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[方法] 用大容量的大气采样器在东京市中心(高1.5 m;流量1.5 m~8/分;用玻璃纤维滤膜)采集飘尘16小时后,将滤膜称重、剪碎、在40～50℃下用甲醇浸提2小时、过滤、40℃下减压浓缩。浓缩残渣用50 ml甲醇-水(4∶1)溶解,把上述甲醇-水液每次加30 ml环己烷萃取5分钟,重复三次。再把合并的
[Method] After collecting the fly ash for 16 hours in the center of Tokyo (height 1.5 m; flow rate 1.5 m ~ 8 / min; using glass fiber membrane) with large capacity atmospheric sampler, the filter was weighed, Leaching with methanol at 50 ° C for 2 hours, filtering, and concentrating at 40 ° C under reduced pressure. The concentrated residue was dissolved in 50 ml of methanol-water (4: 1), and the methanol-water solution was extracted with 30 ml of cyclohexane for 5 minutes each time and repeated three times. Then merged