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近年来,在城市的郊区巳普遍应用污水灌溉农田,既可供应水及肥料又处理了污水,改善城乡环境卫生。但对食用污水灌溉的蔬菜是否可引致亞硝酸盐中毒,仍有爭論。为了查明污水灌溉是否能引起蔬菜中亞硝酸盐的积聚,我們在紀庄子排水系统的揚楼生产队进行了观察。于蔬菜采样后,立即进行亞硝酸盐测定,即为新鲜蔬菜含量,并用不同方法将蔬菜貯放一定时間后再进行測定,以了解其变化情况。同时,对蔬菜中氨及硝酸盐的含量进行测定以作参考。夏收蔬菜为油菜,生长茁壮,采样后,除立即进行测定外,并用紙裹好,放于室温(30℃)下。次日及第三日,继續测定,共重复三次,其結果如下表:
In recent years, sewage water has been widely used in the suburbs of cities to supply both water and fertilizers, sewage and sanitation in urban and rural areas. However, whether vegetables contaminated with sewage water can cause nitrite poisoning remains controversial. In order to find out if sewage irrigation can cause the accumulation of nitrite in vegetables, we observed the Yang building production team in Ji Zhuangzi drainage system. Immediately after sampling the vegetables, nitrite is measured as the fresh vegetable content, and the vegetables are stored in different ways for a certain period of time before being measured to understand the changes. At the same time, the content of ammonia and nitrate in vegetables was determined for reference. Summer harvest vegetables for rape, robust growth, sampling, in addition to immediate measurement, and wrapped with paper, placed at room temperature (30 ℃). The next day and the third day, continue to measure, repeated a total of three times, the results are as follows: