储存温度与时间对市售饮用矿泉水和纯净水有毒物质释放的影响

The effects of storage temperature and duration on release of toxic substances from commercial drinking mineral water and purified water

由于饮用便捷、水质洁净、富含微量元素等优点,饮用矿泉水与纯净水深广大消费者的青睐。但饮用矿泉水与纯净水并非任何情况下都适宜饮用。例如,饮用时应以不加热、冷饮或稍加温为宜,不宜煮沸饮用;储存时应置于干燥阴凉通风处,避免阳光直射。文章以两种市售饮用矿泉水与两种市售饮用纯净水为研究对象,采用矿泉水或纯净水的藻类生态毒性效应作为评价指标,主要针对炎热的夏天汽车内高温与暴晒的储存条件,研究了储存温度与储存时间对市售饮用矿泉水与纯净水有毒物质释放的影响。结果表明,两种矿泉水与两种纯净水储存于50—70℃的大部分条件下,均呈现藻类生态毒性效应,均释放出有毒物质。且随着储存温度的升高,它们的藻类生态毒性效应增强,说明释放出的有毒物质含量更高、毒性更大。而储存时间为1—5 d时,对两种矿泉水与两种纯净水有毒物质的释放影响不明显。这为人们选择合适的饮用矿泉水与纯净水储存条件提供重要的参考依据,对于饮用矿泉水与纯净水的安全饮用具有重要意义。

Drinking mineral water and purified water are very popular because they are convenient and clean for drinking, and rich in trace elements. However, the drinking mineral water and purified water are not suitable for drinking in any cases. For example, they are appropriate for drinking when they are cold or a little warmer, but not suitable for drinking after boiled. They should be stored in a cool, dry and ventilated place, avoiding direct sunlight. In this study, the effects of the storage temperature and duration on the release of toxic substances from two commercial drinking mineral water and two commercial purified water were investigated to explore the effects of high storage temperature and duration on the bottled water in hot summer, using the algal toxicity of the mineral water and purified water as the evaluation index of the release of the toxic substances. The results showed that all of the two mineral water and two purified water presented algal toxicities and released toxic substances under most of the storage temperature （50-70 ℃）. And the algal toxicities of these water samples were enhanced with the increase of the storage temperature, which indicated that the content and the toxicities of the released toxic substances had raised resulting from the increase of the storage temperature. However, there was no obvious influence of the storage duration （1-5 day） on the release of toxic substances from two commercial drinking mineral water and two commercial purified water. These results can provide a basis for people to choose suitable storage condition of drinking mineral water and purified water, which are of great significance for the safe drinking mineral water and purified water.