1. 1. JIS K0101, “Testing methods for industrial water”, Japanese Industrial Standards Committee, Tokyo, 1995.
2. 2. JIS K0102, “Testing methods for industrial wastewater”, Japanese Industrial Standards Committee, Tokyo, 1995.
3. 3. R. Fukushima: Readout HORIBA Technical Report, 7, 39, 1993.
4. 4. K. Hayakawa, Y. Yoneda, Y. Okamoto, T. Kumamaru and M. Ikeda: Analytical Instrument Tokyo Conference 1996, Science University of Tokyo, 1996, Abstract p. 57.