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本帖最后由 bmatt 于 2013-6-3 17:20 编辑
一直以来我都对用塑料容器种植蔬菜很感兴趣，尤其是其对人体是否产生不良影响的方面。最近有看了不少相关的资料，有点感受和大家分享一下。
我首先想到的是不同塑料瓶下面有标号，不同标号代表不同的意义：
一般矿泉水瓶底
"1号"PET：矿泉水瓶、碳酸饮料瓶等[Maybe not good for gardening, I wouldn't use it]
PET or PETE (polyethylene terephthalate)
PET plastic is the most common for single-use bottled beverages, because it is inexpensive, lightweight and easy to recycle. It poses low risk of leaching breakdown products.
耐热至70℃，只适合装暖饮或冻饮，装高温液体、或加热则易变形，有对人体有害的物质融出。并且，科学家发现，1号塑料品用了10个月后，可能释放出致癌物DEHP，对睾丸具有毒性。
PET is considered safe for single use, but less safe as a reusable container because it can be hard to clean. This makes it absorb "flavors and bacteria that you can't get rid of," according to National Geographic. Though you may not want to drink from a used PET container, it's probably safe for gardening.
"2号"HDPE：high density polyethylene. [Good for gardening]
You can identify HDPE by locating a triangle and the number 2 on the bottom of your container. HDPE is used in milk jugs, juice and water containers as well as most five-gallon food buckets. National Geographic's "Green Guide" claims that HDPE transmits no known chemicals into your food. "Urban Organic Gardener" Mike Lieberman grows a full garden in HDPE plastic buckets.
使用：可在小心清洁后重复使用，但这些容器通常不好清洗。
"3号"PVC：目前很少用于食品包装[NOT GOOD]
使用：这种材质高温时容易有有害物质产生，甚至连制造的过程中它都会释放，有毒物随食物进入人体后，可能引起乳癌、新生儿先天缺陷等疾病。目前，这种材料的容器已经比较少用于包装食品。如果在使用，千万不要让它受热。
"4号"LDPE：保鲜膜、塑料膜等[Maybe good for gardening]
low-density polyethylene, is used most in squeeze bottles and garbage bags. You can identify it by finding a triangle and the number 4 on the bottom of your container. National Geographic lists this another "safer" plastic: it transmits no known chemicals into your food. However, because of its natural flexibility, it may degrade more quickly in your garden, leaving bits of plastic behind.
但是耐热性不强，通常，合格的PE保鲜膜在遇温度超过110℃时会出现热熔现象，会留下一些人体无法分解的塑料制剂。并且，用保鲜膜包裹食物加热，食物中的油脂很容易将保鲜膜中的有害物质溶解出来。因此，食物入微波炉，先要取下包裹着的保鲜膜。
"5号"PP：微波炉餐盒[Good for gardening]
PP stands for polypropylene, a strong plastic mostly used in caps and lids. You can identify polypropylene by a triangle and the number 5 on the bottom of your container, although many lids do not include this "resin number". PP has a high melting point and can be "hot-filled" or used with products that need to incubate. It also does not transmit any known chemicals into food. This makes it an ideal material for a garden container, though large PP containers may be hard to find.
"6号"PS：碗装泡面盒、快餐盒[NOT good for gardening]
★别用微波炉煮碗装方便面
使用：又耐热又抗寒，但不能放进微波炉中，以免因温度过高而释出化学物。并且不能用于乘装强酸（如柳橙汁）、强碱性物质，因为会分解出对人体不好的聚苯乙烯，容易致癌。因此，您要尽量避免用快餐盒打包滚烫的食物。
"7号"PC其它类：水壶、水杯、奶瓶[NOT good for gardening]
Read more: http://www.livestrong.com/articl ... food/#ixzz2V8OKKFmL
总结下来，发现最好使用5号，其次使用2号，再次使用4号（4号容易破碎）
但是看完这些以后心里还是有点不踏实，经常听说塑料里面的东西可能被植物吸收什么的，感觉还是不安全，于是我又继续的放狗研究，看到一篇说的比较详细的文章，是一个叫Willem Van Cotthem（Honorary Professor of Botany, University of Ghent (Belgium). Scientific Consultant for Desertification and Sustainable Development. ）的博客，里面详细的介绍了用塑料种植植物是否能对身体产生不良的影响。我总结下来就是：没有可知的影响（MD，看来哪国专家都不靠谱啊，从来不把话说死），塑料中已知的容易leach到土壤中的化学物质可以被土壤中的微生物所分解，并且化学物质的分子个头较大，不太可能被植物的根系的细胞所吸收，所以不会产生不良影响。连接如下
http://desertification.wordpress ... willem-van-cotthem/
最后，我的总结就是。。。估计没什么问题，就算有问题，也是未知的问题。。。so...我尽量选择5号容器来种植食物，PVC什么的坚决不会使用。。
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贤惠的分寸 (2007-12-11) dorin 
秋意堪培拉 (2004-12-13) leeshine 
发表于 2013-6-3 17:20
谢谢奉献。可惜没分了。
