延边蔬菜种植区地下水中硝酸盐污染分析

Analysis of the nitrate pollution of groundwater in vegetable planting area of Yanbian

用离子色谱法测得42处延边集中蔬菜种植区地下水中硝酸盐平均含量为14.40 mg/L,已经超过MAC,最高值为87.08 mg/L,远超过我国Ⅴ类水质量标准.超过国家饮用水标准(20mg/L)的样点有8个,超标率为19.05%;超过MAC(10 mg/L)的样点有18个,超标率为42.68%,超过国家Ⅴ类水标准的有5个,占总采样点的11.90%.

Through the chromatographic method detected the content of nitrate in 42 vegetable planting areas of Yanbian. The average content of nitrate was 14.40 mg/L , overpassed the MAC,the highest tration was 87.08 mg/L, overpassed the fifth standards of water quality of China. There were 8 samples more than 20 mg/L, overpassed the national standards of drinking water and the excess rate was 19.05 % ;18 samples overpassed the MAC（10 mg/L） ,which excess rate was 42.68 %, 5 samples overpassed the fifth standards of water quality of China, which rate was 11.90 %.