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Vol. 30 No. 7 (2018): Vol 30 Issue 7

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Evaluation of Corrosivity of Soil Collected from Central Part of Kathmandu Metropolis (Nepal) to Water Supply Metallic Pipes

https://doi.org/10.14233/ajchem.2018.21211
Kumar Prasad Dahal
Central Department of Chemistry, Tribhuvan University, G.P.O. Box 2040, Kathmandu, Nepal
Raj Kumar Karki
Department of Chemistry, Tri-Chandra Multiple Campus, Kathmandu, Nepal
Jagadeesh Bhattarai
Central Department of Chemistry, Tribhuvan University, G.P.O. Box 2040, Kathmandu, Nepal

Corresponding Author(s) : Kumar Prasad Dahal

dahalkumar24@yahoo.com

Asian Journal of Chemistry, Vol. 30 No. 7 (2018): Vol 30 Issue 7

Abstract

Corrosive nature of 56 soil samples collected from central parts of Kathmandu metropolis were analyzed using ASTM standards to evaluate their corrosivity towards the water supply underground galvanized-steel and cast iron pipes. Moisture content of 9.7-58.0 %, 3.0-8.2 pH, 1150-27780 Ohm.cm resistivity, 158-537 mV (saturated hydrogen electrode) oxidation-reduction potential, 13-199 ppm chloride and 30-476 ppm sulfate contents in the collected samples were reported in this study. Results indicated that most of the collected soil samples used in this study is found to be in the range of mildly corrosive to less corrosive nature to the underground galvanized-steel and cast iron pipes. The use of low-cost and easily available materials like gravel and sand around such underground pipes, before burying them in the areas seems to be effective and sufficient to control corrosion of the pipes and to increase their life time in soil of urban areas of Kathmandu metropolis of Nepal.

Keywords

Soil corrosion Metallic-pipe Resistivity Chloride Sulfate
Dahal, K. P., Karki, R. K., & Bhattarai, J. (2018). Evaluation of Corrosivity of Soil Collected from Central Part of Kathmandu Metropolis (Nepal) to Water Supply Metallic Pipes. Asian Journal of Chemistry, 30(7), 1525–1530. https://doi.org/10.14233/ajchem.2018.21211
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