气溶胶中正构烷烃的碳优先指数研究

本文研究了北京、广州两地不同季节气溶胶颗粒物上正构烷烃的碳优先指数值(CPI)随季节和颗粒物粒径的变化规律。结果表明,北京地区气溶胶中正构烷烃的CPI值:春>夏>秋>冬;广州地区为冬>春>夏,显示了不同的地区特征,而且随着气溶胶颗粒物粒径的减小,正构烷烃的CPI值亦减小。

INVESTIGATION ON CARBON PREFERENCE INDEX(CPI)OF n-ALKANES IN AEROSOL

Airborne particulate matters were collected in Beijing and Guangzhou in different seasons by using Hi-vol cascade impactor. The change of n-alkane CPI(carbon preference index) by the season and particulate size was studied. The seasonal changes of n-alkane CPI are. Spring >Summer >Autumn >Winter in Beijing, Winter >Spring >Summer in Guangzhou, which shows the different area characteristics,The w-alkane CPI decrease with particulate size.This means the smaller the particulate, the larger the contribution of n-alka-nes from "anthropogenic" sources. The n-alkane CPI is useful to identify the sources of n-alkanes in aerosol particulates.