Vol. 3, Issue 3 (2018)
Assessment of water quality index and its seasonal variation in hard rock and soft rock domains along the coastal regions of Tami Nadu and Puducherry, India
Author(s): A Faizal Khan, K. Srinivasamoorthy, R Prakash, F Vinnarasi, C Rabina
Abstract: Water Quality Index and its seasonal variation of samples from hard rock and soft rock domains were calculated along the coastline of Tamil Nadu and Puducherry. Certain parameters like pH, TDS, Ca, Na, K Mg, Cl, NO3, HCO3, SO4, and F were utilized to establish the water quality index. A sum of 38 samples from soft rock domain and 28 samples from hard rock domain were collected during pre and post monsoon seasons. In hard rock domain the water quality index ranges from 29.31 to 164.14 in POM and 55.03 to 519.59 in PRM whereas, in soft rock domain it ranges between 25.61 to 150.49 in POM and 22.08 to 258.49 in PRM. Water Quality Index for hard rock domain is higher than that of soft rock samples. The values varies seasonally, higher values where observed in the PRM. Spatial distribution maps prepared for water quality indicates that hard rock terrain is highly affected than soft rock terrain. The seasonal variation of WQI might be due to the difference in seasonal precipitation, weathering, ion exchange and leaching of minerals.