推荐回答（3个）
让自来水变色的“罪魁祸首”是电解器的铁棒电极。如果电解时使用铁棒这种非惰性电极，那么金属离子就会进入到水中，也会出现视频中水体变色变浑浊的现象。一般二价铁离子是绿色，三价铁离子是褐色，也就是网传视频中所谓的“脏东西”。
纯净水通电后变化不大，是因为它不含自来水中的微量余氯，电解性弱。所以，从实验结果来看，相同时间下，自来水产生的“脏东西”肯定比纯净水要来得多；但只要有足够长的电解时间，纯净水也会变色变浑浊。
扩展资料
绿色的是亚铁离子,由于铁会被氧化生成铁离子或亚铁离子,在有足够的铁单质的存在的情况下,可以保证主要存在亚铁离子!漂白粉中的氯可以为亚铁离子提供阴离子!
絮状漂浮物质是氢氧化亚铁和其它杂质（如电解出 的气泡）的混合体.也可能是自来水中的用来杀菌的Cl气与阳极的Cu棒发生了一些复杂的反应,铜棒上的铜失去电子以后以Cu离子的形式进入水中而引起的变色。
参考资料来源：百度百科-方形水质电解器
★ 警惕两种误导消费者的水质测试
一、电解水实验
用一个带有4根金属棒的电解器，接上两杯水，同时接通电源，让自来水或超滤净水器过滤后的水电解形成棕色或灰绿色的絮状沉淀，误导消费者认为水质有问题或说买的净水器不合格。这是一种不正当推销净水器误导消费者的骗局，几年前就已经被工商执法人员和媒体多次曝光，在一些大城市已经声名狼藉，但这种骗术目前有向农村渗透的趋势。
水质电解器有两组电极，每组电极由铁棒和铝棒组成，据供水公司水质化验人员介绍，自来水或超滤净化水中含有钙镁等导电离子，电解器阳极的铁棒放入自来水或超滤净化水后，是电解器电极上的铁被电解后形成氢氧化铁（灰色）、二价铁离子（绿色）、三氧化二铁（红褐色）、四氧化三铁（黑色）；而纯净水或蒸馏水中不含导电的钙镁等离子，不发生电解反应，故纯净水或蒸馏水不变色。如果用矿泉水、矿化水或放少许食盐的纯净水做实验，水照样会变色。
各种说法都有，但是有一些情况我也希望有专家出来解释解释，例如，自来水和井水，山洞里的山泉水，检测可溶性颗粒的质差不多，也就是导电的效果是一样的，但是电解后，井水因为收周边环境影响，例如农作物的肥料农药等，电解后呈现绿色和蓝色，同一个地方，在山洞里取出来的水电解却是微黄，自来水，在检测出有余氯残留的时候电解也会由黄变成浅绿或者浅蓝，还有红色漂浮物，同一个水龙头，当在居民用水量很大的时段，检查不出余氯残留，电解就不会出现绿色或者蓝色，这是为什么呢，望专家解释
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