辽河支流条子河中多环芳烃和有机氯农药的时空分布及来源解析

Water and surface sediment samples were collected from the Tiaozi River, a branch of Liaohe River, in spring, summer, autumn and winter. 16 primary polycyclic aromatic hydrocarbons (PAHs) and 8 typical organochlorine pesticides in these samples were determined by a GC-MS analyzer. In addition, the distribution and source of the organic pollutants were identified. Results indicated that the total PAHs levels in the water samples were 658.1~3096.6ng/L (arithmetic mean: 1522.1ng/L) and in the sediments were 775.7~2835.4ng/g (1374.0ng/g). α, β and γ-HCH were detected out in all the samples and the total HCHs were 5.36~16.57 ng/L (10.93ng/L) in the water samples and 2.87~5.56ng/g (4.34ng/g) in the sediments. DDTs in all the samples were below the detection limit. Temporospatial distributions of PAHs in the river water and sediments were similar: Both the PAHs levels decrease in the order: summer > spring > autumn > winter and decrease from the upstream to the downstream. In contrast, temporospatial distributions of HCHs in the river water and sediments were opposite: HCHs levels in the water decrease in the order: summer > spring > autumn > winter and reduce from the downstream to the upstream; HCHs levels in the sediments decrease in the order: winter > autumn > spring > summer and decrease from the upstream to the downstream. The source identification of PAHs and HCHs revealed that PAHs in the river were mainly from the coal combustion sources and the transportation sources, and HCHs were from the use of lindane as pesticide in the past.