中文摘要：

目的了解高氮施肥区蔬菜硝酸盐及亚硝酸盐污染情况。方法于2011年7—10月选择沙颍河上游地区每月采样,共采集27种、136个蔬菜样品检测硝酸盐、亚硝酸盐含量并进行初步的健康风险评估。结果 8—9月蔬菜硝酸盐含量较高,10月最低;9月蔬菜亚硝酸盐含量最高,7—8月较低,10月最低;7—10月份6类蔬菜亚硝酸盐含量超标（〉4.00mg/kg）率为41.67%,10月均达标。蔬菜硝酸盐健康风险指数除10月外均〉1;亚硝酸盐健康风险指数均〈1。结论该区域蔬菜硝酸盐和亚硝酸盐蓄积水平较高,且硝酸盐存在一定的健康风险。

英文摘要：

Objective To explore the pollution of nitrate and nitrite in vegetables in high-nitrogen fertilization areas. Methods A total of 136 samples of 27 kinds of vegetables, locally grown, were collected monthly from investigated area in upper reaches of Shaying River during July-October 2011.The levels of nitrate and nitrite in samples were determined and health risk assessment was performed also. Results The levels of nitrate in vegetables was higher in August and September,the lowest in October. The levels of nitrite in vegetables was the highest in September, lower in July and August,the lowest in October. The over standard rate of nitrite（〉4.00 mg/kg） in vegetables was 41.67% during July-September,and decreased to 0% in October.Health risk index was 〉1 for nitrate in vegetables except October, and 〈1 for nitrite during July-October. Conclusion Nitrate and nitrite accumulation in vegetables in the investigated high-nitrogen fertilization areas are higher, and nitrate presents a certain health risk.