Gas Chromatographic Determination of ppm-Level Carbon Tetrachloride in Wastewater Using a Flame Ionization Detector and Nitrogen Carrier Gas for Manufacturing Process Control

A simple and accurate analytical method was developed for determining carbon tetrachloride (CCl4) at the ppm level in wastewater from the manufacturing process as part of process monitoring and control. In this method, CCl4 was extracted from wastewater using toluene and analyzed by gas chromatography (GC) equipped with a flame ionization detector (FID) and an OVI-G43 capillary column (film thickness: 3 μm; inner diameter: 0.53 mm; and length: 30 m）, with nitrogen as the carrier gas. The proposed method was validated in terms of its specificity, linearity, accuracy, and repeatability. The regression curve demonstrated excellent linearity (r = 1.000, r2 = 1.000) over a concentration range of 0.5–10 ppm. The mean recovery at concentrations between 0.5 and 5 ppm was 90 %, and the relative standard deviation for repeatability was 2.0 %. The limit of quantification was 0.5 ppm based on the linearity and accuracy results. The proposed method requires only simple liquid–liquid extraction, a versatile GC-FID system, and a sustainable carrier gas (nitrogen), making it highly suitable for the analysis of CCl4 at manufacturing sites.