Hazmat

Question 1

Define hazmat

Answer 1

portmanteau of hazardous materials

Question 2

Dosage equation

Answer 2

D = C x IR x AF x EF / BW
D=exposure dose
C= contaminate concentration mg/m-3
IR = intake of contaminated medium
AF = bioavailability factor 
EF = exposure factor
BW = body weight

or

EF = (FxED) / AT

F = frequency of exposure (days/year)
ED = expoure duration (years)
AT =averaging time (ED x 365)

Question 3

Average daily dose equation

Answer 3

ADD = C(air) x InhR x ET x EF x ED/BW x AT

ADD = Average daily dose (mg/kg-day)
Cair = Concentration of contaminant in air (mg/m3)
InhR = Inhalation rate (m3/hour)
ET = Exposure time (hours/day)
EF = Exposure frequency (days/year)
ED = Exposure duration (years)
BW = Body weight (kg)
AT = Averaging time (days)

Question 4

Workplace Exposure Limits (WEL) equation

Answer 4

WEL in mg.m-3 = (WEL in ppm x MW) / 24.05526

MW is the molecular weight (molar mass in g.mol-1) of the substance.
Molar mass is the mass of a given substance divided by the amount of that substance, measured in g/mol.
24.05526 l.mol-1 is the molar volume of an ideal gas at 20ºC and 1 atmosphere pressure (760 mm mercury, 101325 Pa, 1.01325 bar).

Question 5

Time Weighted Average (TWA) equation

Answer 5

The 8-hour reference period
The term ‘8-hour reference period’ relates to the procedure whereby the occupational exposures in any 24-hour period are treated as equivalent to a single uniform exposure for 8 hours (the 8-hour time-weighted average (TWA) exposure).

The 8-hour TWA may be represented mathematically by:

(C1T1+C2T2+…CnTn) / 8

where C1 is the occupational exposure and T1 is the associated exposure time in hours in any 24-hour period.