东营市化工聚集区地下水TOC污染空间分布特性

为掌握东营市化工聚集区地下水受有机污染的总体程度,对该市三县两区96个调查点位的地下水TOC进行了监测。结果表明:化工聚集区地下水TOC质量浓度分布范围为1.5~19.6 mg/L,87.5%的数据集中在2~10 mg/L区段,其中2~4 mg/L的区段数据最密集,数据分布呈对数正态分布。受区域内外部因素共同影响,地下水超标率和异常值比率分别达到62.5%和18.8%,且由南向北呈明显上升趋势;存在浓度均值超标和异常突变数据的化工聚集区数量分别占调查总量的75%和62.5%。地下水TOC受环境地质分布影响显著,黄泛平原区比山前平原区污染范围和程度更高;河口区和广饶井罐区分别是东营市和广饶县地下水污染最严重的地区,广饶县西北部是东营市地下水TOC水质最好的地区。

Study on the Spatial Distribution Characteristics of TOC Pollution for Groundwater in Dongying Chemical Industry Gathering Area

In order to investigate the current situation of organic pollution of groundwater in Dongying chemical industry gathering area, TOC of 96 survey sites were monitored. The results indicated that the distribution of TOC concentrations for groundwater were in the range of 1.5 to 19.6 mg/L, corresponding to 87.5% data from 2 to 10 mg/L, and the data density from 2 to 4 mg/Lwas the highest. The data distribution was approximate lognormal distribution. Due to the mutual influence of internal and external factors, the exceeding rate and the abnormal value ratio were 62.5% and 18.8%, respectively, and showed a rising trend from south to north. The number of chemical industry gathering area with mean values exceeding the standard and abnormal values accounted for 75% and 62.5% of the total samples, respectively. TOC of groundwater was affected by the distribution of geological environment significantly, and the scope and extent of groundwater pollution was higher in the floodplain of Yellow River than in the Piedmont region. Hekou district and the irrigation district of Guangrao were the most polluted area in Dongying and Guangrao, respectively. The northwest of Guangrao was the best area of groundwater quality for TOC in Dongying.