Water quality index refers to the standard and scale to measure the quality of water. We know that natural water contains many impurities, and some of the impurities in it are very harmful to the ecological environment and the human body once exceeded, so the quality of water must be considered! Because the use and requirements of water in different occasions are not the same, so that the index has become a standard to measure the quality of water, to achieve its index can be used!
Four Categories of Water Quality Indicators
Physical property indicators:
solid content, turbidity, transparency, temperature, conductivity, etc.;
Chemical property index:
pH value, hardness, organic matter — carbon-based compounds (biochemical oxygen demand, chemical oxygen demand, oxygen consumption, dissolved oxygen, etc.), organic toxicants;
Biological property indicators:
number of Escherichia coli, total number of bacteria, pathogens and viruses, etc.
Other indicators:
odor, color, transparency, etc.
How to Conduct Water Quality Monitoring to Determine Whether The Water Quality Index is Qualified?
When it comes to water quality monitoring, the monitoring equipment used for different parameters is not the same. The following is a simple explanation of Moody Technology’s method of producing E. coli and biotoxicity monitoring instruments:
The WECT-900 water Escherichia coli online analyzer adopts the international standard method, and the principle that the light signal change after the reaction of enzyme and bacteria culture is proportional to the change, reflecting the total amount of bacteria or coliform bacteria in the sample. Its working principle is E. coli test technology is a biosensing technology based on E. coli detection system, it provides an effective response to water supply contamination detection means. The number of E. coli in water samples can be expressed by comparing the degree of light intensity weakening of the solution with that of a non-toxic control blank experiment.
The Modi WTox-8000 Online water Biotoxicity analyzer uses the ISO 11348 method to quickly and accurately test the toxicity of a sample based on the changes in the luminous intensity of the reaction of luminous bacteria (Vibrio Fischer) and the sample. The toxicity spectrum covers more than 5,000 potentially toxic substances.
