What is a good water standards? What kind of water can be called quality water? For questions about water, I believe many people will have, here are the relevant industry experts discuss the pros and cons of the quality standards of the water, together with the small series to look at it!
pros and cons of drinking water are clear indicators you do? (Picture from the network)
In Equation "Guidelines for Drinking" index of Nitrate and nitrite nitrogen (Nitrate + Nitrite) is: Nitrate Assay value / standard value + nitrate alkylene measured value / standard value 鈮?
Related expert said water "due to nitrite and nitrate are the letters N, index less than or equal 1. Therefore, we believe N1 may serve as a shorthand of nitrite and nitrate composite index. "
according to the WHO" guidelines for drinking predetermined "drinking water N1 just 1 or less qualified for the safe drinking water, and the failure was greater than 1 drinking water. "1" is safe cut-off value of water and contaminated water. Therefore, based on the above, Beijing Institute of Public Health proposed drinking water "N1" as an index of drinking water. Namely: N1鈮? unqualified water; 0.5鈮?N1 < 1涓哄畨鍏ㄦ按;N1< 0.5涓轰紭姘淬€?/p>
Although the value N1 as an identifier, but various contaminants present in drinking water can be detected hundreds of species, only one indicator is inevitable It will be generalized. After repeated discussions experts, according to Chinas characteristics and the existing level of technology, it made several auxiliary indicator, the TOC, the comprehensive index of taste, the water content of sodium, total dissolved solids.
Experts said that good water standards emphasize comprehensive index, does not emphasize individual indicators, we must first meet the N1 index 鈮?.5 this requirement, and the rest is total organic carbon, a comprehensive index of taste, sodium water content and total dissolved solids.
refers to the total amount of the so-called TOC water solubility and a carbon-containing organic suspension. Many types of organic matter in the water, it can not all be isolated and identified. Often expressed as "TOC". TOC is a composite indicator of the rapid test, which represents the total amount of water containing organic matter of the amount of carbon.
Comprehensive taste index
good water to drink first tasteBetter. Different people feel different texture and taste factors, there are many, after repeated verification and Research Institute of Beijing public health drinking water for many years, decided to continue to use the Japanese professor Hashimoto taste index. Water mouth feel of ionic various proportions of water. Zhao Feihong said, "taste index mainly take into account the ratio between the number of cations and anions. Therefore, we will also be used as an important indicator of good water."
sodium content in the water
2013 WHO released a roadmap to adults and children daily sodium intake, the report pointed out that excessive sodium intake for adults is cardiovascular disease, blood pressure and coronary heart disease have a direct role in childrens high sodium intake membership cause high blood pressure in children. From the daily intake of nutritional point of view, human daily intake of sodium is 200-500mg / day.
people daily diet contain large amounts of sodium sodium, cheese, bread, smoked or cured meats, monosodium glutamate and other spices contain, WHO therefore proposed to control the intake of sodium to relieve high blood pressure, cardiovascular disease, coronary heart disease, stroke and so has a good effect. Thus the sodium content of the water should be controlled. Studies have shown that, when the sodium in water is higher than 60mg / L, and some sensitive people can enjoy the taste out. And for those special populations, such as artificial milk-fed infants, AIDS, immune deficiency, the sodium content of the elderly, the water should not exceed 20mg / L.
Total Dissolved Solids
the so-called total dissolved solids (TDS) represent those which can be dissolved in water, it can be said to be the total amount of mineral dissolved in the water. EU water quality standards in view, total dissolved solids less than 500mg / L when, this water can be used as conventional drinking water, if this indicator is too high, when the drinking should be controlled.
of science in the development of controversy and criticism, this recommendation may have a different voice, a different point of view, this is a normal phenomenon. With the participation of the progress of science and the majority of scientists in the future to further enrich the recommended standard revision.
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