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首页> 外文期刊>Air quality, atmosphere & health >Carbonaceous species in total suspended particulate matters at different urban and suburban locations in the Greater Dhaka region, Bangladesh
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Carbonaceous species in total suspended particulate matters at different urban and suburban locations in the Greater Dhaka region, Bangladesh

机译：孟加拉国大达卡地区不同城市和郊区的悬浮颗粒物中的含碳物质

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Particulate matters were collected at different urban and suburban locations in greater Dhaka region with a low volume sampler on Quartz filter papers. Total carbon (TC) was determined with combustion method and elemental carbon (EC) with two steps thermal method. Organic carbon (OC) was calculated from the difference between TC and EC. The grand average TC, EC, and OC concentrations in greater Dhaka were 81.2, 25.4, and 55.4 μg m−3, respectively. Average EC concentration was 32.4 ± 17.1 μg m−3 (urban Dhaka) and 18.4 ± 7.9 μg m−3 (suburban Dhaka). Average OC concentration was 76.7 ± 58.0 μg m−3 (urban Dhaka) and 34.1 ± 21.7 μg m−3 (suburban Dhaka). The average TC, OC, and EC concentrations at urban Dhaka were 52.2%, 55.5%, and 43.2% higher than the suburban Dhaka values, respectively. Very high concentrations were observed for carbonaceous species in Dhaka region. These may be due to the increased number of traffic vehicles, traffic jams, and also contributions from industrial growth in Dhaka city. Average EC/TC ratios are 0.34 for urban Dhaka and 0.37 for suburban Dhaka indicating typical fossil fuel is the source of carbonaceous species in greater Dhaka. The OC/EC ratio at urban Dhaka is 2.17, which is an indication of secondary OC formation rather than primary. The suburban Dhaka OC/EC ratio is 1.86 indicating OC is mostly primary origin. OC was the major carbonaceous component representing about 68% of the TC content (65% for suburban Dhaka and 70% urban Dhaka). A high fraction of OC in Dhaka aerosol may have serious implications for human health and climate change.
机译：在大达卡地区的不同城市和郊区，使用石英滤纸上的少量采样器收集了颗粒物。用燃烧法测定总碳（TC），用两步热法测定元素碳（EC）。根据TC和EC之间的差异计算有机碳（OC）。达卡大区的总平均TC，EC和OC浓度分别为81.2、25.4和55.4μgm-3。 EC的平均浓度为32.4±17.1μgm-3（市区达卡）和18.4±7.9μgm-3（市区达卡）。平均OC浓度为76.7±58.0μgm-3（市区达卡）和34.1±21.7μgm-3（市区达卡）。达卡市区的平均TC，OC和EC浓度分别比郊区达卡值高52.2％，55.5％和43.2％。在达卡地区，碳质物质的浓度非常高。这些可能是由于交通车辆的数量增加，交通拥堵以及达卡市工业增长的贡献。达卡市区的平均EC / TC比为0.34，达卡郊区的平均EC / TC比为0.37，表明典型的化石燃料是达卡大区含碳物质的来源。达卡市区的OC / EC比为2.17，这表明形成了次级OC，而不是初级OC。郊区达卡的OC / EC比为1.86，表明OC主要是主要来源。 OC是主要的碳质成分，约占TC含量的68％（达卡郊区为65％，达卡市区为70％）。达卡气雾剂中大量的OC可能对人类健康和气候变化产生严重影响。

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