A simple and portable colorimeter using a red-green-blue light-emitting diode and its application to the on-site determination of nitrite and iron in river-water.
A portable colorimeter using a red-green-blue light-emitting diode as a light source has been developed. An embedded controller sequentially turns emitters on and off, and acquires the signals detected by two photo diodes synchronized with their blinking. The controller calculates the absorbance and displays it on a liquid-crystal display. The whole system, including a 006P dry cell, is contained in a 100 x 70 x 50 mm aluminum case and its mass is 280 g. This colorimeter was successfully applied to the on-site determination of nitrite and iron in river-water.
Suzuki
Yasutada
Y
Department of Applied Chemistry and Biotechnology, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi 4-3-11, Takeda, Kofu, Yamanashi 400-8511, Japan. yamatori@ab11.yamanashi.ac.jp
Aruga
Terutomi
T
Kuwahara
Hiroyuki
H
Kitamura
Miki
M
Kuwabara
Tetsuo
T
Kawakubo
Susumu
S
Iwatsuki
Masaaki
M