OXIDATION REDUCTION POTENTIAL (Eh)

The oxidation-reduction potential (Eh) of water can be calculated from the pH, partial pressure of oxygen (PO2) dissolved in water, and the normal oxygen electrode potential E0. It was estimated by a Digital pH Redox Meter- CORNING MODFL- 3, AND HANNA INSTRUEMENT. It was also estimated by following deduction methods (Gautam 1990). The result was expressed in m volt.

 

OXIDATION REDUCTION INDEX (rH2)

Oxidation Reduction Index (rH2) was estimated by deduction of data of Eh by following Gautam (1990).

FREE CARBON DIOXIDE (CO2) IN WATER

Free carbon dioxide (CO2) was determined by titration of water samples with N/44 sodium hydroxide solution (NaOH) using phenolphthalein as an indicator (Welch 1948). The results were expressed in mg. of CO2 per liter (mg/l) of water.

 

BICARBONATE (HCO3) ALKALINITIES OF WATER

Bicarbonate alkalinity or methyl orange alkalinity was determined by titration of 100 ml. of water sample with N/50 sulphuric acid using methyl orange as an indicator (Welch 1948). The result was expressed in mg. of HCO3 per liter (mg/l) of water.

CALCIUM HARDNESS OF WATER

50 ml of sample pretreated with 1 ml. of 8% sodium hydroxide solution was titrated against EDTA solution (0.01M) using Murexide indicator (Mishra et.al.1992). The result was expressed in mg/l.

MAGNESIUM HARDNESS OF WATER

Magnesium hardness was estimated by following Mishra et.al. (1992)method. The resultant data were expressed in mg/l.

NITRATE-NITROGEN IN WATER

Nitrate-Nitrogen (NO3-N) was estimated by following spectrophotometric method as descried by APHA (1989). The result was expressed in mg/l.

PHOSPHATE CONTENT IN WATER

Orthophosphate was estimated by following Ascorbic Acid Method as described by APHA (1989). The resultant data were expressed in mg/l.

POTASSIUM CONTENT IN WATER

Potassium content was estimated by following Flame Photometric Method as described by APHA (1989). The result was expressed in mg/l.

SODIUM CONTENT IN WATER

Sodium content was estimated by following Flame Photometric Method as described by APHA (1989). The resultant data were expressed in mg/l.