Question

1. in the code of federal regulations reference: 40 cfr 141.62, chromium is found in cigarettes, some foods, and the air. it is also discharged from steel and pulp mills and the erosion of natural deposits. some studies suggest that in very small amounts, chromium may be essential to human beings, but it has not been proven. chromium vi or hexavalent chromium was the subject of the erin brockovich case and movie. what is the mcl and mclg for chromium?

a. 1.0 ppb
b. 10 ppb
c. 1.0 ppm
d. 0.1 ppm

1. in order to prevent methemoglobinemia (blue baby syndrome)/diuresis, ______ is monitored annually in groundwater and quarterly in surface water initially and then annually. the mcl is 10 mg/l.

a. nitrite
b. nitrate
c. sodium
d. chloride

1. microbiological contamination often causes flu - like symptoms; however, it can also

Explanation:

For Question 5:

The Maximum Contaminant Level (MCL) and Maximum Contaminant Level Goal (MCLG) for total chromium in drinking water under 40 CFR 141.62 is 0.1 ppm.

For Question 6:

Nitrate is the contaminant linked to methemoglobinemia (blue baby syndrome), with an MCL of 10 mg/L, and monitoring follows the described schedule.

Answer:

1. d. 0.1 ppm
2. b. nitrate