Calcium In Seawater

Nutrients and minerals are considered as one of the most important parameters in the coastal environment influencing growth, reproduction and metabolic activities of living beings and essential to coastal waters (Bricker and Stevenson, 1996). Its distribution is based on the seasons, tidal conditions and freshwater flow from land source (Kamalkanth et al., 2012). Calcium occurs in water naturally in sea water and seawater contains approximately 400 ppm calcium. One of the main reasons for the abundance of calcium in water is due to natural occurrence in the earth’s crust. Rivers generally contain 1-2 ppm calcium, but in lime areas, rivers may contain calcium concentration as high as 100 ppm, but calcium level of pulicat lagoon influenced by

Similar trend array were studied by Poonam Bhadja and Ashokkumar Vaghela, (2013) from reservoir water in Gujarat. Calcium concentration is highest in estuaries due to the influx of riverine sources. Similar results were reported by Vijaya kumara and Vijaya Kumar (2011). pH of water appears to be dependent upon the relative quantities of calcium carbonates and bicarbonates being alkaline when the quantities of carbonates are high. Magnesium was also positively correlated with calcium and spatial distribution revealed high during monsoon made magnesium to be leached out from sediment. Calcium concentration was also noticed to be high in monsoon and low during summer in the

The soil layer composed of silt and silty loam were dominant among the sediment texture. More sandy and fine sand of sediments texture were found to be very shallow in southern part of the lake. Sandy clay were less near center of the lake and near islands might be due to clay flocculation in calcareous materials where the region with high deposition of molluscan dead shells. Silty sediment had affinity with concentration of phosphate and also silt soil had acidic pH which suggested that the decaying seagrass and seaweed materials in the silt soil could produce H2S gas contributed lower pH (acidic condition) with the humic substance (Thangaradjou and Kannan 2005). Silt concentration in the sediments were observed more during monsoon due to riverine input and heavy rainfall (Padma and Periakali, 1999) from previous season made top course soil to erode and settlement of fine silt and clayey loam texture. Silty loam and loamy texture in Northern part is due to the trapped seagrass and seaweeds. The deposition of clay sediments are predominantly by flocculated as a consequence of a saline and fresh water interface (Cavallotto, 1995), under the low energy and shallow water conditions. The clays are brown to black in color. Therefore, the lower reach (source point, Northern lake) of river with more of clay and silt whereas upper reaches (draining point, Southern lake) noticed to be sand however during monsoon,