Water quality monitoring is to monitor and measure the types of pollutants in water, the concentration and change trend of various pollutants. The main monitoring items can be divided into two categories: one is the comprehensive index reflecting the water quality, such as temperature, chroma, turbidity, pH value, conductivity, suspended solids, dissolved oxygen, chemical oxygen demand and biochemical oxygen demand; the other is some toxic substances, such as phenol and cyanogen As, Pb, Cr, CD, Hg and organic pesticides.
