塑料水管中挥发性有机物的迁移研究

Study on Volatile Organic Components Migrating from Plastics Pipes into Drinking Water

介绍了高密度聚乙烯管(PE-HD)、交联聚乙烯管(PE-X)和硬质聚氯乙烯管(PVC-U)中的挥发性有机成分向水中的迁移测定研究。PE-HD 中主要的迁移成分是2,4-二-间-丁基-苯酚(2,4-DTBP),是酚类抗氧化剂的降解产物,除此之外降解产物还有酯、乙醛、酮、芳香烃和萜类化合物。根据塑料管接触水的极限臭味值(TON)估测,在测试的7种 PE-HD 管材中有5种 PE-HD 管的 TON≥4;2种≤4。PE-HD 管释放到水中挥发性有机物(VOC)的总量基本恒定;PEX 管迁移实验显示大量的 VOC 迁移到水中(TON≥5),其中一些迁移的 VOC 成分不确定;HPVC 管向水中迁移的挥发性物质很少。

Water pipes of high-density polyethylene （PE-HD）, crosslinked polyethylene pipes （PE-X）, and rigid poly（vinyl chloride） （PVC-U） were tested with respect to migration of volatile organic compo- nents （VOC） into water. The odour of water in contact with plastic pipes was assessed according to the quantitative threshold odour number （TON）. The major migrating component from PE-HD pipe was 2, 4-di-tert-butyl-phenol （2,4-DTBP） which is a degradation product from phenol antioxidants. In addition, esters, aldehydes, ketones, aromatic hydrocarbons, and terpenoids were identified as migration products from PE-HD pipe. Water in contact with 5/7 PE-HD pipe was assessed as TON≥4. A significant amount of VOC migrated from PE-X pipe into water with TON≥5, some of the migrated VOC were not identified. In contrast, PVC-U pipes released few volatile migrants into water, from which no obvious odour detected.