Abstract
In order to understand the distribution characteristics of organic carbon (OC) and elemental carbon (EC) in PM2.5 in Changchun; China; PM2.5 samples were collected from April 2017 to December 2017 using the KC-120H particulate matter sampler; and the NIOSH 5040 method was used for determination. The results showed that the average concentration of PM2.5 in Changchun was 45.92 µg/m3 (45.92 ± 50.17), and the annual average concentrations of OC and EC ranged from 15.69 to 24.32 µg/m3 and from 1.38 to 2.33 µg/m3; respectively. The annual OC/EC ratio range was 8.08–15.44; with an average of 11.70. OC and EC concentrations in spring were the lowest; whereas higher levels of both OC and EC were found in winter. Significant correlations between OC and EC were found in the non-heating period; indicating that there was a consistent or similar source; whereas OC was non-significantly correlated with EC in the heating period; suggesting that contributions of OC were from unrelated combustion sources.
Highlights
Carbonaceous material is one important component of atmospheric particulate matter
Organic carbon (OC) and elemental carbon (EC) were found in the non-heating period; indicating that there was a consistent or similar source; whereas OC was non-significantly correlated with EC in the heating period; suggesting that contributions of OC were from unrelated combustion sources
According to the Changchun Statistical Yearbook of 2017 [11], the proportion of coal energy structure consumption in Changchun City is more than 62%, which means that the big OC and EC
Summary
Carbonaceous material is one important component of atmospheric particulate matter. Organic carbon (OC) includes primary organic carbon (POC) and secondary organic carbon (SOC); these are mainly created by the man-made process of fossil fuel combustion, with relatively little contribution from natural sources [1]. Sample collection was conducted from 15 April 2017 to June 2017, June 2017 to 24 August. This aspect of the daily monitoring data was used to analyze the correlations between the OC and EC concentrations in the heating and non-heating periods of the nine sampling sites. Each sampling process lasted for 22 h, and the quartz filter membrane was replaced every 24 h. The filter was folded in half (the sample of the collected particles was on the inside of the fold) and placed in a sealed bag. The quartz filter membrane was accurately weighed before and after sampling by an electronic balance with an accuracy of 0.1 mg (Sartorius, WZA215-LC 210 g/0.01 mg, Gottingen, Germany), data were recorded
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