买菜:选少污染看菜色择鲜一买少污染的菜蔬菜儿乎均受农药、粪便、化肥污染。农药污染的轻重取决于菜生虫多少,如白菜类、甘蓝类、芥菜类,尤其是鸡毛菜,最易生虫,生长期需多次喷洒农药,污染特别严重;而胡萝卜、芹菜、香菜、蓬蒿,极少生虫,污染也自然减轻了。粪便污染与蔬菜植株高矮密切相关,塌地生长的荠菜、菠菜、香菜、生菜、鸡毛菜、粪尿直接浇在菜叶上,受粪便污染严重;而蔓生蔬菜以支柱或棚架栽培、如黄瓜、丝瓜、豇豆、番茄远离地而,泼粪不易涉及而污染甚少。化肥含硝酸盐,本身毒性偏低,但进入肠胃形成亚砂胺则成致癌物质。不同蔬菜聚集硝酸盐的程度,差别多达十几倍。据测试内积含量由大到小排列为:根类、薯类、绿叶类、白菜类、葱蒜类、 Grocery shopping: choose less pollution to choose to buy less fresh vegetables to buy less contaminated vegetables are almost pesticides, manure, fertilizer pollution. The severity of pesticide pollution depends on the number of vegetable parasites, such as cabbage, cabbage, mustard, especially chicken feather, the most susceptible to insects, multiple spraying of pesticides during the growing season, the pollution is particularly serious; and carrots, celery, parsley, Basil, with very few worms, naturally lightened the pollution. The faecal contamination is closely related to the height of vegetable plants. The shepherd’s purse, spinach, coriander, lettuce, chicken feather, and urine excreted directly on the leaves of the vegetables are seriously polluted by the excrement. However, the cultivated vegetables are cultivated with pillars or scaffolding such as cucumber , Loofah, cowpea, tomato away from the ground, pouring dung easily involved and little pollution. Nitrate containing chemical fertilizers, their low toxicity, but into the stomach to form sub-amine amine carcinogen. The concentration of different vegetables nitrate, as many as ten times. According to the test, the content of inner product is ranked as follows: root, potato, green leaf, cabbage, onion and garlic,