Chemical speciation of water-soluble ionic components in PM2.5 derived from peatland fires in Sumatra Island
Chemical speciation of water-soluble ionic components in PM2.5 derived from peatland fires in Sumatra Island
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DOI：
10.1016/j.apr.2019.02.009
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发表时间：
2019-07-01
影响因子：
4.5
通讯作者：
Syafrudin
中科院分区：
文献类型：
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作者：
Fujii, Yusuke;Huboyo, Haryono Setiyo;Syafrudin
我们进行了一项实地研究，以表征水溶性离子物种的PM2.5泥炭地火灾使用地面采样在火源和受体网站在廖内省，苏门答腊岛，印度尼西亚。我们测定了PM2.5质量浓度、水溶性离子浓度和一些化学元素浓度。通过PM2.5现场采样在三个泥炭地火源，我们已经表明，典型的泥炭地火水溶性离子成分的质量分数往往不同泥炭地火源。因此，我们的研究结果表明，PM2.5源配置文件的水溶性离子成分泥炭地火灾必须选择非常谨慎，如果适用于受体模型。从每个泥炭地火灾样品的离子组成的角度来看，Cl-和NH 4+分别是所有泥炭地火灾样品的主导阴离子和阳离子，即，NH 4Cl是一个持续的主导成分。通过现场采样的环境PM2.5在北干巴鲁泥炭地火灾引起的雾霾和非雾霾期间，我们发现在PM2.5的质量和总的水溶性离子成分浓度之间的差异，雾霾和非雾霾样品。灰霾期间，C2 O 42-、NO3-、SO 42-和NH 4+四种组分的浓度都有很高的水平。由于这四种离子被认为是主要的二次形成的气溶胶组分，在雾霾期间增加的水溶性离子组分的总浓度可以主要来自于气体到气溶胶的转换过程。受体地灰霾样品的离子组成与泥炭地火源样品的离子组成有明显的差异。特别是，NH 4Cl，这是泥炭地火灾PM2.5来源的特点，是低在网站在雾霾期间。
We conducted a field study to characterize water-soluble ionic species in PM2.5 from peatland fires using ground-based samplings at fire sources and receptor sites in the Riau Province, Sumatra, Indonesia. We determined the concentrations of PM2.5 mass, water-soluble ions, and some chemical elements. Through PM2.5 field samplings at three peatland fire sources, we have shown that the mass fractions of typical peatland fire water-soluble ionic components tend to differ between peatland fire sources. Thus, our results indicate that PM2.5 source profiles of water-soluble ionic components for peatland fire must be selected with extreme caution if applied to a receptor model. From the viewpoint of ionic composition of each peatland fire sample, Cl- and NH4+ were consistently dominant anions and cations, respectively, for all peatland fire samples, i.e., NH4Cl was a consistently dominant component. Through field samplings of the ambient PM2.5 in Pekanbaru during peatland fire-induced haze and non-haze periods, we found differences in PM2.5 mass and total water-soluble ionic component concentrations between haze and non-haze samples. Four components, C2O42-, NO3-, SO42-, and NH4+, showed highly elevated levels during haze periods. Since these four ions are recognized as the major secondarily formed aerosol components, the increased total concentrations of water-soluble ionic components during haze periods can mainly be derived from the gas-to-aerosol conversion process. The ionic compositions of haze samples at receptor sites are obviously different from those at peatland fire source samples. In particular, NH4Cl, which is characteristic of peatland fire PM2.5 sources, is low at sites during haze periods.