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自从液膜硝酸根离子电极问世以来,经过大约十年左右的发展,其线性检测下限达到了10~[-5]M NO_3左右,并在土壤、水及食品等的NO_3测量中,得到了应用。但由于液膜电极采用了惰性微孔撑膜的结构,限制了其稳定性和重现性的进一步提高,给它的应用带来一定的不便。近些年来,在国外PVC膜硝酸根离子电极不但稳定性和重现性比液膜硝酸根电极好,而且线性检测下限也比液膜提高近半个数量级,为6×10~(-6)MNO_3~(-[4-5]),给应
Since the advent of liquid film nitrate ion electrode, the linear detection limit of 10 ~ [-5] M NO_3 has been achieved after about ten years of development and it has been applied to the measurement of NO_3 in soil, water and foodstuffs. . However, due to the structure of the inert membrane, the stability and reproducibility of the membrane electrode are further increased, which brings some inconveniences to its application. In recent years, the foreign PVC membrane nitrate ion electrode is not only stable and reproducible than the liquid membrane nitrate electrode, and the lower limit of linear detection than the liquid membrane increased by nearly half an order of 6 × 10 -6, MNO_3 ~ (- [4-5]), should be