Nitrite concentration in a typical wastewater treatment plant effluent is less than 0.5 mg/L as NO2-N.

Nitrite concentration in a typical wastewater treatment plant effluent is less than 0.5 mg/L as NO2-N.

• A. This concentration is greater than 5 mg/L as NO2-N.
• B. This concentration is not measurable.
• C. This concentration is less than 0.5 mg/L as NO2-N.
• D. This concentration is exactly 1 mg/L as NO2-N.

Answer: (C)