Sr. No. Physicochemical parameters Method/Instrument used WHO Standards (1993) EU Standards (1998) IS: 10500 Desirable limit Permissible limit 1 Temperature Thermometer ___ ___ ___ ___ 2 pH pH paper No guidelines Not mentioned 6.5-8.5 No relaxation 3 Turbidity Turbidimeter No guidelines Not mentioned 5 10 4 Electrical conductance Conductometer 250 250 No guidelines No guidelines 5 Total Hardness Titrimetric No guidelines Not mentioned 300 600 6 Calcium Titrimetric ___ ___ 75 200 7 Magnesium Titrimetric ___ ___ 30 100 8 Sodium Flame Photometer 200 200 ___ ___ 9 Potassium Flame Photometer ___ 10 ___ ___ 10 Chlorides Titrimetric 250 250 250 1000 11 Nitrites Spectrophotometer ___ 0.5 ___ ___ 12 Sulfate Turbidimeter 250 250 200 400 13 Fluorides Spectrophotometer 1.5 1.5 1 1.5 14 E coli Hydrogen Sulfide Production Test Not mentioned 0/ 250 ml ___ ___ 15 Dissolved Oxygen Winkler’s Method No guidelines Not mentioned ___ ___

Table 2: Methods used to determine physicochemical parameters along with WHO, IS and EU standards.