Water pollution inspection is a process of monitoring the types of pollutants in the water body, the concentration and changing trend of various pollutants, and evaluating the water quality. The monitoring is extensive, including uncontaminated and contaminated natural water (river, lake, sea and groundwater) and various industrial drainage. The main monitoring items can be divided into three categories: comprehensive indicators, toxic substances and radioactive pollution. At present, China's water environment water pollution inspection technology has obtained a rapid development.
Ø Acute toxicity test of water quality
The acute toxicity test of water quality (luminescent bacteria method) is convenient for field rapid detection. A group of bacteria that emit blue-green fluorescent light (similar to that of fireflies) is used. The luminous intensity of this kind of bacteria is constant and stable under stable conditions, and will react "sensitively" once encountering external adverse factors (e.g., when encountering toxic substances), usually showing that the luminous value is suppressed. The degree of suppression correlates with the concentration of the toxic substance and its toxicity. The degree of luminescence suppression of light-emitting bacteria is detected by photoelectric sensor, and the acute toxicity of water quality is calculated according to the change of detection signal.
Ø Detection of radioactive pollution in water
The radioactive pollution in domestic water is mainly α and β radioactive sources, while the radioactive pollution in seawater is mainly α, β and γ radioactive sources. The artificial radionuclide in the ocean refers to the radioactive nuclides which enter the ocean due to the utilization of nuclear energy, such as nuclear reactors, nuclear weapons and nuclear power ships. In general, the activity of radionuclides in marine environment is very low, generally 1~104Bq/kg or 1~104Bq/L. In the event of an accident, the nuclear power plant releases radionuclides to the environment. Monitoring the type and total amount of nuclides released from the nuclear accident is the key to monitoring nuclear contamination. Generally speaking, 90Sr, 110mAg, 131I, 134Cs, 137Cs, 239Pu, 58Co, 60Co, 54Mn and so on are commonly released in different nuclear accidents. Therefore, it is very important to monitor the change in activity of these nuclides quickly in the nuclear accident.
BEIJING HAMAMATSU PHOTON TECHNIQUE INC. can not only provide scintillators, PMTs and scintillation detectors for water quality radioactive index detection, but also provide instruments for acute toxicity detection of water quality (luminescent bacteria method). The product interface is friendly, easy to operate, and provides multiple test modes for customers to choose according to their requirements.
