Spectrophotometric Determination of Manganese in Ground Water in Shillong City Using Bismuthate Oxidation Method

D.G. Marbaniang
Spectrophotometric determination of Mn in ground water samples was performed employing the Bismuthate oxidation method and using the Systronic Model 166 and Visible Spectrophotometer. Thirty-six ground water samples were collected from different parts of the city of Shillong, Meghalaya, India and the depth of the sample sources ranges from 10 feet to 350 feet. The bismuthate oxidation method was first validated to check its efficiency and reproducibility. The minimum detection limit for Mn using this method was observed to be 0.1mg/L. The λmax was also determined and it was found out to be 510nm. The efficiency of the method was about 98-99%. The interference due to the presence of iron was also monitored and it was observed that iron concentration up to 5mg Fe /L did not interfere with the estimation. In this study, the concentration of Mn in the ground water sample was found to be ranged between Below Detection Limit (BDL) to 0.65mg/L. Detectable Mn concentration was observed in all the sampling sites except one location.
Bismuthate; Estimation; Ground; Manganese; Oxidation; Water
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