城市工业环境对空气冷凝水化学组分影响

IMPACT OF URBAN INDUSTRIAL ENVIRONMENT ON QUALITY OF COOLED ATMOSPHERIC WATER

采用表面冷凝法收集深圳市6个不同区域的空气冷凝水样品,研究城市中不同功能区对周边环境空气冷凝水化学组分的影响程度,并测量分析在不同时段,由于工业生产等人为活动,空气冷凝水中重金属及离子含量的变化特征。研究结果表明:工业区样品的Cu浓度最高可达261.9μg/L,其Pb浓度为居民区的7倍。工业生产、工程建设等人为活动,能够不同程度地影响冷凝水的化学组分,施工的建筑粉尘导致居民区区域样品中Ca2+浓度(3.49 mg/L)比道路周边(1.98 mg/L)高76.3%。工业环境对空气冷凝水化学组分的影响具有明显的时间变化特征;在交通高峰期17:00—21:00各指标明显上升,非高峰期时段冷凝水中SO2-4、NH+4及NO-3的浓度分别为1.82,3.10,0.73 mg/L,而交通高峰期为3.67,6.12,2.27 mg/L。

Atmospheric water samples were collected by surface cooling methods in 6 different areas in Shenzhen to study the effect of different environment on the quality of collected water. The concentrations of heavy metals and ions in atmospheric water were measured and analyzed. The results showed that the highest concentration of Cu in industrial area was 261. 9 μg /L and Pb was 7 times as high as that in residential area. The chemical compositions of cooled atmospheric water were influenced by human activities,such as industry manufacture,or construction. The concentrations of Ca2 +in residential area( 3. 49 mg /L)were 76. 3% higher than those near road( 1. 98 mg /L) because of dust from construction. The chemical concentrations of samples had obvious temporal variations and showed significantly higher during traffic hours,17: 00- 21: 00. Concentrations of SO2-4,NH+4and NO-3rose from 1. 82,3. 10,0. 73 mg /L to 3. 67,6. 12,2. 27 mg /L respectively during traffic hours.