International Journal of Life science and Pharma Reviews (IJLPR)  
International Journal of Life science and Pharma Research (IJLPR)
Life Science
Volume 11 Issue 2, March 2021    Pages:66-73
One-Way ANOVA, Tukey HSD, Scheffe, Bonferroni and Holm Multiple comparison tests for Physico-chemical Parameters in Four Water Bodies of Davangere District, Karnataka    

S. Thirumala and B.R. Kiran
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Surface water  samples  were  collected  for  physico-chemical  analysis during 2016-17 from four water bodies (Hadadi lake, Gonivada lake, Lokikere lake and Shagalealla) of Davanagere district , Karnataka. The main objectives of this study is to analyse various parameters such as  pH, EC, turbidity, total alkalinity, total dissolved solids, chloride,  total hardness, calcium, sodium, sulphate ,nitrogen and potassium. One-way ANOVA, Tukey HSD test with Scheffe, Bonferroni and Holm multiple comparison for the water quality parameters were carried out. pH of all the four water bodies are alkaline in nature with the total hardness included under hard to very hard category. Most of the water quality parameters are highest in Shagalehalla due to the agricultural runoff from the surrounding areas and human anthropogenic activities. One Way ANOVA for physical parameters depicted “F statistic value of 52.1265 with a “P” value of 1.112. Similarly, for chemical parameters “F”value and “P” values are 29.3941 and 5.6732 respectively. The p-value consequent to the F-statistic of one-way ANOVA is lower than 0.05 level and Tukey's HSD test to each of the six pairs of water quality parameters  them exhibits statistically significant difference, We Compared  the  outcome  against  drinking  water quality  standards  as per WHO and BIS, and  it  is  observed  that  water  samples  from  these  water bodies  are potable for human consumption after proper treatment due to moderate levels of pollution as per the physico-chemical data. It is concluded  that  the physico-chemical  characteristics  of  the  water  indicates  that  the water bodies are  moderately eutrophic in nature  and  there is an  urgent need of preventive measures.
Keywords: Water quality, Hadadi lake, Lokikere lake, Gonivada lake, Shagalehalla,One Way-ANOVA,Tukey HSD test.
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