论文部分内容阅读
使用锥形氯离子选择性电极和钠离子选择性电极,研究了在田间直接测定原位土壤中的氯化钠平均活度问题。在一般的田间水分条件下,氯电极和钠电极插入土中后,一般10分钟以内可以达到平衡电位。土壤含水量和NaCl量愈高,平衡时间愈短,在田间持水量时,2—5分钟以内即可平衡。电极长期使用后,土壤胶粒的粘附可影响氯电极的性能,干土对钠玻璃电极的脱水作用可影响钠电极的性能。二者可分别用细砂纸擦拭和用水湿润电极的办法消除。用本法研究了土壤剖面中PNaCl的变化、氯离子和钠离子含量的剖面分异、几种土壤的含盐状况以及土壤中PNaCl的微域差异,并与电导法结果做了比较。
Conical chloride ion selective electrodes and sodium ion selective electrodes were used to study the direct determination of the average activity of sodium chloride in situ soils in the field. In general field moisture conditions, chlorine electrode and sodium electrode into the soil, the general equilibrium potential within 10 minutes can be reached. Soil moisture and the higher the amount of NaCl, the balance of time is shorter, in the field when the amount of water, 2-5 minutes to balance. After long-term use of the electrode, the adhesion of soil colloids can affect the performance of the chlorine electrode. The dehydration effect of dry soil on the soda glass electrode can affect the performance of the sodium electrode. The two can be wiped with fine sandpaper and wetted with water to eliminate the electrodes. Using this method, the change of PNaCl, the profile of chloride ion and sodium ion in soil profile, the salt status of several soils and the difference of PNaCl in soil were studied. The results were compared with those of conductivity method.