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发表于 2006-7-27 10:13:16
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来自: 中国浙江宁波
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(http://reefkeeping.com/issues/2003-12/rhf/feature/index.htm)。<br /><br />我觉得该文深入浅出地解释了orp的一些原理及我们的水族箱中常见遇到的一些orp相关的现象,是一篇很好的文章。。。关于含氧量与orp的关系部分现摘录如下:<br /><br />原文:“Why does the ORP not change more when the concentration of oxygen is changed so much? <br />The simple answer is that equilibrium ORP is just not very sensitive to small changes in the concentration of oxygen. After all, ORP only varies over about 1000 mv from the most oxidizing to the most reducing environments found in natural waters. But the oxygen concentration might vary by a factor of 10^50 or more.<br /><br />Keep in mind that ORP is logarithmic in the same sense that pH is logarithmic. If you double the [H+], pH only drops by about 0.3 pH units. In the same way, doubling the [O2] has only a fairly small effect on ORP.”<br />翻译:“为什么当氧浓度发生很大的变化,ORP的值却不会有很大改变呢?<br />简单的回答是平衡的ORP值对氧浓度的小的改变并不十分敏感。毕竟,在自然界的水体中,从最极端的氧化环境到最极端的还原环境,ORP的值也只会有1000mv的变化。但是,氧浓度却会有10的5次方为因子的变化甚至更多。<br /><br />紧记ORP和pH一样都是对数关系。如果你把氢离子提高一倍,pH也只会降低0.3个单位。同样地,如果把氧分子提高一倍,对ORP也只有很小的影响”<br /><br /><br />原文:“Unfortunately, despite their vast numbers, the oxygen molecules are not very effective fighters. In many cases, they can swarm all over the enemy and still not prevail. The true leaders of the oxidizers are far less numerous, but considerably more potent fighters. These include ozone (O3), hydrogen peroxide (H2O2), triplet oxygen (3O2),”<br /><br />翻译:“不幸的,尽管他们数量庞大,氧分子却不是很有效的战士。很多时候,他们将敌人团团围住却无法取胜(**注:这里指发生化学反应,夺取对方电子)”。氧化剂真正的领导者数量要少得多,却更为有效。他们包括:臭氧(o3),双氧水(H2O2),三重态氧(3O2)。<br /><br /><br />总结一下我的理解:<br /><br />只有强氧化剂才能够对ORP值产生比较显著的影响,而氧分子并不是强氧化剂,所以他不会对ORP读数产生大的影响。另外,再自然界水体中(也包括我们的水族箱),氧浓度是以10的5次方为因数发生变化的,而ORP值最多却只有1000mv的变化,所以从这一点上来讲,氧浓度要发生非常大的变化,ORP值也只会发生很小的改变。 |
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