3-6 According to the EPA, the maximum contaminant level (MCL) of thallium in dri

Question

3-6

According to the EPA, the maximum contaminant level (MCL) of thallium in drinking water is 0.0020 mg/L. (a) Convert the MCL of thallium from miligrams 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 lested for the presence of thallium. what is the maximum amount of TI (in ug) that can be present in this 12.0 mL sample. After testing, the EPA ddetermines that, the sample of water contains 0.00089 gmL TI. is the well water safe to consume?

Explanation / Answer

a)

ppm = 0.002 mg/L

ppb = 0.002*1000 micrograms /L = 2 ppb

b)

V = 12 ml sample

max amount in micrograms

0.002 mg per liter

0.002 mg per 1000 ml

12/1000 * 0.002 = 0.000024 mg are expected so

0.000024 *1000 = 0.024 micrograms should be present

c)

V =12 ml

C = 0.00089 micrograms/ ml

change to micrograms per liter

0.00089 micrograms/ ml *1000 ml /L = 0.89 micrograms per liter

change to mg per liter

0.89 *10^-3 mg per liter

0.00089 mg/L this is less than 0.002 allowed, so this is safe to use

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