Composition, source, mass closure of PM_(2.5) aerosols for four forests in eastern China

• 作 者: Li Li Wu Wang Jialiang Feng Dongping Zhang Huaijian Li Zeping Gu Bangjin Wang Guoying Sheng Jiamo Fu
• 机 构: Institute of Environmental Pollution and Health,School of Environmental and Chemical Engineering,Sha
• 出 处: 环境科学学报(英文版)
• 发表日期: 2010年3期
• 关键词: PM_(2.5) aerosols forests OC/EC WSOC inorganic ions

PM_(2.5) aerosols were collected in forests along north latitude in boreal-temperate, temperate, subtropical and tropical climatic zones in east China, i.e., Changbai Mountain Nature Reserve (CB), Dongping National Forest Park in Chongming Island (CM), Dinghu Mountain Nature Reserve (DH), Jianfengling Nature Reserve in Hainaa Island (HN). The mass concentrations of PM_(2.5), organic carbon (OC), elemental carbon (EC), water soluble organic carbon (WSOC) as well as concentrations of ten inorganic ions (F~-, Cl~-, NO_3~-,SO_4~(2-), C_2O_4~(2-), NH_4~+, Na~+, K~+, Ca~(2+), Mg~(2+)) were determined. Aerosol chemical mass closures were achieved. The 24-hr average concentrations of PM_(2.5) were 38.8, 89.2, 30.4, 18 μg/m~3 at CB, CM, DH and HN, respectively. Organic matter and EC accounted for 21%-33% and 1.3%-2.3% of PM_(2.5) mass, respectively. The sum of three dominant secondary ions (SO_4~(2-), NO_3~-, NH_4~+) accounted for 44%, 50%, 45% and 16% of local PM_(2.5) mass at CB, CM, DH and HN, respectively. WSOC comprised 35%-65% of OC. The sources of PM_(2.5) include especially important regional anthropogenic pollutions at Chinese forest areas.