PRELIMINARY OBSERVATION OF DISSOLVED ORGANIC CARBON CONCENTRATIONS IN BAC TU LIEM DISTRICT, HANOI CITY

Abstract

Dissolved organic carbon (DOC) concentrations in rainwater play an important role in the
global carbon cycle, related to climate change. This article presents the preliminary monitoring
results of DOC concentrations in rainwater in different sampling campaigns in both rainy and
dry seasons in the period from May 2023 to January 2024 in Bac Tu Liem district, Hanoi city. The
research results showed that DOC concentrations varied in a wide range, from 0.48 to
10.80mgC.L
-1
, with an average of 3.89mgC.L
-1
, depending on the monitoring times. DOC
increased significantly in the low rainfall density, especially in the dry season, and decreased
considerably in the middle of the rainy season where the high rainfall density was observed.
The DOC concentrations in rainwater in Bac Tu Liem district, Hanoi city, were higher than the
average values in the world and in Asia, probably due to high traffic density and waste burning.
The research results contribute to the database on rainwater quality as well as the scientific
basis for reducing air pollution in Hanoi.