The nitrite content of boiled water is higher than that of raw water. And repeated times boiling time is too long or more than 24 hours of boiling water, nitrite content are significantly higher. Boiling water after 24 hours, the nitrite content is just boiled 1.3 times.
Drinking boiled water re-boiling will cause excessive nitrite content in the water, excessive nitrite in the water, exceeding the standard, can be caused by varying degrees of body fatigue, fatigue, lethargy, stupor, bruising, blood pressure drop, abdominal pain, diarrhea, vomiting, and can cause malignant disease in the long term.
The prevention and control of boiled water pollution is very simple: resolutely put an end to the reuse of boiled water, repeated boiling. Five kinds of undrinkable boiled water: (reproduced)
1. On the stove burned overnight or for a long time, drinking is not cold or hot boiled water;
2. Automatic water heaters in the overnight reboiling of boiled water;
3. After many repeated boiling residual boiled water;
4. Sent in the thermos bottle has been non-same day of the water;
5. Steam over leftover boiled water from steaming food such as rice and meat.