Tsinghua University detected carcinogen-disinfection by-product NDMA in tap water in 23 provinces across the country.

On October 17, Chen Chao, an associate researcher at the National Key Laboratory for Environmental Simulation and Pollution Control at Tsinghua University's School of Environment, revealed that the team collected 164 water samples at 155 points (including waterworks, household faucets and water sources) in 44 large, medium and small cities and towns in 23 provinces across the country, from which the carcinogen, the disinfection by-product NDMA (NDMA), was detected.
epidemiological studies have shown that nitrosamines are closely related to digestive tract cancer in some areas.
drinking water nitrosamine detection rate can not be ignored due to carcinogenicity, high detection rate and may be included in the water quality testing standards in China, drinking water nitrosamine disinfection by-products have been unprecedented attention of researchers at home and abroad.
, an associate researcher at the National Key Laboratory for Environmental Simulation and Pollution Control at Tsinghua University's School of Environment, said on October 12th that one of the key research efforts of his team this year was a census of nitrosamine disinfection by-products in the country's drinking water system.
results were published in Water Research, a leading journal in the municipal and environmental fields, "The nitrosamine problem in drinking water is urgent and needs to be studied and engineered as soon as possible!" Chen Chao called.
past three years, Chen Chao and his team have tested nitrosamine disinfection by-products and their presumeds in 44 urban water supply systems.
of all the water samples tested, the average concentrations of NDMA in factory and tap water were 11 ng/L and 13 ng/L, respectively, and the average NDMA generation potential in water source water was 66 ng/L.
said nitrosamine detection rates in China's factory and tap water were 3.6 times higher than in a large-scale census released by the U.S. Environmental Protection Agency in 2012.
drinking water nitrosamine concentrations in Western Europe are lower than in the United States.
Chen Chao said nitrosamines are one of the most health-risky disinfection by-products among the more than 700 disinfection by-products identified, especially NDMA.
is closely related to digestive tract cancer The medical community discovered nitrosamines as a strong carcinogen in the 1950s, when nitrosamines were mainly studied in food, tobacco and industrial pollution.
nitrosamine disinfection by-products in drinking water began at the end of the 20th century.
the early stages of the study showed that nitrosamines were closely related to digestive tract cancers in certain areas of China.
" Chen Chao said, they monitored these areas of tap water from industrial wastewater from serious nitrosamine pollution.
, a team from Nanjing University this year found serious nitrosamine contamination in water sources in several cities in Jiangsu province in eastern China.
" reported that according to toxicology test results, NDMA lifetime drinking one in a million carcinogenic risk concentration is 0.7 ng/L, it is understood that the U.S. Environmental Protection Agency is trying to develop the U.S. nitrosamine concentration standard, the limit may be within one millionth to one millionth of the cancer risk concentration.
"Chen Chao revealed.
Chen Chao said the report showed that NDMA was at higher risk in densely populated and heavily polluted areas.
cities where high concentrations of NDMA have been detected in tap water are likely to be contaminated with NDMA premeducers from industrial and domestic sewage.
experts: water purifiers like chemotherapy unhealthy cooking soup can be used mineral water water pollution incidents and a variety of insiders in recent years, so how to ensure the safety of drinking water for families? In this regard, the author connected to Beijing, consulted the well-known expert on drinking water Professor Li Revival.
: Tap water pollution is a by-product of the development of human industrialization, which is a problem that plagues all countries in the world.
can't be effectively improved in a short period of time.
china, but even the United States, which claims to have the best water conservation, exposed news in 24 major cities in 2008 that tap water contained medicine.
and chemical contamination such as water residues and NDMA (nitrodiamine), there is nothing the average household water purifier can do.
And high-end large-scale water purification equipment is "good or bad to eat", the water harmful and beneficial elements filtered out, just like chemotherapy in general, in killing cancer cells at the same time, the body a large number of good cells also killed.
cause water to become "acid" and "soft", which is also not conducive to health.
Li suggested that to ensure that families drink healthy drinking water, it is best to choose natural bottled mineral water to drink and cook.
because high-quality mineral water generally comes from the rare highland mountains and glacier snow mountains, completely eliminate pollution, health and safety.
, that is, the use of mineral water to cook rice, soup, a day investment is only a few yuan, for the health of a lifetime, is a very cost-effective investment.
there is no problem with using tap water for daily life such as bathing, washing and moping on weekdays.
According to Professor Li Revival: In the environment of serious water pollution, this drinking mineral water, washing tap water scientific classification of water method, is gradually favored by more and more people, become a new healthy lifestyle in urban households.
source: Sichuan Online.