WAN Chang-yuan^1，2，WANG Ming-yu^2，*，WANG Hui-fang²，CHEN Jian-ping^1，2，ZHANG Min²，CHEN Ya-wei²
（1. Environmetal Science and Engineering College, Liaoning Engineering Technology University, Liaoning, Fuxin123000, China; 2. Water System Safety Research Centre,University of Chinese Academy of Sciences and School of Resource and Environment, Beijing100049, China）

 

Abstract: Temporal and spatial distributions of nitrogen contamination in groundwater of the North China Plain are unclearly known. The nitrogen pollution assessment and analysis of its pollution distribution pattern in this area is needed. According to the hydrogeologic conditions of the North China Plain, we selected two geologic across-sections in this region from the piedmont plain to the central plains to obtain the nitrogen contents in groundwater samples four times, The data of nitrogen contents for four times from 2010 to 2013 in groundwater samples along two geologic across-sections were estimated and the nitrogen pollution status was analyzed systematically. The results showed that along the typical geologic cross-sections of the North China Plain, ammonia exceeded most seriously that in drinking water standard , among ammonia, nitrate, and nitrate in groundwater, the total amount of ammonia, nitrate, and nitrate concentrations increased with time for those 3 years overall. Spatially, the average concentrations of nitrate and ammonia in the piedmont plain were higher than those in the central plains, while the average concentrations of nitrite in the piedmont plain were far lower than those in the central plains. Furthermore, in the vertical direction, the concentrations of ammonia, nitrate, and nitrate in groundwater decreased generally with depth. Finally, total nitrogen concentrations in groundwater in different types of wells varied while they were higher in those irrigation and monitoring wells , and, however, the ammonia contamination in the drinking wells was relatively serious, which would bring about a risk to human health.

Key words: North China Plain; typical cross-section; groundwater; nitrogen contamination; temporal and spatial distribution

EARTH AND ENVIRONMENT Vol. 42, No.4, Tot No.300, 2014, Page 472-479