Geochemical analyses of the relationship between surface water and surficial seawater along the coast of Shenzhen

Based on hydrochemical data of 31 surficial seawater samples collected along the coast of Shenzhen,scatter diagrams of major ions(Ca~(2+),Mg~(2+),Na~+,K~+,SO~(2-)_4 and HCO~-_3) vs Cl~-,and Br~-vs Cl~-are analyzed.On the western coast,the Ca~(2+),K~+,SO~(2-)_4 and HCO~-_3 vs Cl~-of surficial seawater deviate from the seawater dilution lines,which are confirmed by the mixture of seawater with river water in different ratios under the influence of the Pearl River.On the eastern coast,the Ca~(2+),K~+ and HCO~-_3 vs Cl~-of surficial seawater fluctuate around the seawater dilution lines,which are resulted from progressively effect by slow flow and evaporation of the surficial seawater and the discharge of local polluted river waters.The compositions of 5 seawater samples on the western coast near the Shenzhen Bay are similar to those of surficial seawater samples on the eastern coast.