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Permissible Exposure Levels for Selected Military Fuel Vapors
Appendix A
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This page in the original is blank.
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PROGRAM: MODEL FOR TWO VOLATILE ORGANICS (PEL.CSL)
'PHYSIOLOGICALLY BASED MODELING OF HEXANE'
'AND TOLUENE FOR SUBCOMMITTEE ON PERMISSIBLE'
'EXPOSURE LEVELS FOR MILITARY FUELS'
'THIS PROGRAM DESCRIBES COMPETITIVE, NONCOMPETITIVE,'
'AND UNCOMPETITIVE INHIBITION IN THE METABOLISM OF TWO'
'VOLATILE ORGANIC CHEMICALS, HEXANE AND TOLUENE'
INITIAL
'Physiological parameters'
CONSTANT
QPC=15.
CONSTANT
QCC=15.
CONSTANT
VLC=0.04
CONSTANT
VFC=0.20
CONSTANT
QLC=0.25
CONSTANT
QFC=0.09
CONSTANT
BW=80
'Partition coefficients; 1=HEXANE, 2=TOLUENE'
CONSTANT
PL1=2.27
CONSTANT
PL2=4.64
CONSTANT
PF1=69.4
CONSTANT
PF2=56.7
CONSTANT
PS1=1.27
CONSTANT
PS2=1.54
CONSTANT
PR1=2.27
CONSTANT
PR2=4.64
CONSTANT
PB1=2.29
CONSTANT
PB2=18
'Biochemical Parameters; 1=HEXANE 2=TOLUENE'
CONSTANT
VMAXC1=3.0
CONSTANT
VMAXC2=7.5
CONSTANT
KM1=0.3
CONSTANT
KM2=0.3
CONSTANT
KMI1=0.3
CONSTANT
KMI2=0.3
CONSTANT
KM21=1E6
CONSTANT
KM12=1E6
CONSTANT
CONC1=150. $'Concentration in mg/m3 or ug/L'
CONSTANT
CONC2=150.
CONSTANT
MW1=88
CONSTANT
MW2=92
CONSTANT
KL1=0.
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Permissible Exposure Levels for Selected Military Fuel Vapors
CONSTANT
KL2=0.
AIO1=CONC1/MW1
$'Initial concentration in umoles/L'
AIO2=CONC2/MW2
'** TIMING COMMANDS'
SCHEDULE DS1 .AT. TCHNG
CIZONE=1.
CONSTANT
TCHNG=8.
CONSTANT
TSTOP=48.
CONSTANT
POINTS=50.
CINT=TSTOP/POINTS
'SCALED PARAMETERS'
QC
= QCC*BW**0.74
QP
= QPC*BW**0.74
VMAX1
= VMAXC1*BW**0.7
VMAX2
= VSAXC2*BW**0.7
QL
= QLC*QC
QF
= QFC*QC
QS
= 0.24*QC-QF
QR
= 0.76*QC-QL
VL
= VLC*BW
VS
= 0.82*BW-VF
VR
= 0.09*BW-VL
END $'END OF INITIAL'
DYNAMIC
ALGORITHM IALG=2
DISCRETE DS1
CIZONE=0
CALL LOGD (.TRUE.)
END
DERIVATIVE
'COMPOUND 1'
'CI = CONCENTRATION IN INHALED AIR (UMOLE/L)'
RAI1 = QP*CI1
AI1 = INTEG(RAI1,0.)
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CI1 = AIO1*CZONE
'AB = AMOUNT IN LUNG BLOOD COMPARTMENT (UMOLE)'
CA1 = (QC*CV1+QP*CI1)/(QP/PB1+QC)
CX1 = CA1/PB1
AUCB1= INTEG(CA1,.0001)
'AX = AMOUNT EXHALED (UMOLE)'
RAX1 = QP*CX1
AX1 = INTEG(RAX1,.0001)
'AF = AMOUNT IN FAT COMPARTMENT (UMOLE)'
RAF1 = QF*(CA1-CVF1)
AF1 = INTEG(RAF1,.0001)
CVF1 = AF1/(VF*PF1)
CF1 = AF1/VF
'AL = AMOUNT IN LIVER COMPARTMENT (UMOLE)'
RAL1 = QL*(CA1-CVL1)-RAM1
AL1 = INTEG(RAL1,.0001)
CVL1 = AL1/ (VL*PL1)
CL1 = AL1/VL
'AS = AMOUNT IN SLOWELY PERFUSED TISSUES (UMOLE)'
RAS1 = QS*(CA1-CVS1)
AS1 = INTEG(RAS1,.0001)
CVS1 = AS1/(VS*PS1)
CS1 = AS1/VS
'AR = AMOUNT IN RAPIDLY PERFUSED TISSUES (UMOLE)'
RAR1 = QR* (CA1-CVR1)
AR1 = INTEG(RAR1,.0001)
CVR1 = AR1/(VR*PR1)
CR1 = AR1/VR
'AM = AMOUNT METABOLIZED (UMOLE)'
RAM1 = (VAMX1*CVL1)/KM1*DEN1+CVL1*DEN2)
DEN1 = 1.+CVL2/KMI2
DEN2 = 1.+CVL2/KM21
AM1 = INTEG(RAM1,.0001)
'CV = MIXED VEMOUS BLOOD CONCENTRATION (UMOLE)'
CV1 = (QF*CVF1 + QL*CVL1 + QS*CVS1 + QR*CVR1)/QC
'COMPOUND 1'
'CI = CONCENTRATION IN INHALED AIR (UMOLE/L)'
RAI2 = QP*CI2
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AI2 = INTEG(RAI2,0.)
CI2 = AIO2*CZONE
'AB = AMOUNT IN LUNG BLOOD COMPARTMENT (UMOLE)'
CA2 = (QC*CV2+QP*CI2)/(QP/PB2+QC)
CX2 = CA2/PB2
AUCB2= INTEG(CA2,.0001)
'AX = AMOUNT EXHALED (UMOLE)'
RAX2 = QP*CX2
AX2 = INTEG(RAX2, .0001)
'AF = AMOUNT IN FAT COMPARTMENT (UMOLE)'
RAF2 = QF* (CA2-CVF2)
AF2 = INTEG(RAF2,.0001)
CVF2 = AF2/(VF*PF2)
CF2 = AF2/VF
'AL = AMOUNT IN LIVER COMPARTMENT (UMOLE)'
RAL2 = QL*(CA2-CVL2)-RAM2
AL2 = INTEG(RAL2, .0001)
CVL2 = AL2/(VL*PL2)
CL2 = AL2/VL
'AS = AMOUNT IN SLOWELY PERFUSED TISSUES (UMOLE)'
RAS2 = QS*(CA2-CVS2)
AS2 = INTEG(RAS2,.0001)
CVS2 = AS2/(VS*PS2)
CS2 = AS2/VS
'AR = AMOUNT IN RAPIDLY PERFUSED TISSUES (UMOLE)'
RAR2 = QR*(CA2-CVR2)
AR2 = INTEG(RAR2,.0001)
CVR2 = AR2/(VR*PR2)
CR2 = AR2/VR
'AM = AMOUNT METABOLIZED (UMOLE)'
RAM2 = (VAMX2*CVL2)/KM2*DEN3+CVL2*DEN4)
DEN3 = 1.+CVL1/KMI1
DEN4 = 1.+CVL1/KM12
AM2 = INTEG(RAM2,.0001)
'CV = MIXED VEMOUS BLOOD CONCENTRATION (UMOLE)'
CV2 = (QF*CVF2 + QL*CVL2 + QS*CVS2 + QR*CVR2)/QC
TERMT(T.GT.TSTOP)
END $'END OF DERIVATIVE'
END $'END OF DYNAMIC'
END $'END OF PROGRAM'
Representative terms from entire chapter:
perfused tissues
