Measuring Organic Matter in Etching Solutions

This technical report outlines the use of the TOC-5000A total organic carbon analyzer for measuring organic matter concentration in etching solutions used for CRT shadow masks and printed circuit boards. The report details the deterioration of etching solutions due to increased organic matter concentration from impurities, which can slow down the etching speed. It describes the conventional methods of analysis that faced durability issues due to harsh chemical conditions. The report presents a recovery test methodology to ensure accurate measurement of organic matter without affecting the coexisting components in the etching solution. Measurement results before and after the etching process are documented, demonstrating the effectiveness of the TOC-5000A in providing accurate readings. The report concludes with several benefits of using the TOC-5000A, including ease of operation, fast measurement capabilities, and minimal maintenance requirements. Additionally, it lists potential applications of the analyzer in various fields beyond etching solutions.