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8脗楼: Originally posted by 碌脣脩漏0632 at 2020-10-21 16:22:09
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脳卯潞贸拢卢脦脪脪陋脳枚 ...

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pH is measured in soil water suspension. During pH measurement , the soil particles should be kept in suspension by stirring just before dipping the electrode. Actually what we are measuring is the concentration/ activity of H+ ions present in soluble form( soil solution phase) and those H+ ions dissociated from soil particle surfaces (from the exchange sites of soil particles).The H+ concentration/activity in soil-water suspension decreases with increasing dilution of the suspension and , hence, the measured pH increases.That means the wider the soil : water ratio, the higher will be the measured pH.
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学习了学习了，一直做水质的ph检测，也帮别人做过土壤的ph检测，但当时只是按照他们给的操作方法和实验室合适的ph传感器做了，没考虑过原理的事情，当时也问了大家为啥非要特定的比例用去离子水稀释，大家都是说标准就那么规定的，今天才明白。