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罐头食品具有携带方便、色香味美,即开即食等优点,颇受人们尤其从事地质勘测、远洋航海、登山探险、长途旅游等人员的青睐。 但是,铁制罐头食品不宜长期食用,以免发生铅中毒,使人出现头痛、头晕、腹痛、腹泻、恶心、呕吐等症状;有的甚至出现精神忧郁或烦躁不安、尿中的铅含量明显升高等。罐头食品中的铅从何而来?原来,罐头食品多呈微酸性,为了避免或减少罐头铁皮的腐蚀,一般是在铁皮表面镀上一层化学物质不活泼的锡,接缝用焊锡密封,锡中含有一定量的金属铅,这就是罐头食品中铅的主要来源,铅是一种有毒物质,对人体危
Canned food with easy to carry, color and fragrance of the United States, that is, the advantages of instant food, popular among people particularly engaged in geological exploration, ocean voyage, mountain adventure, long-distance travel and other personnel of all ages. However, iron canned food should not be consumed for a long time to avoid lead poisoning, causing headache, dizziness, abdominal pain, diarrhea, nausea, vomiting and other symptoms; some even mental depression or irritability, significantly increased urinary lead levels . The lead from canned food Originally, mostly canned food slightly acidic, in order to avoid or reduce the corrosion of tin cans, usually coated with a layer of tin in the chemical inert material, the joints sealed with solder, Tin contains a certain amount of metallic lead, which is the main source of lead in canned food, lead is a toxic substance, dangerous to humans