According to the EPA, the maximum contaminant level (MCL) of antimony in drinkin

Question

According to the EPA, the maximum contaminant level (MCL) of antimony in drinking water is 0.0060 mg/L. (a) Convert the MCL of antimony from milligrams per liter to parts per billion (ppb). (b) A farmer has recently dug a new well for his property. He sends a 12.0 mL sample of the well water to the EPA to be tested for the presence of antimony. What is the maximum amount of Sb (in mug) that can be present in this 12.0 mL sample based on its MCL? (c) Suppose the farmer has rethought his plan and dug a new well on the other side of his property. He sends a new 12.0 mL sample. After testing, the EPA determines that the sample of water contains 0.00188 mug/mL Sb. Is the well water safe to consume?

Explanation / Answer

1)

ppb = microgram / L = 10^-6 grams / L

0.006*10^3 mg / L = 6microgram / L

ppb = 6

2)

V = 12 ml

max

6 micrograms / L = 6 micrograms / 1000 ml = 6*10^-3 ug / ml

V = 12 ml so

12*6*10^-3 = 0.072 ug

3)

if

C = 0.00188 ug / ml

is it safe?

from before: 6*10^-3 ug / ml is hte limit

0.006 ug /ml

meaning that

0.00188 < 0.006

this is safe to use

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