If you add the valences of each atom in the molecular formula for arsenious acid, H 3 AsO 3, you can see that the molecule, which is uncharged, has a total valence state of 0 (3x(+1) for the hydrogen atoms; 1x(+3) for the arsenic(III) atom; 3x(-2) for the oxygen atoms = 3+3-6 = 0).
Eighty percent of sewage in India is untreated and flows directly into the nation's rivers, polluting the main sources of drinking water, a study by an environment watchdog showed Tuesday.
Agriculture is one of the main sources of diffuse water pollution. It is only by working with landowners and farmers to ensure management of the land in a way that is sensitive to the ecological health of the water environment that we will reduce this pressure.griculture is one of the main sources of diffuse water pollution. It is only by working with landowners and farmers to ensure management of the land in a way that is sensitive to the ecological health of the water environment that we will reduce this pressure.