摘要
[目的]调查河北省地下水硝酸盐含量变化。[方法]2006～2010年连续5年在河北省11个地区采集2 550个地下水样品,用紫外可见光光度计测定硝态氮含量。[结果]河北省地下水硝态氮含量变幅为0～203.06 mg/L,平均为8.02 mg/L。以不同作物种植类型的地下水硝态氮含量超标率(>10 mg/L)比较,春玉米>菜地>小麦玉米>其他>果树>棉花。地下水硝态氮平均含量以及超标率随着地下水埋深加深而明显降低,埋深大于100 m地下水最好,30～100 m次之,最差的是地下水埋深小于30 m。[结论]按照我国饮用水标准,河北省地下水硝态氮超标率为9.37%,地下水硝态氮含量低于5 mg/L的优良饮用水占总样品的57.69%,基本符合我国饮用水质量标准(Ⅲ类≤20 mg/L)。
[Objective] The research aimed to investigate the change of NO3——N contents in under-ground water of Hebei Province.[Methods] 2 550 groundwater samples were collected in 11 cities of Hebei Province during 2006-2010,and NO3——N contents in under-ground water were analyzed with ultraviolet and visible spectrophotometer.[Result] NO3——N contents in under-ground water of Hebei Province changed from 0 to 203.06 mg/L,averaged 8.02 mg/L.Single maize seeding in spring and vegetable cropping had the severe effects on NO3——N contents in underground water and cotton cropping had the least effect.NO3——N contents in underground water declined with the increasing depth.According to NO3——N contents,the water from buried depth deeper than 100 m had the best quality,and from buried depth less than 30 m had the worst quality.[Conclusion] According to the national drinking water standard,there was 9.37% of samples with NO3——N contents higher than 20 mg/L.NO3——N contents of 57.69% of the samples from Hebei Province was lower or equal to 5 mg/L,which meaned better quality for drinking water.
出处
《安徽农业科学》
CAS
北大核心
2011年第34期21003-21006,共4页
Journal of Anhui Agricultural Sciences
基金
国家科技支撑计划项目(2007BAD87B04)
国家科技支撑计划项目(2006BAD25B06)
农业部科技教育司资助项目(NYB2006-02)
关键词
河北省
硝态氮
含量
影响因素
Hebei Province
NO3-—N
Contents
Influencing factors
