Education Program for Field-Oriented Leaders in Environmental Sectors in Asia and Africa (FOLENS), Tokyo University of Agriculture and Technology, Tokyo, Japan,
Environ Monit Assess. 2014 Feb;186(2):845-58. doi: 10.1007/s10661-013-3421-y. Epub 2013 Oct 10.
In this study, we focused on water quality in an urban canal and the Mekong River in the city of Can Tho, a central municipality of the Mekong Delta region, southern Vietnam. Water temperature, pH, electrical conductivity, BOD5, CODCr, Na(+), Cl(-), NH4 (+)-N, SO4 (2-)-S, NO3 (-)-N, and NO2 (-)-N for both canal and river, and tide level of the urban canal, were monitored once per month from May 2010 to April 2012. The urban canal is subject to severe anthropogenic contamination, owing to poor sewage treatment. In general, water quality in the canal exhibited strong tidal variation, poorer at lower tides and better at higher tides. Some anomalies were observed, with degraded water quality under some high-tide conditions. These were associated with flow from the upstream residential area. Therefore, it was concluded that water quality in the urban canal changed with a balance between dilution effects and extent of contaminant supply, both driven by tidal fluctuations in the Mekong River.
在本研究中，我们专注于越南南部湄公河三角洲地区中心直辖市芹苴市的城市运河和湄公河的水质。从 2010 年 5 月到 2012 年 4 月，每月监测一次运河和河流的水温、pH 值、电导率、BOD5、CODCr、Na(+)、Cl(-)、NH4 (+)-N、SO4 (2-)-S、NO3 (-)-N 和 NO2 (-)-N 以及城市运河的潮位。由于污水处理不佳，城市运河受到严重的人为污染。一般来说，运河的水质表现出强烈的潮汐变化，低潮时水质较差，高潮时水质较好。观察到一些异常情况，在一些高潮水条件下水质恶化。这些情况与上游居民区的水流有关。因此，结论是城市运河的水质变化与湄公河潮汐波动引起的稀释效应和污染物供应程度之间的平衡有关。
