper 8 Acres_)_Central_16_acres/hour_USDA_1989a,b,c._Lower_11_Upper_21_Acres_treated_per_day_(_ATD_):_Hrs_×_Acres'>Acres treated per hour (Acres) Central 16 acres/hour USDA 1989a,b,c. Lower 11 Upper 21 Acres treated per day (ATD): Hrs × Acres Central 112 acres/day Lower 66 Upper 168 Amount handled per day (AHD): R × ATD Central 33.6 lb/day Lower 6.1875 Upper 63 Absorbed dose rate (ADR) Central 0.0002 (mg agent/kg bw) SERA 2001 ÷ (lbs agent Lower 0.00001 handled per day) Upper 0.0009 Absorbed dose [D Abs ]: AHD × ADR Central 6.72e-03 mg/kg bw/day Lower 6.19e-05 Upper 5.67e-02 WS-19 NOTE: T HE F OREST S ERVICE WILL NOT USE AERIAL APPLICATIONS . T HIS WORKSHEET IS INCLUDED AS A PLACE - HOLDER BUT THE RESULTS OF THE CALCULATIONS ARE NOT INCLUDED IN THE SUMMARY TABLES - I . E ., W ORKSHEETS E01 AND E02. Worksheet C01c: Worker exposure estimates for aerial applications of sethoxydim [WKAREXP01] Verbal Description: The absorbed dose for the worker is calculated from the amount handled per day and the generic absorbed dose rate from several field studies on worker applications of a number of herbicides (SERA 2001). The amount handled per day is calculated from the application rates as well as estimates of the hours worked per day and acres treated per hour. Parameter/Assumption Value Units Source/Designation Application rates (R) Central 0.3 lb/acre Appl.Typ Lower 0.09375 Appl.Low Upper 0.375 Appl.Hi Hours of application per day (Hrs) Central 7 hours USDA 1989a,b,c Lower 6 Upper 8 Acres treated per hour (Acres) Central 70 acres/hour USDA 1989a,b,c Lower 40 Upper 100 Acres treated per day (ATD): Hrs × Acres Central 490 acres/day Lower 240 Upper 800 Amount handled per day (AHD): R × ATD Central 147 lb/day Lower 22.5 Upper 300 Absorbed dose rate (ADR) Central 0.00003 (mg agent/kg bw) SERA 2001 ÷ (lbs agent Lower 0.000001 handled per day) Upper 0.0001 Absorbed dose [D Abs ]: AHD × ADR Central 4.41e-03 mg/kg bw Lower 2.25e-05 Upper 3.00e-02 WS-20 Worksheet C02a: Workers: Accidental Dermal Exposure Assessments Using Zero-Order Absorption Wearing Contaminated Gloves for One Minute [WrkDrmZr01] Verbal Description: Dermal absorption is calculated using the zero-order model from U.S. EPA/ORD (1992): Dose (mg/kg) = Kp × C × Time × S ÷ W Each of the above terms are described below. Parameter Value Units Source Body weight (W) 70 kg STD.BW Surface Area of hands (S) 840 cm 2 STD.Hands Dermal permeability (K p ) Central 0.00027 cm/hour DERM.KpC Lower 0.00017 cm/hour DERM.KpL Upper 0.00042 cm/hour DERM.KpU Concentration in solution (C) 1 Central 3.6 mg/mL APPL.TypDr Lower 0.56 mg/mL APPL.LowDr Upper 9 mg/mL APPL.HI_Dr Duration of Exposure (T) 0.0167 hours 1÷60 Absorbed Dose (D Abs ): Kp × C × T × S ÷ W Central 1.94e-04 mg/kg Lower 1.90e-05 mg/kg Upper 7.56e-04 mg/kg 1 Note that 1 mL is equal to 1 cm 3 and thus mg/mL = mg/cm 3 . WS-21 Worksheet C02b: Workers: Accidental Dermal Exposure Assessments Using Zero-Order Absorption Wearing Contaminated Gloves for One Hour [WrkDrmZr60] Verbal Description: Dermal absorption is calculated using the zero-order model from U.S. EPA/ORD (1992): Dose (mg/kg) = Kp × C × Time × S ÷ W Each of the above terms are described below. Parameter Value Units Source Body weight (W) 70 kg STD.BW Surface Area of hands (S) 840 cm 2 STD.Hands Dermal permeability (K p ) Central 0.00027 cm/hour DERM.KpC Lower 0.00017 DERM.KpL Upper 0.00042 DERM.KpU Concentration in solution (C) 1 Central 3.6 mg/mL APPL.TypDr Lower 0.56 APPL.LowDr Upper 9 APPL.HI_Dr Duration of Exposure (T) 1 hours Absorbed Dose (D Abs ): Kp × C × T × S ÷ W Central 1.17e-02 mg/kg bw Lower 1.14e-03 Upper 4.54e-02 1 Note that 1 mL is equal to 1 cm 3 and thus mg/mL = mg/cm 3 . WS-22 Yüklə 4,8 Kb. Dostları ilə paylaş:
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