夏天，车里的瓶装水真的会变成“毒水”？

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                    <p style="line-height: 1.75em;"><span style="font-size: 18px;">   早在几年前，“矿泉水瓶在遇热后会有致癌物释放并溶于水中”的说法就一直存在。那么，车主们随手放在车内的瓶装矿泉水，真的会变成“毒水”吗？</span></p><p style="line-height: 1.75em;"><span style="font-size: 18px;">　　关于“有毒物质”的解释主要有两种：第一种是在高于70℃的环境下，矿泉水瓶发生变形，可能会溶出铅、锑等有毒物质。第二种是高温条件下或反复使用，矿泉水瓶可能会释放出致癌物DEHP增塑剂。</span></p><p style="line-height: 1.75em;"><span style="font-size: 18px;">　  实验证明，将一瓶矿泉水放置在密闭车辆内暴晒7天后，送检水样中未检出邻苯二甲酸酯类物质，可见尽管在温度最高可以达到70℃的车内放置了一周，瓶体也无增塑剂析出。实验还发现，无论是晒前还是晒后，在塑料瓶密封条件下，水中的微生物很难繁殖，瓶装水的菌落总数均在合格范围内。</span></p><p style="line-height: 1.75em;"><span style="font-size: 18px;">　　对此，江南大学蒋平平教授告诉《生命时报》记者，瓶装水的瓶体PET中一般不添加增塑剂这种物质，这是由制作工艺决定的。而PET的稳定性是由材料聚合度所决定的，一般来说，当温度小于120℃时，PET材料是十分安全的。</span></p><p style="text-align: center; line-height: 1.75em;"><img data-s="300,640" data-type="jpeg" src="http://mmbiz.qpic.cn/mmbiz/dx3KibwtDhvchZYqVjrEG6hRyZqWfFbXyfx5D0BO0DFqpZjfwLgm94ZLAptmsqMx18HknokZGOJIs8pjb59VcQw/0?wx_fmt=jpeg" data-ratio="0.67" data-w="300"  /></p><p style="line-height: 1.75em;"><span style="font-size: 18px;">　　浙江大学叶胜荣教授也认为，PET的结构相当稳定，其融化温度超过250℃，要发生化学变化至少要在100℃以上，汽车内显然达不到这样高的温度。</span></p><p style="line-height: 1.75em;"><span style="font-size: 18px;">　　虽然传闻被实验结果否定，但专家表示，保存瓶装水仍应注意瓶身标注的适宜存放温度、保质期和“避免高温和阳光直射”等存放要求。可以在车里放瓶装水，以备不时之需，但应缩短储存时间并经常更换。开启后最好在24小时内饮用。</span></p><p style="line-height: 1.75em;"><span style="font-size: 18px;"><br  /></span></p><p style=""><span style="margin: 0px; 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