[Distribution Characteristics and Source Apportionment of Elements Bonded with PM_2.5 and PM₁₀ in Linyi]

To investigate the pollution characteristics and sources of elements bonded with PM_2.5 and PM₁₀ in Linyi, PM_2.5 and PM₁₀ sample collections were carried out simultaneously in Linyi from December 2016 to October 2017, and 23 elements were determined by inductively coupled plasma mass spectrometry (ICP-MS) and inductively coupled plasma optical emission spectrometry (ICP-OES), with the enrichment factor method and PMF employed to determine the source apportionment. The results indicated that the dominant elements in PM_2.5 and PM₁₀ were recognized as Si, Ca, Al, Fe, K, Na, and Mg, accounting for 92.93% and 94.61% of the total measured elements, respectively. The concentrations of 18 elements (excluding Ti, Ni, Mo, Cd, and Mg) were highest in winter and spring, and lowest in summer and autumn. Si, Al, Ca, K, and Na showed the highest levels in spring, mainly distributed in coarse particles; Cu, Zn, Pb, and Sb showed the highest levels in winter, mainly distributed in fine particles. The enrichment factor results showed that the enrichment of Cd, Sb, and Bi was significant, mainly originated by anthropogenic sources such as coal combustion, industrial production, and waste incineration. Based on the analysis results of PMF, coal, and copper smelting, municipal waste incineration, fugitive dust, vehicle emissions, and industrial sources were the main sources of elements in PM_2.5, accounting for 22.64%, 7.49%, 41.22%, 14.71%, and 13.94%, respectively. For PM₁₀, fugitive dust, coal and copper smelting, vehicle emissions, and industrial sources were the main sources of elements, contributing 55.47%, 19.80%, 7.48%, and 12.83%, respectively. Our results suggested that the main contributors to particulate matter pollution in Linyi during the sampling period were fugitive dust, and coal and copper smelting.