Physico-chemical Assessment of Soil Pollutants, Water Quality Parameters and Industrial Effluent Pollutants (Toxic and Heavy Metals, Trace Elements) by using Atomic Absorption Spectrophotometer (AAS), UV-Visible Spectrophotometer and Inductively Couple Plasma-Optic Emission Spectrophotometer (ICP-OES) and its Impact on the Coastal Zone of Bangladesh.