Search results
Results from the WOW.Com Content Network
Arsenic contamination of groundwater is a problem that affects millions of people across the world. ... arsenic are found in nature, although rarely.
A 2007 study found that over 137 million people in more than 70 countries are probably affected by arsenic poisoning of drinking water. The problem became a serious health concern after mass poisoning of water in Bangladesh. [1] Arsenic contamination of ground water is found in many countries throughout the world, including the US. [2]
Elements often discussed as toxic include cadmium, mercury and lead, [6] all of which appear in the World Health Organization's list of 10 chemicals of major public concern. [7] Other examples include chromium and nickel, [8] thallium, bismuth, arsenic, antimony and tin. [4] These toxic elements are found naturally in the earth.
A new study finds that honeybees forging across the U.S. ingest local pollutants, including arsenic and lead, which are detected in their honey. More than 260 samples were taken between 2020 and ...
It may also be found in the soil and air. [5] Recommended levels in water are less than 10–50 μg/L (10–50 parts per billion). [1] Other routes of exposure include toxic waste sites and pseudo-medicine. [1] [3] Most cases of poisoning are accidental. [1] Arsenic acts by changing the functioning of around 200 enzymes. [1]
The metals of antiquity are the seven metals which humans had identified and found use for in prehistoric times in Africa, Europe and throughout Asia: [1] gold, silver, copper, tin, lead, iron, and mercury. Zinc, arsenic, and antimony were also known during antiquity, but they were not recognised as distinct metals until later.
Arsenical bronze objects appear first in the Middle East where arsenic is commonly found in association with copper ore, but the health risks were quickly realized and the quest for sources of the much less hazardous tin ores began early in the Bronze Age. [7]
In addition, he discovered a process similar to pasteurization, [20] along with a means of mass-producing phosphorus (1769), leading Sweden to become one of the world's leading producers of matches. Chlorine gas. Scheele made one other very important scientific discovery in 1774, arguably more revolutionary than his isolation of oxygen.