贵阳市主要蔬菜硝酸盐含量状况与氮磷钾养分的关系

2000年对贵阳市20种主要蔬菜硝酸盐含量和部分样品的氮、磷、钾含量进行测定,结果表明:(1)不同种类蔬菜硝酸盐含量差异很大,其中10种蔬菜可食部分硝酸盐含量超过WHO/FAO(1973)对食品中硝酸盐含量的限量标准;(2)蔬菜中硝酸盐含量与钾含量呈显著负相关;(3)同种蔬菜中硝酸盐含量与氮含量呈显著正相关,与磷含量无显著相关性。

Relationship Between Nitrate Contents in Main Vegetables vs. Their Nitrogen, Phosphorus and Potassium as Nutrients from Guiyang City

Nitrate contents in over 100 samples of 20 vegetables and nitrogen phosphorus and potassium contents in same samples in Guiyang City were evaluated in this survey. The results showed that the contents of nitrate with different varieties of vegetables varied considerably. Amongst these, about 10 fresh vegetables, such as celery, Chinese cabbage and so on, in which the nitrate contents exceeded the standard limit of nitrate in foods stipulated in 1973 by the WHO/FAO. The contents of potassium and of nitrate were significantly negative correlation in the studied vegetables. In contrast, the contents of nitrogen and of nitrate were considerately positive correlation each other while the contents of phosphorus and of nitrate had no significant correlation in the same vegetable.