The water in Fell city also contains 30 μg/L of chloroform (formed in the water treatment plant), 5 μg/L of chlorpyriphos (a persticide), and 10 μg/L of chromium VI. Given the reference doses below, calculate the total hazard quotient. State which compound is the total HQ is acceptable. References doses (all mg/kg.d): 0.01 for chloroform, 0.0003 for chlorpyiphos, and 0.003 for chromium VI.
The water in Fell city also contains 30 μg/L of chloroform (formed in the water treatment plant), 5 μg/L of chlorpyriphos (a persticide), and 10 μg/L of chromium VI. Given the reference doses below, calculate the total hazard quotient. State which compound is the total HQ is acceptable. References doses (all mg/kg.d): 0.01 for chloroform, 0.0003 for chlorpyiphos, and 0.003 for chromium VI. Answer: 0.66
Hazard quotient is the ratio of exposure concentration of the substance to that of reference concentration of the substance.
Here, the exposure concentration is expressed in the units of g/L while the concentration of reference is expressed in mg/kg.d.
So either of the units must be converted to other units to keep the units consistent.
The density of water is assumed to be 1 kg/L, Therefore, it can be considered 1 kg of water = 1 L
Conversion factor 1000 g = 1 mg.
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