Comparison of PM2.5 carbon measurement methods in Hong Kong, China.
Comparison of PM2.5 carbon measurement methods in Hong Kong, China.
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DOI：
10.1016/j.envpol.2005.01.006
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发表时间：
2005-09
影响因子：
8.9
通讯作者：
J. Chow;J. Watson;P. Louie;L. Chen;D. Sin
中科院分区：
文献类型：
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作者：
J. Chow;J. Watson;P. Louie;L. Chen;D. Sin
来自中国香港的样品，分析了有机碳（OC），元素碳（EC）和总碳（TC）的三个热协议（低温IMPROVE和高温CO2和NIOSH）和两个光学监测方法：反射率和透射率。对于1-55 μg m−3的样品加载量，观察到三种方案之间TC的良好一致性（±10%）。使用反射热解校正的两种方案显示出EC的最佳一致性，对于约80%的样品发现<20%的差异。香港拥有庞大的柴油车队，而部分重载样品的透光率太低，无法进行定量检测，导致基于透光率的OC/EC划分存在很大的不确定性。香港的有机碳水平与美国的相若，但氨基甲酸乙酯的浓度却高得多。两个美国研究中心的OC/EC比率介于2至5之间，三个香港研究中心的OC/EC比率介于0.2至1.2之间。
Samples from Hong Kong, China, were analyzed for organic carbon (OC), elemental carbon (EC), and total carbon (TC) by three thermal protocols (low-temperature IMPROVE and high-temperature STN and NIOSH) and two optical monitoring methods: reflectance and transmittance. Good agreement (±10%) for TC among the three protocols was observed for sample loadings of 1–55 μg m−3. The two protocols using a reflectance pyrolysis correction showed best agreement for EC, with <20% differences found for ∼80% of the samples. Hong Kong has a large diesel fleet, and for some heavily loaded samples the light transmittance was too low for quantitative detection, resulting in large uncertainties in the OC/EC split based on transmittance. Hong Kong experienced OC levels similar to those at US sites, but has much higher EC concentrations. OC/EC ratios range from 2 to 5 at two US sites and from 0.2 to 1.2 at three Hong Kong sites.