Nova-Tech DO 700 - Manual (Page 28)

22
Some pollutants such as acid mine drainage produce direct chemical
demands on oxygen in the water. DO is consumed in the oxidation-
reduction reactions of introduced chemical compounds such as nitrate
(NO
3
1-
) and ammonia (NH
4
1+
), sulfate (SO
4
2-
), and sulfite (SO
3
2-
) and
ferrous (Fe
2
+
) and ferric (Fe
3
+
) ions.
These are important consideration for water and wastewater treatment
industry.