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自来水烧开只能解决微生物的问题


自来水,肉眼看似很干净的,然而又有哪些是我们看不到的?我国饮用水净化专家,清华大学环境学院的教授刘文君、王占生在很多不同场合反复强调的观点:

1、自来水标准是照顾到我国广大的地域实际水质情况而设置的,是最基本的安全线,形象地说,自来水合格的标准相当于考试的60分,只是一条及格线。

2、自来水106项指标并不能完全穷尽各种对人体有害的元素,只是常见的有害物质。所以即使106项指标全部合格,也不能保证还有106项指标以外的有害物存在。

3、自来水安全标准是基于统计学的数据,是一个安全的基本保障线。在实际生活中,因为个体体质差异,使得每个人对有害物质的耐受性各不相同,对于那些耐受力低于平均水平的人来说,对绝大多数的人安全的含量,对他却可能是危险的甚至致命的。 

4、有些有害物质的作用是逐步累积的,如重金属。即使安全剂量的有害物,在体内积累到一定量时,也会引发疾病。

5、自来水中余氯总是存在的,因为氯气是自来水工艺中故意加进去的,而余氯对人体健康是不利的。

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自来水中的污染物主要分为以下几大类:

固体悬浮物:泥沙、铁锈、红虫到肉眼可见物

微生物:细菌、病毒、藻类等

溶解无机物:消毒副产物、硫酸铜、氯化物、硝酸盐

重金属:汞、砷、铅、镉、铬等

有机物:各类工业用染料、清洁剂、消毒剂、农药、抗生素

放射线粒子:核工业及核医学等产生的放射线粒子


李复兴说,解决饮水健康问题,有三道防线:

(一)从水的源头抓起,必须是二类水以上,可是目前饮用水的源头基本都超过了三类水;

(二)城市供水保障体系,估计20年也解决不了,现在任何国家和社会,目前都没有能力来统一解决人们健康饮水的问题,工业化和农业的现代化以及社会发展的同时,对水的污染越来越厉害;

(三)家庭自我保障体系,较现实的有效办法就是自己解决终端饮水健康问题。

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国家虽已下大力气改善供水条件,但浩大的输水管网改造工程绝非短时间内就能奏效。要尽快解决饮用健康水的问题,既要靠国家努力,也要靠自身的努力。

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