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鑒別無毒與有毒塑料薄膜的三種方法
發布時間: 2014/8/22 17:07:55    瀏覽次數: 0

        怎樣區別無毒與有毒的塑料薄膜呢?最常用的鑒別方法有感觀檢驗和燃燒法及水浸法等。
        感觀檢驗:聚乙烯和聚丙烯比聚氯乙烯薄膜透明度好,表面上有一層蠟質的光澤,手摸則有一種潤滑的感覺,而聚氯乙烯呈乳白色,透明度較差,手感粘膩,色澤發暗,感觀不佳。
燃燒鑒別法:聚乙烯,容易點燃,火焰分兩色,頂部為黃色,底部火焰為藍色,有蠟味,無煙,離開明火能繼續燃燒;聚丙烯與聚乙烯不同者,只是有少量黑煙,有石油味。而有毒的聚氯乙烯難于點燃,火焰也分兩色,上部為黃色,’下部為綠色,火焰呈噴濺狀,冒白煙,有刺鼻的辛辣味,離開明火即滅。由于聚氯乙烯薄膜有毒,也不應在廚房中燒毀,以免造成空氣污染。
        水浸鑒別法:此法既簡單又實用,把塑料袋浸進水里,用手按壓入水中,放手G如沉在水中者,一般都是有毒的,能浮上水面者,一般都是無毒的。
 
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