Abstract
PM10 (particulate matter less than 10 mm in diameter) in the dry season at four sites representing for traffic, commercial, residential and mixed areas in Hanoi was sampled by low-volume samplers. Each sample was collected for a period of a day (24 hours). The concentrations of 8 ions, namely K+, Na+, Ca2+, Mg2+, NH4+, Cl-, NO3-, SO42-, were analyzed by ion chromatography with conductivity detection.
On average PM10 concentrations, the lowest value of 140 mg/Nm3 was at the mixed site and the highest value of 288 mg/Nm3 was at the traffic site. Analytical results showed a domination of NO3- and SO42- in the collected PM10. The dominant concentrations of NO3- and SO42- in the city may result from traffic activities and fuel combustion in industry respectively as reported by another study.
The low variation of PM10 concentrations as well as its ion compositions from site to site was observed supposing a good dispersion and/or a long-range transport of PM10 in the city.
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