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科學實驗證實捆綁蔬菜甲醛超標10倍

放大字體  縮小字體 發布日期:2016-06-03  來源:農業網  瀏覽次數:854647
內容摘要:   常去超市買菜的馬大嫂會發現,很多生鮮蔬菜被五顏六色的膠帶捆在一起。近日,央視報道稱,這樣包裝的蔬菜甲醛超標10倍?! ?/div>
        常去超市買菜的馬大嫂會發現,很多生鮮蔬菜被五顏六色的膠帶捆在一起。近日,央視報道稱,這樣包裝的蔬菜甲醛超標10倍。

農民信息網 www.6i47.com   化學專業教授表示,目前超市里用于捆綁蔬菜的膠帶,屬于工業級膠帶,主要成分是聚丙烯酸酯。如果市民將粘有膠帶殘留物的蔬菜進行高溫烹飪,或者用一些溶劑清洗,部分化學物質就會分解、溢出,如果長期食用與膠帶直接接觸的蔬菜,會對消化系統和肝腎系統產生毒副作用。

  權威專家指出,市民購買蔬菜時盡量選擇沒有用膠帶捆綁的。如果購買了用膠帶捆綁的,最好盡快將膠帶去掉,容易去皮的蔬菜應將與膠帶接觸的部分進行削皮處理,或直接去掉膠帶接觸的部分。

  杭州市疾控中心理化科最近做了甲醛蔬菜的試驗,結果顯示,含有甲醛的蔬菜無法用洗滌的方式清除甲醛,處理后還是不能食用的。

  試驗選取了娃娃菜、韭菜和藕三種曾被媒體曝光過的蔬菜項。這些都是沒有被甲醛污染的蔬菜,為模擬被甲醛溶液污染的蔬菜,市疾控中心理化科取適量10%甲醛水溶液于燒杯中,沒過蔬菜,10秒后撈出瀝干。稱取瀝干后的蔬菜50g,分別模擬兩種家庭常用洗菜模式:沖洗和浸泡。

  沖洗組蔬菜先分別在流動的自來水中沖洗5分鐘,2升水中浸泡5分鐘,然后再沖洗5分鐘,浸泡5分鐘,取兩次的浸泡液分別測定其甲醛含量。而浸泡組的蔬菜則依次于4杯2L水中浸泡,每杯浸泡5分鐘,取4次的浸泡液測定其甲醛含量。

  試驗結果是:

  沖洗組 浸泡組

  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)

  娃娃菜7.55 4.57 109.27 8.47 4.63 3.85

  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

  疾控中心理化科專家說,雖然用流水沖洗和浸泡兩種方式都能清除一部分甲醛,但其最終浸泡液中甲醛的含量大于本底值,由此可知經過10分鐘流水沖洗和20分鐘浸泡處理后的蔬菜中仍有甲醛殘留。如果市民買到了甲醛蔬菜,建議不要食用。

  大家在買菜時怎樣才能規避甲醛蔬菜呢?市疾控中心建議大家用聞的辦法。用甲醛溶液處理過的蔬菜,湊近聞會有刺鼻感,而且還會辣眼睛。所以大家在挑選購買蔬菜時可以先聞一聞,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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