引用回帖:

8脗樓: Originally posted by 碌脣脩漏0632 at 2020-10-21 16:22:09
脨祿脨祿脛煤碌脛祿脴麓冒隆攏碌蘆脦脪脠脭脫脨脪脡脦脢隆攏
脢脳脧脠脠莽鹿沒脫脨脳茅路脰脫毛脣廬路麓脫婁碌脛祿擄攏盧錄脫脣廬潞貿(mào)碌脛脝陸潞芒脪脝露爐攏盧脡煤魯脡錄卯脨脭?shù)撀姑娒嚸嬛櫭惷斆幟�脰脢攏盧虜?shù)撀得兟睹该柭獢n祿
脝盲麓脦脠莽鹿沒脙祿脫脨路麓脫婁攏盧脣廬脰祿脢脟碌樓麓驢碌脛🙏脧隆脢脥脳梅脫脙碌脛祿擄攏盧脫婁賂脙祿謾脠玫祿爐ph,
脳卯潞貿(mào)攏盧脦脪脪陋脳枚 ...

脦脪脪脩戮顱脦脢脕脣脳枚脥脕脠脌碌脛陸脤脢脷脕脣攏盧脮脪碌陸賂眉潞脧脌鉚碌脛陸芒脢脥攏盧脤霉脭脷脮芒鹿漏麓貿(mào)錄脪虜脦驢錄
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.
脳脺陸謾脝冒脌麓脢鹵脫脙脣廬脠樓脠脺陸芒脥脕脠脌攏盧脠祿潞貿(mào)虜芒露簍脡脧脟氓脪潞脢脟鹵脠陸脧潞脙碌脛路陸路簍攏盧祿貌脮脽脢脟脥簍脫脙碌脛路陸路簍隆攏脣霉脪脭脦脪脌鉚陸芒碌脛脢脟攏盧脦脪脙脟脪陋脫脙脳卯魯攏脫脙潞脥脕梅脨脨碌脛脠脺陸芒鹵脠攏盧虜壟脟脪脭脵賂忙脰陋ph碌脛脰廬脟擄攏盧脪陋賂忙脰陋脠脺陸芒鹵脠脢脟露脿脡脵攏盧脪貌脦陋脠脺陸芒鹵脠脠路脢碌脢脟祿謾脫擄脧矛ph碌脛
，

學(xué)習(xí)了學(xué)習(xí)了，一直做水質(zhì)的ph檢測(cè)，也幫別人做過土壤的ph檢測(cè)，但當(dāng)時(shí)只是按照他們給的操作方法和實(shí)驗(yàn)室合適的ph傳感器做了，沒考慮過原理的事情，當(dāng)時(shí)也問了大家為啥非要特定的比例用去離子水稀釋，大家都是說標(biāo)準(zhǔn)就那么規(guī)定的，今天才明白。