The new study found that: Arsenic contamination of drinking
- Author:admin
- Time:14-01-10 10:08
- Hits:185
- Source:未知
Including the United States, many countries in the groundwater contains naturally high levels of arsenic.
A new study found that if the arsenic levels in drinking water reaches an unsafe level, it will harm the lungs, the equivalent of the dangers of smoking for decades.
Arsenic is a known toxin, rocks, water and soil are present. In some areas, increased industrial production will arsenic levels. To study the effect of arsenic on the lungs, the researchers examined the drinking water arsenic levels higher than the EPA permit conditions that occur when the content twice, so the presence of high levels of arsenic in drinking water in Bangladesh.
However, Bangladesh is not the only high levels of arsenic in drinking water in the country. In Argentina, Chile, China, India, Mexico and the United States, natural arsenic content in these countries is also high in some areas.
In 2000, a study found that tens of millions of Americans drink tap water arsenic levels reach safe levels. Since then, the EPA has declared: drinking water for all Americans must meet safety standards. But the survey found that there are still problems in private wells and public wells. Just last year, another famous American media survey found that many American foods, especially in rice products contain high levels of arsenic. Arsenic can be relied on growth and soil water for watering crops into being.
Doctors have learned that if arsenic levels in drinking water reached the level of dangerous people after drinking the risk of systemic disease will be higher, the nervous system, gastrointestinal system, kidneys, liver and immune system damage, increased diabetes and the risk of heart disease. The presence of water and chemical substances have been identified with one of the few cancers, but arsenic is one of them, but may be related with lung cancer.
In the new study, researchers from the United States Public Health and Bangladesh for 20,000 volunteers participated in the study collected samples of drinking water in Bangladesh regional volunteers live wells arsenic levels vary. The researchers also extracted the volunteers 'urine samples to determine the arsenic content in the human body, and tested the volunteers' lung capacity. The researchers found that the higher the arsenic content in the body of volunteers, the smaller their lung capacity. Several researchers at the University of Chicago is a member of the research team, their study showed that volunteers decreased lung capacity levels comparable to long-term decline in lung capacity caused by smoking.
In the 1970s, the first humanitarian organizations in Bangladesh dug deep wells, because there were thousands of children die of cholera in Bangladesh kind of water-borne diseases every year. Aid organizations looking for a more "clean" water, avoiding the relatively close to the surface of the water. In the 1990s, researchers discovered deepwater wells that contain high levels of arsenic, but people are still drinking water therein.
EPA identified several effective methods that can remove arsenic in drinking water, but apparently did not use these methods to Bangladesh wells. In a statement, the World Health Organization, the U.S. • epidemiologist Allen Smith called the situation in Bangladesh, "the history of the largest groups of poisoning."
Recently, the research team has the lung capacity of relevant research results published in the "American Journal of Respiratory and critical care medicine."