when cooking in a pot, be sure to use boiled water or filtered water. If you use tap water directly, the tap water has chlorine. After heating, because the pot cover is covered and the chlorine is completely coated on the food, you must steam things with boiled water or filtered water. Because chlorine is carcinogenic. This is really important! Even if it’s just steamed bread, cooking and so on, you should have this common sense!!
1. What are the main methods of disinfection and sterilization of tap water at present?
answer: China’s current tap water purification method: chlorine sterilization; The purification method of tap water in developed countries and regions in the world: ultraviolet and ozone sterilization technology.
2. What is chlorine?
answer: chlorine is yellow green, with strong suffocating odor and toxic gas. It is a strong oxidant. It can form phosgene in contact with carbon dioxide. It can be liquefied into liquid chlorine under high pressure. Its density is 2.48kg/m3, melting point is – 102 ℃, boiling point is – 34.6 ℃. It is white smoke in the air. It is very soluble in water, alcohol and ether. Its aqueous solution is called hydrochloric acid.
3. Why should chlorine be added to tap water?
A: tap water should have been a kind of sanitary and safe drinking water, but due to environmental pollution, a large number of harmful substances such as bacteria in the water breed. In order to inhibit and kill bacteria in the water, chlorine is added in the process of water treatment.
4. What harm does chlorine do to human body?
answer: chlorine is seriously harmful to human body. It can stimulate eyes, nose, throat and upper respiratory tract. Cause acute pulmonary edema and pneumonia. When the concentration is high, it can paralyze the respiratory center and “flash death”. Long term inhalation of low concentration chlorine will cause chronic poisoning, resulting in a large number of free radicals in the body and accelerating the speed of human aging. The main symptoms are rhinitis, chronic bronchitis, emphysema, liver cirrhosis, atherosclerosis and even cancer.
chlorine added to water will make your hair dry, broken and forked. It will also bleach your skin, peel off the skin layer and produce itchy psoriasis allergy. When heated, chlorine and organic humus in water produce carcinogens such as chloroform.
5. What effect does water containing residual chlorine have on cleaning vegetables, fruits and grains?
A: chlorine will destroy the vitamins, minerals and other nutrients in vegetables, fruits and grains, and seriously affect the absorption of nutrients by the human body.
6. How does residual chlorine enter the human body?
A: chlorine used in tap water can be easily and quickly absorbed by any oxide surface with pores, such as skin, nostrils, mouth, lungs, hair, eyes, meat, fruits, vegetables and so on.
why is residual chlorine easily absorbed through human skin?
A: because pores and sweat glands are all over the surface of human skin, residual chlorine can easily enter through these fine pores and be absorbed by human skin at the moment of contact with tap water.
7. What is the harm of bathing with water containing residual chlorine for a long time?
answer: take a bath with tap water containing residual chlorine. 40% of the total chlorine in the bathroom is inhaled through the respiratory tract, and 30% is absorbed by the skin. It is 6 ~ 8 times the chlorine that enters the human body through drinking. People who are light will itch, and the cancer rate will increase by 30% over time to middle age;
what diseases can long-term drinking water containing residual chlorine cause?
answer: heart disease, coronary atherosclerosis, anemia, bladder cancer, liver cancer, rectal cancer, hypertension and allergies.
8. What harm does residual chlorine do to children?
A: when bathing children with tap water, chlorine will make the hair dry, broken and bifurcated, bleach the skin, peel off the skin layer and produce itchy dermatophyte allergy; When chlorine interacts with organic matters, such as sweat, it is easy to form nitrogen trichloride in the surrounding air, which is very easy to damage eyes and throat; When chlorine is inhaled into the lungs through the respiratory tract, it will damage respiratory cells (Clara cells), leading to asthma and emphysema.
9. What harm does residual chlorine do to pregnant women?
A: drinking tap water containing chlorine for a long time by pregnant women will affect the growth of fetal heart and lung, and may lead to neonatal arrhythmia, heart failure and pulmonary dysfunction.
what harm does residual chlorine do to the elderly?
answer: it can lead to atherosclerosis, heart failure, arteriosclerosis, heart disease, bladder cancer, liver cancer, rectal cancer and hypertension.
10. How to remove residual chlorine in tap water?
(to do the following, our tap water is still very safe)
answer: (1) the best and simplest way is to place it for a period of time after receiving the water, especially in the sun, and the residual chlorine will volatilize（ 2) Heat and boil. After the water boils, open the lid and boil for about one minute. The solubility of chlorine in water becomes smaller (the solubility of gas in water decreases with the increase of temperature) and it is easier to escape（ 3) Some commercial drinking water filters also have the effect of removal.