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1.土壤的吸收性铵可分为两部分,一部分易在蒸汽蒸馏情况迅速解吸。称之为“易解吸性铵”;另一部分则只能在强碱性条件下被蒸馏出来,称为“非解吸性铵”。2.对于红黄壤,“易解吸性铵”可能是R_2O_3引起的一种物理性吸附,其吸附量随介质的pH 值的增高而迅速增大。高岭土和斑脱土的“易解吸性铵”量很低,且与介质pH值无关。所有试样的“非解吸性铵”均与介质pH 无关。3.“易解吸性铵”中有29—45%可以在干燥器(放CaCl_2)中因脱水而损失。4.红壤的“易解吸性铵”量,与电解质浓度(低于0.1N 时)的关系,完全服从Freun-dlich 方程式。其“非解吸性铵”则与浓度无关。5.铵质土的pH 与“易解吸性铵”含量具有一定关系,它可表示为:pH=αD+b;其中D 为“易解吸性铵”的每百克土壤中毫当量数;α为常数,在本试验中对于红壤标本其值为0.88,b 相当于“易解吸性铵”数值为零时铵质土的pH 值。6.用於洗涤的酒精浓度的变化,对于斑脱土的吸收性铵的总量不起影响,但对于土壤试样,则随酒精浓度的降低而减少其吸收性铵的总量,而其减少的部分,几乎全为“易解吸性铵”。
1. Absorption of soil Ammonia can be divided into two parts, part of the steam distillation in the case of rapid desorption. Known as “desorption of ammonium”; the other part can only be distilled under strong alkaline conditions, known as “non-desorption of ammonium.” For red and yellow soil, “easily desorbed ammonium” may be a kind of physical adsorption caused by R_2O_3, and its adsorption capacity increases rapidly with the increase of pH. Kaolin and bentonite soil “desorbable ammonium” is very low, and has nothing to do with the media pH value. The “non desorbed ammonium” of all samples was independent of the pH of the medium. 3. 29-45% of “desorbable ammonium” can be lost by dehydration in the dryer (CaCl 2). 4. The amount of “easily desorbable ammonium” in red soil is completely consistent with the Freun-dlich equation when it is related to the electrolyte concentration (less than 0.1 N). Its “non-desorption of ammonium” has nothing to do with the concentration. 5. The pH of ammonium soil has a certain relationship with the content of “easily desorbed ammonium”, which can be expressed as: pH = αD + b; where D is the milliequivalents per hectare of soil with “desorptive ammonium”; α Is constant, the value of red soil samples in this experiment is 0.88, b is equal to the pH value of ammonium soil when the value of “easily desorbed ammonium” is zero. 6. The change in the concentration of alcohol used for washing did not affect the total amount of absorbent ammonium in bentonite soil but for soil samples it decreased its total amount of absorbing ammonium as the alcohol concentration decreased, Reduce the part, almost all for “desorbable ammonium.”