Development of an Automatic Photometric Analyzer

Abstract

A new automatic photometric analyzer has been developed as a series of studies on automation of wet chemical analysis of iron and steel samples. The developed analyzer (Photo. 1, Fig. 1) performs automatically and continuously all the photometric procedures after preparation of sample sulution usually by acid dissolution method. The above procedures were previously carried out by complicated and time-comsuming manual operation.
The analyzer is mainly composed of the injecting davice for sample solution, the adding device for reagent solutions and water, the device for developing color and measuring the absorbancy, the controlling device and the recording device. The third device is most characteristic and is composed of the reaction vessel and the solution circulating pipe with a gas blowing tube, a bubble eliminator, an absorbancy measuring cell and a drain cock.
The analyzer was applied to determination of phosphorus, silicon, manganese and acid soluble aluminum in steel samples. From 0.0005% to 0.1% of phosphorus was determined in 6 min for one determination on principle of molybdenum blue spectrophotometry. From 0.002% to 1% of silicon was determined in 6 min on principle of molybdenum blue spectrophotometry. From 0.001% to 1% of manganese was determined in 5 min on priciple of sodium periodate oxidization spectrophotometry. From 0.0005% to 0.01% of acid soluble aluminum was determined in 6 min on principle of eriochrome cyanine R spectrophotometry.