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鄧雪0632鐵蟲(chóng) (小有名氣)
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[交流]
土壤的pH怎么測(cè)?
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求助土壤專(zhuān)業(yè)大佬。 我有個(gè)問(wèn)題想請(qǐng)教一下:測(cè)定土壤的pH為什么要用去離子水按1:2.5的比例溶解,靜置后再測(cè)定溶液的pH呢?這樣的話(huà),去離子水的pH理論上等于7, 不管土壤是酸性還是堿性的,不都被稀釋了嗎?此刻再測(cè)得溶液的ph是不是就偏中性,從而產(chǎn)生了誤差呢?非土壤專(zhuān)業(yè),求解,謝謝 |
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+1/185
+2/146
+1/92
+1/82
+2/40
+1/33
+1/18
+1/15
+1/8
+1/7
+1/7
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+1/1
鐵蟲(chóng) (小有名氣)
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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 |
銀蟲(chóng) (小有名氣)
鐵蟲(chóng) (小有名氣)
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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(méi)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柮姅n盧虜?shù)撀得兟睹该柭獢n祿 脝盲麓脦脠莽鹿沒(méi)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)攏盧脦脪脪陋脳枚碌脛脢脟碌脙碌陸脥脕脠脌脰脨pH碌脛戮蘆脠路脰碌攏盧錄麓脢鹿脠莽脛茫脣霉脣碌攏盧脪虜?shù)撝櫶斆好壝好挼撁惵┟惵÷得刾H碌脛虜簍露爐碌脛隆攏 錄脠脠祿脮芒脢脟脥脕脠脌pH鹿煤鹵錨碌脛虜芒路簍碌脛祿擄攏盧脛脟脙麓脫婁賂脙脢脟脳錄脠路碌脛攏盧脣霉脪脭脦脪脧毛脰陋碌脌虜脵脳梅碌脛脭顱脌鉚隆攏 脭脵麓脦賂脨脨祿脛煤碌脛麓冒賂麓 |
新蟲(chóng) (小有名氣)
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