PRELIMINARY SURVEY OF MANGANESE CONTENT IN DRINKING WATER (TAP WATER AND WELL WATER) IN SEVERAL DISTRICTS OF HANOI CITY

Abstract

Hanoi which is the economic, cultural and political center of Vietnam, has a strong urbanization
development. During urbanization process, imbalances between social-economical development and
environmental quality may occur, including drinking water pollution. Manganese is one of important
variables for assessing drinking water quality and is always treated during the process of drinking
water supply/production. This paper introduced manganese contents in drinking water (tap water
and well water) at some points in different districts in Hanoi. The results showed that the manganese
contents of the tap water samples ranged from 0.002 mg/l to 0.063 mg/l, were within the allowed
limit value of the Vietnamese stardard QCVN 01-2009/BYT for drinking water quality proposed by the
Vietnamese Ministry of Health. The manganese content in well water samples varied in the range
from 0.002 mg/l to 1.103 mg/l, of which the ones of the Nam Tu Liem and Dong Anh districts were
1.27 and 1.04 times higher than the allowed limit value of the QCVN 01-2009/BYT.