選択的気-液分離膜を用いた水中アンモニウムイオン測定システム

概要

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The sample solution containing ammonium ion and diethyl amine is pumped at the flow rate of 8 ml min^<-1> to the mixing joint, where a reaction solution (1% sodium hydroxide solution) is mixed at the rate of 4 ml min^<-1>. Then the mixture containing ammonia and amine is fed into a gas-liquid separator. The ammonia and amine permeate through three Teflon membranes (0.80 μm pore size, 0.1 mm thick, 82% porosity) into an absorption solution (10^<-2> M ammonium chloride solution) flowing at 2 ml min^<-1>. Since the porous wall of inner Teflon membrane is coated with an Armeen SD, aliphatic primary amine (C15), when ammonia and amine pass through the pore, the difference in the passing time between ammonia and amine can be observed. The response time of ammonia and diethyl amine were about 3.5 min and 4.8 min, respectively. Therefore, the ammonium ion could be determined separately from diethyl amine. The pH of absorption solution is measured with a glass electrode. The Nernstian response of electrode potential is valid with a relative standard deviation of less than 5% in the range between 1×10^<-1> and 1×10^<-4> M.
社団法人日本分析化学会の論文
1988-04-05