HEAVY METALS IN SUSPENDED SOLIDS IN THE RED RIVER SYSTEM AT CHUONG DUONG BRIDGE (HANOI)

Abstract

The heavy metal content in riverine suspended solids is one of the
environmental pollution variables that pay attentionfoe scientists due to their
impacts on animal life, plants and human health. The paper presents the
monitoring results of heavy metal content in suspended solids in the Red River,
section flowing through Hanoi city in 2019. The results showed the heavy metal
contents of heavy metal as follows: Pb: 34.18 - 66.25ppm; Zn: 65.72 - 89.48ppm;
Cu: 48.08 - 120.80ppm; Cd: 0.16 - 0.39ppm; Fe: 28460.00 - 41881.25ppm; Cr: 28.46
- 35.88ppm; Mn: 516.4 - 685.0ppm; As: 16.84 - 28.22ppm; Hg: 0.13 - 0.22ppm. The
heavy metal concentration is arranged in descending order as follows:
Fe>Mn>Cu>Zn>Pb>Cr>As>Cd>Hg. Within different HM observed, the mean
values of Fe and As contents were 1.9 and 1.4 times respectively higher than the
allowable values of the Vietnam Standards on the HM in riverine sediment QCVN
43: 2017/BTNMT. The results contributed to the database of the Red River sediment
and water quality in order to protect the Red River water environment.