Recently, a reader asked the editor of drinking water world, saying: "After the mineral water I bought at home is boiled, there is always a thick layer of scale on the kettle. Every time I pour the last cup of water, it is full of slag. It looks uncomfortable whether I drink it or not. This was the case when I used to drink tap water. Later, I drank a brand of pure water for a period of time, but I didn't find this problem. Recently, I changed the mineral water, and these slag appeared again after boiling water. I asked this question Often? "
In fact, the phenomenon mentioned by the reader is that the minerals in the mineral water precipitate after the water is boiled, and the main minerals in the scale are calcium carbonate and magnesium carbonate. It is the same as the scale produced after the tap water is boiled. Whether it is mineral water or boiled tap water, the sediment produced after they are boiled does no harm to the body. Many mineral water enterprises often encounter such complaints about mineral water scaling and floating objects after boiling, and often receive calls from users to reflect similar situations. Every time, the enterprise explains patiently. The official account of WeChat public has been done many times in the world of drinking water.
As we all know, water has hardness. The hardness of water is mainly formed by calcium and magnesium ions, and can be divided into temporary hardness and hardness according to the composition of soluble salts. When water is boiled, there is white precipitation, and the calcium and magnesium ions of water sink at the bottom. Carbonate and bicarbonate are decomposed into magnesium carbonate and calcium carbonate by heating, which is "scale". The main components of scale are calcium and magnesium ions, which are human elements and do not affect health. The "sensory requirements" of gb8537-2018 national standard for drinking natural spring water stipulates that a small amount of natural mineral salt precipitation is allowed for visible objects, which refers to the above phenomenon. Calcium carbonate is one of the important calcium sources of human body. The retention rate in human body is 34%, which is higher than other calcium agents. It is a cheap and good calcium supplement.
In areas with raw water hardness above 150mg / L, this phenomenon will occur after mineral water is heated and boiled, and the higher the hardness is, the more obvious it is. Water quality: drinking water with hardness of 150-450 mg / L is the most conducive to human health.
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