T he content of nitrite in vegeta-bles is positively correlated with t he content of nitrite in soil and the l ength of time that picked vegetables are kept.

• 实验结果表明用洗洁精去除亚硝酸盐效果最好,淘米水次之,清水效果甚微,并且样品中亚硝酸盐含量与样品所生长的土壤的亚硝酸盐含量成正比,样品放置天数也与亚硝酸盐含量成正比。