微量成分の冷凍濃縮における溶存物質の全濃度の影響

概要

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The effect of the total concentration of solutes on the recovery of a certain microchemical constituent in freeze concentration has been studied. When the sample solution is slowly frozen, formation of transparent ice starts from the vessel wall. The solutes are concentrated in the remaining solution and when the amounts of the solutes are small, the recoveries are close to 100 % even after a 100-fold concentration is achieved. However, when the total solute concentration in the remaining solution has reached a certain level (about 0.04 mol/dm^3), the ice eventually starts to occlude the solutes and becomes cloudy, in such a region the solute recovery suddenly falls down by a further progress of freezing and nearly no further concentration is achieved when the total solute concentration reaches about 0.1 mol/dm^3 due to increase in the occlusion of the solute in the ice. Under such conditions, the recovery of the coexisting microchemical constituent in the solution is also low. The freeze concentration method is applicable to solutions in which the total solute concentration is lower than 0.01 mol/dm^3.
社団法人日本分析化学会の論文
1981-09-05