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将电渗析仪改装成电超滤的装置,用羊皮纸做半透膜,把仪器分隔为三室,在中间室放置土壤样品,在两边室间外加电场,在一定时间的间隔内,测定K~+进入阴极室的量,可获得电超滤的解吸曲线。测定四种不同的土壤,解吸曲线在200伏和400伏的范围内都出现一个最高解吸速率。用热力学方法来处理,得出最高解吸速率(V)的式子如下: 式中表示电超滤解吸最高速率与土壤表面的K~+活度(a±),土壤的表面电位(ψ土),外电场的强度(△ψ外)和阴极室K~+活度(a外)等因素有关。当a外和△ψ外一定时,则其最高速率的位置,可以作为土壤钾素供应的势标度。
The electrodialysis device into a device of electric ultrafiltration, semi-permeable membrane made of parchment, the instrument is divided into three rooms, soil samples were placed in the middle room, plus an electric field between the two rooms at a certain interval of time, the determination of K ~ + Into the cathode chamber volume, available ultrafiltration desorption curve. Four different soils were measured and the desorption curve exhibited a maximum desorption rate over both 200 and 400 volts. Thermodynamic method to get the highest desorption rate (V) of the formula is as follows: Wherein, said the highest rate of UF adsorption and the soil surface activity K ~ + (a ±), the soil surface potential (ψ soil) , The external electric field strength (△ ψ outside) and the cathode chamber K ~ + activity (a outside) and other factors. When a outside and △ ψ outside a certain time, then the location of the highest rate, can be used as potential scale of soil potassium supply.