[Composition Characteristics and Sources Apportionment of Lanthanoid in PM_2.5 of Quanzhou]

Samples of PM_2.5 were collected from 5 sites in Quanzhou in March, April and July, 2014. The concentrations of lanthanoid and other trace metals in the PM_2.5 were determined by Inductively Coupled Plasma Mass Spectrometry(ICP-MS). The total lanthanoid concentration (ΣLoid), the ratio of light-lanthanoid(L Loid, including, La, Ce, Pr, Nd, Sm and Eu) to heavy-lanthanoid(H Loid, including Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu) in PM_2.5 were 2.490-5.708 ng·m^-3(65.682-126.529 μg·g^-1) and 12.086-14.319, respectively. The distribution pattern of Loid in PM_2.5 was also evaluated in this study. All PM_2.5 samples showed similar distribution pattern with local topsoil. And positive Ce and negative Eu anomalies were observed in PM_2.5. La-Ce-V plots and chemical mass balance(CMB) model were used for source identification and apportionment of PM_2.5in Quanzhou. The CMB model was used to identify four main sources:urban fugitive dust, coal combustion, vehicle exhaust and waste incineration emission which had a contribution of 18.9%, 10.9%, 30.6% and 30.2%, respectively.