1991 年 7 巻 5 号 p. 703-707
The quenching of chemiluminescence between cyclohexane and methylsilicone solid polymer was applied to the determination of water in nonaqueous solutions using a flow injection method. The proposed system comprises one single flow line and is expected to serve as a rapid, simple and highly selective method. The analytical time required was less than 4s for a single run. Although 10(v/v)% tetrahydrofuran and 10(v/v)% acetonitrile gave interfering signals of a few percent to the quenching response of a 0.7(v/v)% solution of water, thirty five ionic species (such as metal ions) did not interfere with the quenching signal of water, even when their concentration was as large as 1×10-2M. The detection limit was 0.1(v/v)% for 10μl sample injection, and the relative standard deviation was 2.3% in 10 repeated runs involving 10μl injections of 1.0(v/v)% solutions of water. The present method was compared with that of Karl Fischer by analyzing actual samples, coolant and hydraulic fluids used for automobiles; the values obtained by the two methods agreed well with each other.