Analysis of Silicon in Industrial Products, Etc. Using Continuous Flow Analysis

Kumazawa Y

Published on: 2021-11-25

Abstract

While there are existing methods including the gravimetric method specified in JIS M 8214 for analyzing silicon, which is a substance contained in steel and other materials at a certain level or higher, these methods have problems regarding the complex analysis procedures and the accuracy of analysis. In addition, it is difficult to measure the silicon content in the low concentration range with ICP-OES or ICP-MS due to the elution of silicon from the device or mass interference. It is therefore accepted in general to adopt the method based on “silicon tetrafluoride vaporization separation-molybdenum blue spectrophotometry,” which is used in JIS methods in Japan, where the silicon contained in the sample is separated as a gas and collected in the absorbing solution to be measured. However, this method also has issues in the separation time (30 minutes) and measurement sensitivity (5 μg/g). We therefore developed a new method using continuous flow analysis equipment (CFA method).