电导法确定水溶液中盐的浓度

Relation Between Concentration of Salt in Aqueous Solution and Its Conductivity

采用电导法研究了水溶液中盐的浓度与其电导率的关系。结果表明，在低浓度范围内电导率与浓度的平方根成线性关系；在较高的浓度范围内，首次发现浓度ρ与电导率ｋ间的定量关系为：ｋ＝ａｂρ（１＋ｂρ）－１或ｋ＝ａｂρ４（１＋ｂρ４）－１．

In this paper,the relation between concentration of salt in aqueous solution ( ρ ) and its conductivity ( κ ) has been studied with conduction method.The results show that the κ of salt solution is directly to square root of its ρ in lower concentration,and relation between κ and ρ is following: κ=abρ(1+bρ) -1 or κ=a 1b 1ρ 4(1+b 1ρ 4) -1 in higher concentration.The concentration of salt can be determined very fast by using the method of this paper.