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Bottled water may not be safer, or healthier, than tap water. The present studies have proved that styrene and some other aromatic compounds leach continuously from polystyrene (PS) bottles used locally for packaging. Water sapmles in contact with PS were extracted by a preconcentration technique called as "purge and trap" and analysed by gas chromatograph-mass spectrometer (GC/MS). Eleven aromatic compounds were identified in these studies. Maximum concentration of styrene in PS bottles was 29.5 μg/L. Apart from styrene, ethyl benzene, toluene and benzene were also quantified but their concentrations were much less than WHO guide line values. All other compounds were in traces. Quality of plastic and storage time were the major factor in leaching of styrene. Concentration of styrene was increased to 69.53 μg/L after one-year storage. In Styrofoam and PS cups studies, hot water was found to be contaminated with styrene and other aromatic compounds. It was observed that temperature played a major role in the leaching of styrene monomer from Styrofoam cups. Paper cups were found to be safe for hot drinks. 相似文献
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【案情】
2012年1月底,广西龙江河发生镉污染超标事件。专家估算,这次事件中镉泄露量约20吨,泄漏量之大国内罕见,龙江下游300公里河段受到波及。在下游柳州地区,市民们纷纷到超市抢购瓶装水。2月初,江苏省镇江市部分居民发现自来水中有异味,随后纷纷抢购瓶装水、桶装水。经专家组全面调查认定,这起自来水异味事件污染源由运输苯酚的韩籍船舶操作不当泄漏导致。 相似文献
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曹丽敏 《辽宁城乡环境科技》2009,(3):41-41
对瓶装水的首次综合能量分析证实了许多环境保护主义者的矛头指向。从开始生产到消费者饮用,瓶装水消耗的能量是自来水(经过净化可以饮用的水)的1100~2000倍。 相似文献
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2000年,农夫山泉炮轰纯净水,指出常饮纯净水对健康无益。一时间几大纯净水品牌大受影响,而消费者特别是纯净水的粉丝们,面对这一言论不知如“喝”是好。不止如此,2008年,康师傅被曝光所谓的优质水源不过是自来水,2009年,又有媒体披露农夫山泉的水源地水质不达标……每一次的报道都在行业内部引发一次“地震”,而对于消费者来说,这一切只是让大家越发看不清瓶装水的真面目,好似一位羞涩的新娘,迫不及待地盖起了盖头,让旁人难睹芳容。 相似文献
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也许你很难想像:对世界上大多数人而言,喝上一杯饮用水,并非像取一杯冰镇灌装水或厨房水槽里的水那样简单容易。对他们来说,获取饮用水是一项困难、费时,而且绝对必要的艰巨任务。1、饮用水来源于哪里?地表水地下水淡化海水以上种种答案:以上种种。这取决于你处在世界的哪个区域,你水龙头中的水可能来自地表水(如湖泊、河流、水库)、地下水, 相似文献
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