Other phenomena of mineral water

Many consumers report that mineral water has scale and white floating objects after heating. Relevant departments attached great importance to it, launched an investigation, and made a detailed explanation on the relevant issues that should be raised.

It is understood that many mineral water enterprises often encounter complaints about scaling and floating objects after boiling this mineral water, and often receive calls from users to reflect similar situations. In view of this situation, they collected water samples in time for laboratory analysis and consulted relevant experts. This phenomenon reflected by users is precisely the characteristics of mineral water, a high-quality karst water. According to experts, the salinity of mineral water is about 80-450 mg/L, and it contains strontium and metasilicic acid. It is good for human health. The PH value is 6.5-8.0, which is the best value for drinking water promulgated by the state. The content of bicarbonate ion is high, but the content of chloride ion and sulfate ion is very low. It also contains many trace elements beneficial to human health, such as bromine, iodine, zinc and lithium. All indicators have reached the national regulations. Mineral water has the problem of scale. Experts say that water is hard, and the hardness of water is mainly formed by calcium and magnesium ions. According to the composition of soluble salts, it can be divided into temporary hardness and permanent hardness. When water boils, white precipitates out, and calcium and magnesium ions in water sink to the bottom. Carbonate and bicarbonate are decomposed by heat to produce magnesium carbonate and calcium carbonate, which is "scale". From the composition of water, no matter what kind of water is heated, it will produce scale. White floating objects are produced when mineral water is boiled, because mineral water is rich in metasilicic acid. When water boils, magnesium silicate and calcium silicate are formed. These minerals are insoluble in water even after boiling, but become hollow tiny particles floating on the water surface, forming white floating objects on the water surface. This is completely normal, harmless to the human body, and can be used with confidence.

After mineral water is heated or refrigerated, it will produce a white precipitate the size of a needle tip, called calcium carbonate, which is the same thing as the white powder formed by crushing calcium tablets. Calcium is dissolved in mineral water deep in the stratum, and the water temperature is about 19 degrees Celsius. Mineral water is pumped into water treatment equipment by deep well pump in mineral water plant, and then filled and transported. The water temperature changed and calcium began to precipitate. If it is reheated or refrigerated, the precipitation of calcium will increase, which is the white precipitation we see. The national standard GB8537- 1995 "Sensory Requirements" specifically stipulates that a small amount of natural mineral salts are allowed to precipitate in visible objects, which refers to the above phenomenon. Calcium carbonate is one of the important sources of calcium in human body, and its retention rate in human body is 34%, which is higher than other calcium agents. It is a cheap and good calcium supplement product.

When the hardness of raw water is above 100ppm, this phenomenon will appear after the pure water is heated and boiled, and the higher the hardness, the more obvious it will be. In fact, these substances are naturally formed calcium and magnesium concentrated condensate after pure water is heated and boiled, which is harmless or even beneficial to human health and does not need to be deliberately removed. After pure water is heated and boiled, it will drive away the carbon dioxide in the water, but the PH value in the water will increase slightly. At this time, calcium carbonate and magnesium carbonate in water are easier to precipitate, suspend and condense. Many areas abroad have the habit of drinking cold and clean water, so the above situation is relatively rare. However, Chinese people have always had the habit of cooked food, and they often boil water for drinking, so there are relatively many cases of calcium and magnesium condensation. In fact, in addition to cooking needs, raw drinking water can retain more trace elements and oxygen content in the water, which is good for human bones, heart and blood vessels.

Experts suggest that drinking water with hardness of 150-450 mg/L is most beneficial to human health. Mineral water is mineral-rich water, and its hardness and iron solubility are higher than pure water and tap water. Experiments show that mineral water with hardness below 170 mg/L, soluble solids below 300 mg/L and iron below 0.005 mg/L keeps the characteristics of tea, and is the first choice for tea making in teahouses.

If you use mineral water with minerals higher than the above standards to make tea, it will affect the color, aroma and taste of tea, but it will not affect the quality of tea and human health. Because of poor senses, it often causes some people's "disgust" and misunderstanding.

Why does mineral water make tea darker? Because tea contains a certain amount of protein, tannic acid, pectin, tea polyphenols and other components, they are complexed with calcium, magnesium and iron in mineral water to form turbid precipitate, which affects the turbidity of tea. The oxidation of iron ions in water replaces tannic acid and tea polyphenols in tea, turning colorless carboxyl groups into colored carbon groups, thus deepening the chromaticity of tea, which is brown and affects the senses, but it is harmless. For example, people often cut apples with iron knives. After air oxidation, the pulp on the surface of the incision gradually turns brown, and the principle is the same. This is the reason why iron interacts with tannin pectin. The reaction in new tea is obviously normal, but the taste and trace elements remain unchanged. A man in Beijing bought a bucket of mineral water to go home some time ago. But when he was ready to use it two days later, he found green moss growing in the water. Is there a problem with the water quality? When the reporter came to Mr. Man's house, he found that the bottom of the barrel of mineral water in the yard had changed color and the moss was clearly visible. Mr. Man said that it was night when the water was delivered that day, and he didn't pay attention to the water quality, so he put it on the open space in the yard. It took two days to notice that the water was green. The reporter found that the production date on the mineral water bucket is May 13, which should still be within the shelf life. After receiving the complaint, the dealer came to Mr. Man's house and made such a reply. Shop assistant: You, this is the sun, and this is mineral water, which contains minerals. When the sun shines, it will grow green moss, so you can't bask in it.

Mr. Man discovered that the instructions for mineral water did write a reminder that it is forbidden to take pictures. The reporter also dialed the telephone number of Beijing citizens' drinking water consultation hotline. Telephone attendant: Yes, mineral water can't be taken. It contains minerals, so it will be effective. The appearance of green moss is common sense.

The staff also said that mineral water is different from pure water. In addition to being afraid of light, it is best to drink it within 20 days after opening, and the water dispenser should be cleaned frequently to prevent minerals from remaining in the outlet, which will breed bacteria after a long time.

Mineral water editor

Water dispenser is the secondary pollution source of bottled water. If you don't wash the hot and cold water bladder for three months, it will breed bacteria and even red worms. Generally, there are cleaning steps in the instructions of drinking fountains, so everyone should clean them regularly. Nowadays, the material is extremely rich, the pace of life is getting faster and faster, and people even play down the link of drinking water.

Here I briefly give a few daily drinking suggestions:

First of all, drink enough water every day. Adults should drink at least 2000 ml of water every day. It used to be said that for beauty, there should be a standard quantification of eight glasses of water a day. Drinking any beverage can't replace drinking water, only drinking water can replenish water for human body. On the contrary, drinking drinks will dehydrate the human body, because the digestion and absorption of any drink depends on water to balance metabolism.

Secondly, drink water at the right time. For example, we must drink a large glass of water in the morning, but not immediately after meals. We also need to drink a small glass of water half an hour before going to bed to prevent blood from thickening during sleep, which is especially important for the elderly and the three high groups. Many people drink tea immediately after greasy meals, which is also a very bad habit. Drinking a glass of water half an hour before meals is good for health, while drinking tea immediately after meals will affect the health of digestive tract.

In addition, be sure to drink safe water and drink plenty of water. Medicine is inferior to food, and food is inferior to water. Li Shizhen listed water as the first of all ministries in Compendium of Materia Medica, and good water is the king of all medicines!

World Health The World Health Organization (WHO) has put forward six standards for high-quality drinking water based on the analysis of a large number of survey results in the world's longevity areas:

1) does not contain physical, chemical and biological pollution harmful to human health;

2) contains appropriate amount of minerals (potassium, magnesium, calcium, etc. 100 mg/L), which is beneficial to human health and is in ionic state;

3) Small water cluster and strong solubility and permeability;

4) It should be weakly alkaline (pH 8-9);

5) The water contains dissolved oxygen (about 5mg/L) and carbonate ions;

6) It can quickly and effectively remove acidic metabolites and various harmful substances in the body.

At the same time, remind everyone that the drinking fountains at home and in the office should be cleaned regularly, and the tap water must be boiled. Everyone should try not to drink pure water.

The brands recommended by Mingshui are well-known mineral waters that have been verified for decades or even hundreds of years. Each kind of water has its own unique taste and curative effect. Some are internationally recognized "healing mineral water", and some are called "medical mineral water" by the medical community.

Here I want to emphasize the difference between convalescent mineral water and ordinary mineral water: that is, convalescent mineral water has the effect of preventing, relieving or treating diseases, and has passed the official scientific certification.

Drinking mineral water will produce urinary calculi unscientific.

Cao Zhijun, Associate Professor of Clinical Medicine, Capital Medical University.

With China's reform and opening up, the upsurge of developing mineral water has risen rapidly. This is the continuous improvement of people's life and the gradual enrichment of materials in China. This is a good thing that will greatly improve people's health and should be welcomed with open arms. However, some people are skeptical and casually denounce that "drinking mineral water will produce urinary calculi." I think this statement is unscientific and irresponsible. -Medically speaking, the urinary system (including kidney, ureter, bladder and urethra). It produces stones for special reasons. Including environmental factors, high temperature and high humidity areas, people sweat too much, and urine concentration leads to supersaturation of salt that produces stones; Lack of magnesium ion in soil; Individual factors: vitamin A deficiency, lower urinary tract infection, obstruction and foreign body; Metabolic disorders (such as hyperthyroidism and parathyroid carcinoma) lead to hypercalcemia, while gout leads to hyperuricemia and hyperuricemia. There are three main components of stones: calcium oxalate, phosphate and urate, all of which must crystallize in acidic urine. As far as the composition of mineral water is concerned, all the water quality that meets the drinking mineral water standard has been inspected and approved by the state specialized agencies and is safe. Scientifically speaking, drinking mineral water will not induce urinary calculi, but has preventive and therapeutic effects. Based on the following three aspects: 1. Drinking mineral water regularly can wash internal organs, dilute urine, control and prevent urinary system infection; 2. Mineral water alkalizes urine to prevent calcium oxalate, phosphate and urate from crystallizing out; And has the function of dissolving calculus. 3. Contrary to the lack of magnesium ions in soil, magnesium ions in mineral water can promote the dissolution of calcium oxalate in urine, and can also combine with excess calcium ions in water to form compounds that are not absorbed by blood and are discharged from feces. Therefore, it is a myth that drinking mineral water will produce urinary calculi. On the contrary, I suggest that patients with urinary calculi drink more mineral water as a health care measure and preventive means.

Mineral water and urinary calculi

Xu Fang, a researcher at the Institute of Environmental Health Testing, Chinese Academy of Preventive Medicine.

Mineral water is different from ordinary groundwater because it contains a certain amount of minerals, trace elements or free carbon dioxide gas that is beneficial to human health. Because this kind of water is not polluted by outsiders and contains no heat, it is an ideal healthy drink for human beings.

Man needs minerals, but he can't make them himself. They can only maintain their normal physiological functions through drinking water and food. If this acquisition relationship is unbalanced, it will be morbid. Supplementing minerals can restore health. We have conducted animal tumor inhibition experiments on more than a dozen representative mineral waters in China. The results show that these mineral waters have different anti-tumor effects, and some epidemiological survey data also show that mineral waters do have a great role in promoting human health and prolonging life.

Potassium, sodium, calcium and magnesium in mineral water are necessary to maintain normal physiological functions of human body. Bicarbonate can promote the recovery of gastrointestinal diseases. Sulfuric acid monochloride can promote gastrointestinal peristalsis and treat constipation. Metasilicic acid contributes to bone calcification and promotes growth and development. Silicon can also protect the integrity of arterial structure and reduce the incidence of human coronary heart disease. China mineral water contains more metasilicic acid.

-Trace elements participate in the metabolism of enzymes, hormones and nucleic acids in the human body and have great biological functions. For example, enzymes formed by iron, copper, zinc and cobalt and thyroxine formed by iodine can promote growth and development. The trace elements of mineral water in China are strontium, followed by zinc, lithium and selenium.

-Strontium is a normal component of bones and teeth, although it is very small in human body. Mainly concentrated in places where ossification is strong. Some people have summarized the mortality of some types of cardiovascular diseases and found that strontium and other elements can reduce the mortality of these diseases.

Zinc is an important trace element necessary for human body. As early as the end of 1950s, it has been proved that zinc is a necessary cation for testis to maintain normal physiological function. Population survey found that zinc deficiency in men can cause primary and secondary dysplasia, and zinc is more important for infants with vigorous growth and development.

Selenium is also an essential element for human body. The study of selenium shows that selenium can enhance the immune response of body fluids and cells and has anti-cancer effect.

Lithium exists mostly in the form of compounds in nature, but it is not listed as an essential element for human body. Lithium can regulate the activity of central nervous system, calm mood, improve hematopoietic function and improve human immune function.

Drinking natural mineral water can obtain mineral salts and various trace elements necessary for human physiology, which is really a precious gift given by nature.