Selenium is an essential element of the human body, if the lack of selenium will have an impact on health, more than 40 diseases of the human body are related to selenium deficiency, such as: liver disease, cataracts, diabetes and so on. Is it so that the selenium content of water no matter how much do not have to pay attention to it? This chapter water quality online monitoring instrument manufacturers to understand together with you the harm caused by excessive water and water quality online monitoring.
What are the Dangers of Selenium in Water?
Excessive intake of selenium can lead to selenium poisoning, which can be divided into acute selenium poisoning and chronic poisoning.
Acute poisoning usually occurs after the intake of a large amount of high selenium substances, intake of 400 to 800 mg/kg body weight per day can lead to chronic poisoning. The main manifestations were abnormal movement and pathological posture, dyspnea, flatulence, high fever, rapid pulse, collapse and death due to respiratory failure. Most of the fatal poisonings were preceded by direct myocardial inhibition and intractable hypotension caused by peripheral vasodilation. Its characteristic symptoms are garlic or sour breath, nausea, vomiting, abdominal pain, irritability, excessive salivation, and muscle cramps.
Chronic selenium poisoning is often due to the daily intake of 2400 to 3000 micrograms of selenium from food, as long as several months before symptoms appear. The symptoms include hair loss, removal of nails, yellow skin, bad breath, fatigue, increased susceptibility to dental caries, and depression. General chronic selenium poisoning have dizziness, headache, fatigue and weakness, metal taste in the mouth, nausea, vomiting, loss of appetite, diarrhea, breath and sweat have garlic odor, but also have hepatomegaly, liver function abnormalities, autonomic nervous dysfunction, urine selenium increased. Long-term high selenium makes children’s body length, weight development delay, rough and fragile hair, and even have neurological symptoms and intelligent changes. The main characteristics of chronic selenium poisoning are hair loss and changes in nail shape.
So How Should You Test the Content of Selenium in Water?
The T8000-Se Total Selenium online analyzer produced by Hangzhou Modi-Tech is a fully automatic analyzer controlled by an embedded system, which can be applied to a variety of water quality such as river water, surface water and industrial wastewater. After the sample is filtered, it is pumped into the reactor. First, the masking agent is injected to eliminate the interfering substances, and then the pH value of the solution is adjusted to make the solution have a suitable pH. Then the characteristic color developer is added to react with selenium in water for color development, and the absorbance of the reactants is measured. The concentration of selenium in the sample is calculated by the absorbance value and the correction factor stored in the monitor.
