流体試料用光電光度計の試作水中鉄(III)の連続定量への応用

概要

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Design and use of a photometer for the flowing samples are described. The photometer consists essentially of a double-beam optical system, an amplifier, and a continuous flow cell assembly. The amplifier contains two devices : first, the logarithmic amplifier which provides direct readings of absorbancies and, second, the electronic switching systems using a phototube and transistors. The comparison was made in stabilities between the proposed photometer and a conventional spectrophotometer with stationary solutions. Standard deviations for the two photometers were of the same order.<BR>Besides, the continuous flow cell and the proportioning compartment for mixing reagents with samples at constant ratio are described. Iron(III) in water was continuously determined with thiocyanate as the colorant in the range of 1.87 to 8.99 ppm within 4% of variation.