有机蔬菜与普通蔬菜VC及亚硝酸盐含量的测定分析

有机蔬菜的营养及其安全性日益受到人们的关注,为探索有机蔬菜和普通蔬菜的营养价值及安全性,以有机蔬菜和同类普通蔬菜为试验材料,分别采用2,6-二氯靛酚钠滴定法和盐酸萘乙二胺法对其VC和亚硝酸盐含量进行测定分析。结果表明:6份有机蔬菜样品中VC含量普遍高于同类普通蔬菜中的含量,亚硝酸盐含量低于同类普通蔬菜中的含量,且有机蔬菜样品中亚硝酸盐含量均低于国家标准,同类普通蔬菜中有1种蔬菜亚硝酸盐含量超标,超标率为16.7%。可见,有机蔬菜的营养价值高于同类普通蔬菜,且具有较高的安全性。

Determination and Analysis of VC and Nitrite Content in Organic Vegetables and Similar Ordinary Vegetables

The nutrition and security of organic vegetables is getting more and more attention, in order to explore the nutrition and security of ordinary vegetables and organic vegetables, taking organic vegetables and similar ordinary vegetables as experiment materials, the content of vitamin C and nitrite were determined by the methods of Cl2 H6O2 NC12 Na and Hydrochloride Naphthodiamide respectively. The results showed that the content of VC in 6 kinds of organic vegetable samples were higher than similar ordinary vegetable samples. On the con- trary,the nitrite content were less than similar ordinary vegetables which were all lower than national stand ard,and the nitrite content of a kind of ordinary vegetables exceeded national standard, s~andard rate was 16.7%. Obviously organic vegetables not only contained more nutrition than similar ordinary vegetables, but al so had better security.