Water is only the source of life, but I don't know when water has become a "source of rumors". Rumor has it that:
Mineral water is more nutritious and can replenish the minerals needed by the human body;
Drinking mineral water and pure water is healthier than drinking boiled water;
Some people say that do not drink thousands of boiling water, overnight water, otherwise it will cause cancer;
Some people say that the water purifier is useless, that is, the marketing scam of the merchant?
......
Are these rumors about "water" true? Don't worry, today Xiaobian will reveal these unknown water "insiders" for everyone, tell everyone which water is better to drink, how to drink water, so that everyone can drink water with confidence.
One
What is the difference between mineral water, pure water and tap water?
Why do people sweat?
Concerns about the quality of tap water are increasingly being drunk only from bottled water or bottled water.
The "2019 China Bottled Drinking Water Industry Consumption Health Trend Report" pointed out that the sales of bottled water in China exceeded 200 billion yuan, and the bottled water sold in a year can circle the earth more than 220 times.
1
Mineral water, mineral water, silly can't tell the difference?
Usually, everyone is accustomed to referring to bottled water as "mineral water", but this mineral water is not "mineral water".
China's definition of natural mineral water is: water that naturally gushes out from the depths of the ground or is collected by drilling, contains a certain amount of minerals, trace elements or other components, is not polluted in a certain area and takes precautions to avoid pollution.
That is to say, a bottle of mineral water in the true sense must meet 2 requirements: one is unpolluted water on the surface or underground, and the other is water that naturally contains minerals and other components.
Many merchants like to hang sheep's heads to sell dog meat and play edge balls, which also has "natural water, spring water, mineral water" and so on.
Natural water, spring water and other water is taken from the surface or underground, but does not necessarily contain minerals; mineral water contains minerals, but its minerals are artificially added, so it can not be called mineral water.
2
Is bottled water more hygienic than tap water?
More than 90% of the bottled water we buy in supermarkets is not mineral water, but pure water, such as a treasure or a field of water.
Pure water refers to the water that can be directly drunk by filtering water such as tap water that meets drinking water sanitation standards.
Many people think that drinking bottled water is drinking health.
The special processing of drinking water dooms them to be "empty and unworthy of their name". For example, pure water uses reverse osmosis technology to kill the beneficial and harmful components in the water, which is equivalent to "no water".
The boiled tap water can kill most of the bacteria and viruses in the water, but still retain the beneficial ingredients. Therefore, drinking pure water is really not necessarily healthier than drinking tap water.
In addition, the international non-profit organization Ora Media tested 11 best-selling bottled waters around the world and found that almost all bottled water was contaminated with microplastics. Microplastics are plastics that can be absorbed by the human body, and the safety is unknown.
Two
What water to drink under what circumstances?
Comparison of common drinking water
In order not to let everyone be wronged for money, we have compiled a comparison chart of common drinking water:
Many merchants claim that their water is safer, more hygienic and more nutritious. The more nutritious mentioned in it mainly refers to the inclusion of minerals, trace elements and other components.
First, we need to know that pure water is based on tap water, the cost is low, and it does not contain minerals, trace elements and other components other than water molecules, so there is no such thing as "supplementing nutrition".
Second, natural water, mountain spring water can contain or do not contain minerals, trace elements, at present, China does not have mandatory national health standards, so it is not necessarily safer and more nutritious. Mineral water is based on pure water, and artificial mineral extract is added, but artificial minerals are not easily absorbed by the human body.
In these four kinds of water, mineral water contains natural minerals, but there is no clear provision on the mineral content in China, that is, water containing only 0.0000000001mg of minerals is also considered mineral water. This mineral, which is so low that it is basically negligible, where can we talk about "supplementing nutrition"?
Of course, if you have requirements for taste, you can choose to buy pure water, natural water, mineral water, etc. If there are no other special requirements, boiled water after boiling is a more economical choice.
In the following cases, it is recommended not to drink tap water
In addition to the following cases, normal people do not need to deliberately buy pure water, mineral water to drink, drink boiled tap water.
Water supply pipelines burst and damage: The water supply equipment in old residential areas has fallen into disrepair, and water pipes are prone to bursting and damage. If the water transmission and distribution or water storage pipeline is broken, the domestic sewage may enter the pipeline and pollute the water quality;
Drinking water sources are polluted by industrial wastewater, domestic wastewater, etc.: if you live in a place where you live, there are illegal enterprises that secretly discharge untreated industrial wastewater or domestic wastewater into drinking water sources, please do not drink;
Tap water residual chlorine content exceeds the standard: chlorine can effectively kill pathogenic microorganisms in the water, China requires that the factory water residual chlorine should be kept between 0.3 ~ 4mg / L, if you feel that the chlorine in tap water is too heavy, it is not recommended to drink.
3
"Unclean" tap water, can the water purifier purify?
Because of the concern that the tap water is not clean, many families have started a household water purifier, but the water purifier can really filter the water clean? Which other water purifier is better?
To know whether the purifier is useful, you must first know its filtration principle. Most household water purifiers are generally composed of three parts: prefiltration, adsorption, and fine filtration (microfiltration, ultrafiltration, nanofiltration, and reverse osmosis).
The main difference between expensive and cheap water purifiers is in the fine filtration part, that is, the membrane separation material used.
If the membrane separation material is compared to a sieve, the filtration capacity of microfiltration, ultrafiltration, nanofiltration and reverse osmosis increases. The advantages of microfiltration and ultrafiltration are that they are cheap, not easy to clog, long service life of the filter element, high water recovery rate, and the disadvantage is that the filtration is not clean enough.
On the contrary, the advantage of nanofiltration and reverse osmosis is that it is filtered clean, especially reverse osmosis can intercept all the components except water such as bacteria, viruses, and heavy metals that cannot be seen by the naked eye, but the disadvantage is expensive, the wastewater rate is high, it is easy to block, and the filter element needs to be replaced frequently.
Friends with high water quality requirements and hope to get direct drinking water can choose reverse osmosis type forehead water purifier; friends who want to be cost-effective and change the filter element less can choose the ultrafiltration type of water purifier; if there is a friend who has the habit of drinking water after boiling, choose which one can be.
Three
Choose the right water, but have you drunk the right water?
Choosing the right water is important, drinking the right water is more important, don't be fooled by these rumors.
Will boiling water and overnight water cause cancer?
People who spread this narrative
It is estimated that I have not drunk the old fire soup in Guangdong
The so-called "thousand boiling water" refers to water that has been repeatedly heated or boiled for a long time, and it and overnight water have been labeled as "excessive nitrite and carcinogenic".
However, to talk about toxicity aside is to play hooliganism.
Nitrite is a highly toxic substance, adults ingesting 0.2 to 0.5 grams will lead to poisoning, accidental ingestion of more than 3 grams can cause death. China's 2012 "Sanitary Standards for Drinking Water" stipulates that the limit value of nitrite in drinking water is 1mg/L.
Shanghai disease control research found that after repeated heating of bottled water 10 times and 52 times, the content of nitrite in the water was 1.8 μg/L and 2.3 μg/L, respectively, which was far lower than the limit value of nitrite in drinking water in China. Similarly, experiments have proved that after a cup of boiled tap water is placed at room temperature for 24 hours, the nitrite content in the water is only 2.37 μg/L.
In other words, if you want to drink water until you are poisoned by nitrite, you have to drink at least 80,000 liters of water. Therefore, everyone can drink "thousand boiling water and overnight water" with confidence.
2 Yin and yang water, water after exposure to the sun can not drink?
Punctured the rumor that "a thousand boiling water, overnight water causes cancer", the family backhand sent the message of "yin and yang water, exposure water can not be drunk" in the family of love?
Generally speaking, yin and yang water refers to water mixed with cold and hot water. Mixing hot water and tap water may indeed "get sick from the mouth" because there may be bacteria, viruses, etc. in the tap water.
However, if the bottled water that meets the sanitary standards is mixed with cold and hot water treated by the reverse osmosis water purifier, it can be safely drunk. These waters are up to the standard of safe drinking, but at different temperatures.
As for the bottled water after exposure, it cannot be drunk, mainly due to the influence of the bottled water material. Most of the bottled water in China uses polyethylene terephthalate (PET) material, its melting point is as high as 250 ° C, and chemical reactions may occur above 100 ° C.
PET bottled water is exposed to high temperatures for a long time, and it is indeed possible to produce unknown substances. However, if it is drinking water in glass bottles or thermos bottles, it may be safe to drink.
Rumor-mongering continues, and rumor-busting continues. If you have any other doubts about water, and are not sure whether these "water things" are rumors or truths, please chat and interact in the comments section below.
Why do people drink water
The more you drink, the more thirsty you get?
As long as there is water in the heart,
You won't be thirsty!