新玩家汇娱乐

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科学实验证实捆绑蔬菜甲醛超标10倍

放大字体  缩小字体 发布日期:2016-06-03  来源:农业网  浏览次数:854647
内容摘要:   常去超市买菜的马大嫂会发现,很多生鲜蔬菜被五颜六色的胶带捆在一起。近日,央视报道称,这样包装的蔬菜甲醛超标10倍?! ?/div>
        常去超市买菜的马大嫂会发现,很多生鲜蔬菜被五颜六色的胶带捆在一起。近日,央视报道称,这样包装的蔬菜甲醛超标10倍。

农民信息网 www.fxnonstop.com   化学专业教授表示,目前超市里用于捆绑蔬菜的胶带,属于工业级胶带,主要成分是聚丙烯酸酯。如果市民将粘有胶带残留物的蔬菜进行高温烹饪,或者用一些溶剂清洗,部分化学物质就会分解、溢出,如果长期食用与胶带直接接触的蔬菜,会对消化系统和肝肾系统产生毒副作用。

  权威专家指出,市民购买蔬菜时尽量选择没有用胶带捆绑的。如果购买了用胶带捆绑的,最好尽快将胶带去掉,容易去皮的蔬菜应将与胶带接触的部分进行削皮处理,或直接去掉胶带接触的部分。

新玩家汇娱乐  杭州市疾控中心理化科最近做了甲醛蔬菜的试验,结果显示,含有甲醛的蔬菜无法用洗涤的方式清除甲醛,处理后还是不能食用的。

  试验选取了娃娃菜、韭菜和藕三种曾被媒体曝光过的蔬菜项。这些都是没有被甲醛污染的蔬菜,为模拟被甲醛溶液污染的蔬菜,市疾控中心理化科取适量10%甲醛水溶液于烧杯中,没过蔬菜,10秒后捞出沥干。称取沥干后的蔬菜50g,分别模拟两种家庭常用洗菜模式:冲洗和浸泡。

  冲洗组蔬菜先分别在流动的自来水中冲洗5分钟,2升水中浸泡5分钟,然后再冲洗5分钟,浸泡5分钟,取两次的浸泡液分别测定其甲醛含量。而浸泡组的蔬菜则依次于4杯2L水中浸泡,每杯浸泡5分钟,取4次的浸泡液测定其甲醛含量。

新玩家汇娱乐  试验结果是:

  冲洗组 浸泡组

  蔬菜 第一次(mg/L) 第二次(mg/L)第一次(mg/L) 第二次(mg/L) 第三次(mg/L) 第四次(mg/L)

新玩家汇娱乐  娃娃菜7.55 4.57 109.27 8.47 4.63 3.85

新玩家汇娱乐  韭菜2.28 1.31 48.60 5.61 4.14 3.63

  藕 1.15 0.29 3.49 1.67 0.66 0.31

  疾控中心理化科专家说,虽然用流水冲洗和浸泡两种方式都能清除一部分甲醛,但其最终浸泡液中甲醛的含量大于本底值,由此可知经过10分钟流水冲洗和20分钟浸泡处理后的蔬菜中仍有甲醛残留。如果市民买到了甲醛蔬菜,建议不要食用。

  大家在买菜时怎样才能规避甲醛蔬菜呢?市疾控中心建议大家用闻的办法。用甲醛溶液处理过的蔬菜,凑近闻会有刺鼻感,而且还会辣眼睛。所以大家在挑选购买蔬菜时可以先闻一闻,如果眼睛鼻子有任何刺激感就要警惕是不是“中招”了。

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