Nowadays, environmental protection has caused public concerns where water pollution is an important environmental protection problem. It's necessary to test the water supplies for production and daily life to protect the water resources essential for human beings and secure drinking water hygiene. Water analyzer has a wide application in power station, waste water treatment plant, textile mill, pharmaceutical factory, environmental protection administration, epidemic prevention department and hospital. It can measure all kinds of water quality parameters, including organic pollutant, nutritive salt, metal and inorganic anions. The below will introduce how the water analyzer test the water quality.
Ammonia nitrogen in water mainly comes from catabolite of nitrogenous organic compound in sanitary sewage subjected to microbial action and industrial effluents, such as coking wastewater, ammonia fertilizer plant water and agricultural drainage. Besides, nitrite existing in water in oxygen free environment can revert to ammonia under microbial action. In aerobic environment, ammonia can transform to nitrite or even nitrate.
It's beneficial to measure ammonia in various forms in water to assess the contaminated situation and natural cleaning. Higher content of ammonia gas will have toxic action on fish. Using ammonia analyzer, able to effectively monitor the ammonia content in water, has great influence on water monitoring. Ammonia analyzer tests ammonia by salicylic acid method which has simple operation and high sensitivity.
Total nitrogen analyzer mainly adopts rapid spectrophotometric method to measure total phosphorus in water, namely ammonium molybdate spectrophotometric method. Its treatment process is mainly divided into two steps:
1) Potassium persulfate is added to the water sample as an oxidant under neutral conditions, and the sample was continuously heated for 30 minutes at a constant temperature of 125 ° C. All the phosphorus in the water sample is converted into phosphate salts;
2) The water sample, which was previously formed orthophosphate, was reacted with ammonium molybdate and antimony tartrate potassium oxide in the acidic medium to form molybdophosphate heteropoly acid, which was reduced by reducing agent ascorbic acid and finally turned into a blue complex.
After the above two steps, the physical colorimetric method is used to obtain a transmittance of the water sample, and then the microcomputer technology is used to analyze and calculate the transmittance, finally getting the total phosphorus content in the water sample.
Total nitrogen is an important index of water detection with complex measurement and easy to cause deviation. New generation toc applies KPS UV spectrophotometric to test the nitrogen in water.
New generation toc takes KPS as the oxidant to digest water in high temperature and pressure with color matching of 210nm and 228nm double wavelength UV. It has high range and low range, which can be accurately measured as 0.5-150mg/L N. The device is composed of automatic sampler, analysis unit and controller. Without any need of artificial interference for the whole analysis, the analyzer can automatically finish sample introduction, digestion, cooling, color matching and drainage. It can save the analysis result automatically which can be referred by users through the controller.