A) Different types of impurities are
i) Dissolved impurities:
a) Inorganic salts
i) Cations:Ca+2,Mg+2, Na+,K+,Fe+2, Al+3 traces of
Zn+2 etc
ii) anions: Cl-,SO42-, NO3-,HCO3-&sometimes F-&NO2-
b) Gases: CO2,O2, N2 oxides of N2&sometimes NH3,H2S
c) Organic salts
ii) Suspended impurities
a) Inorganic: Clay and sand
b) Organic: Oil globules, Vegetable and Animal matter
iii) Colloidal impurities: Finely divided Clay & Silica, Products from
organic waste
iv) Bacterial impurities: Bacteria, other microorganisms and other forms of animal &vegetable life
Tags
waterchemistry