Assessment of Arsenic Content in Deep Groundwater of Kathmandu Valley, Nepal

Authors

  • Sushila Gwachha 1Environment and Climate Study Laboratory, Faculty of Science, Nepal Academy of Science and Technology, Lalitpur
  • Bishwa Nath Acharya Environment and Climate Study Laboratory, Faculty of Science, Nepal Academy of Science and Technology, Lalitpur
  • Agni Dhakal Environment and Climate Study Laboratory, Faculty of Science, Nepal Academy of Science and Technology, Lalitpur
  • Sujen Man Shrestha Environment and Climate Study Laboratory, Faculty of Science, Nepal Academy of Science and Technology, Lalitpur
  • Tista Prasai Joshi Environment and Climate Study Laboratory, Faculty of Science, Nepal Academy of Science and Technology, Lalitpur

DOI:

https://doi.org/10.3126/njst.v19i1.29785

Keywords:

Arsenic, Deep-groundwater, Guideline, Spatial variation

Abstract

The contamination of groundwater by arsenic is one of the major problems in Nepal. This study was conducted in 20 deep groundwater (>200 m) samples of Kathmandu valley to assess the arsenic content of different groundwater zones and to determine the relationship of arsenic with physico-chemical parameters. Samples were collected in the post-monsoon season of 2016. The random sampling method was applied for the collection of water samples. Standard methods as APHA 2005 was followed for the analysis of the water sample. Arsenic concentration showed spatial variation. The maximum concentration of arsenic was found in Central Groundwater Zone at Patan (27040’07.3” and 85019’14”). Karl Pearson’s correlation coefficient revealed that moderate positive correlation of arsenic concentration with electrical conductivity (μS/cm) (r = 0.58 and p =0.01) and turbidity (NTU) (r = 0.67 and p = 0.01). Groundwater consumers of the central zone of the valley are at risk of arsenic-based health issues.

Downloads

Download data is not yet available.
Abstract
289
pdf
298

Author Biography

Sushila Gwachha, 1Environment and Climate Study Laboratory, Faculty of Science, Nepal Academy of Science and Technology, Lalitpur

Department of Environmental Science, Khwopa College, Bhaktapur

Downloads

Published

2020-07-01

How to Cite

Gwachha, S., Acharya, B. N., Dhakal, A., Shrestha, S. M., & Joshi, T. P. (2020). Assessment of Arsenic Content in Deep Groundwater of Kathmandu Valley, Nepal. Nepal Journal of Science and Technology, 19(1), 69–77. https://doi.org/10.3126/njst.v19i1.29785

Issue

Section

Articles