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土壤pH值的测量方法
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我是做环境土壤的,就把贴发到这个版吧。 流行的方法是水土比1:1混合来测,但有两个缺点,一是所测得pH值不稳定,另外就是所需要样品量为5G,当你的实验样品量比较少时很浪费样品。根据我的实验情况,我在网上找了相关的资料,分享一下: There are many different ways of measuring the pH of soil. Some use a saturated paste extract, others use a 1:5 dilution of soil: water, and then take a pH measurement on the resulting solution with a laboratory meter. Others use the 1:5 dilution, but instead of water they use a dilute Calcium Chloride (CaCl² solution. As a rough guide, the pH in CaCl² is usually 0.8 pH lower than in water, but can be as much as 2.0 pH units lower on grey sands. Ensure that you check the method used to measure you soil pH so that you are comparing similar methods.![]() 从上面的图片可以看到,加了CaCl² 之后pH变得非常稳定了,是因为Ca2+交换了土壤中的被吸附的H+。 根据你的需要选择合适的方法吧。详细情况请看原文http://www.eutechinst.com/techtips/tech-tips6.htm |
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2楼2009-03-11 16:25:23










solution. As a rough guide, the pH in CaCl² is usually 0.8 pH lower than in water, but can be as much as 2.0 pH units lower on grey sands. Ensure that you check the method used to measure you soil pH so that you are comparing similar methods.
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