Buncha Sriviwattanakul. A devised detector tube for determination of xylene in working area . Master's Degree(Industrial Hygiene and Safety). Mahidol University. : Mahidol University, 2003.
A devised detector tube for determination of xylene in working area
Abstract:
The purpose of this study was to construct a detector tube for the determination of xylene in working areas. The indicating reagent was prepared by coating potassium iodate solution onto the silica gel. The coated silica gel was packed into the blank glass tube and hermetically sealed at both ends of the tube by the liquid petroleum gas burner. The equilibrium reaction between xylene and the indicating reagent produced the red-brown color of iodine. The stainlength on the tube was indicated of xylene concentration. Experiment was conducted to test the xylene detector tube for overall accuracy, detection limit, specificity, storage stability and to compare it with commercial xylene detector tubes in the field. Results showed that the xylene detector tube could be used for the analysis of xylene in the air at the concentrations of 10 to 100 ppm with the detection limit of 10 ppm. The overall system accuracy for analysis of xylene in the air at 0.5 and 1.0 TLV was 21.24 and 21.96%, respectively. Toluene was an interference of the experimental xylene detector tube because it masked the xylene when they were mixed together. Regarding storage stability, the tube stored in refrigerators could be stable for more than 2 weeks. The field concentrations of xylene analyzed by the experimental and commercial xylene detector tubes were not significantly different. The results revealed that the studied xylene detector tube could be an effective and low cost detector tube for the analysis of xylene in working areas.