Nitrate and nitrite change rule has had the obvious change in the vegetables juice.The nitrate content is reduces gradually, but the nitrite content is increases gradually in the storing process.

• 新鲜蔬菜榨汁后，贮存时硝酸盐和亚硝酸盐的含量变化规律发生了明显差异，硝酸盐的含量是逐渐减小，而亚硝酸盐的含量是逐渐增大的，且这种增大的趋势非常大；