Chlorine Sampling TechniquesThe OSHA sampling and analysis method for chlorine is discussed in Reference 9.1. The principle of sampling is described in reference 9.2. The analytical procedure is based on an iodometric technique that uses a residual chlorine electrode (RCE) for detection (9.3.). Validation of the chlorine method included the following experimental studies: Analysis of a total of eighteen samples (six samples at each of three test levels) which were prepared by adding known quantities of standardized chlorine solution to a 0.1% sulfamic acid collecting solution. Analysis of a set of eighteen samples (six samples at each of three test levels) collected in dynamically generated test atmospheres at approximately 0.5, 1 and 2 times the permissible exposure limit (PEL) of the OSHA of 1 ppm. Determination of collection efficiency of 0.1% sulfamic acid sampling solution. Determination of potential breakthrough during sampling. Determination of 30-day storage stability of collected samples. Comparison with an independent method. Method evaluation. Details relating to each of these elements are discussed in the following sections. All experiments were based on the ability of the method to collect and analyze a 15 L air sample for each concentration tested. Sample preparation and analytical technique used during method evaluation follow those described in Reference 9.4. A revised method (9.1.) is also available.-------------------------------------- -----------------------------------------Note: The revised version of the method ( 9.1.) differs on a major point from reference 9.4. : Preparation of samples and standards for analysis. This is now...... middle of paper ...... uh for chlorine gas using aqueous sulfamic acid collection medium and specific ion electrode analysis. Appl. Occupy. Approximately. Hyg. 5(10): 700-706 (1990).9.6. Analytical Instrument Development, Inc.: Model 350 Standards Generator Operation and Maintenance Manual. Avondale, PA: Analytical Instrument Development, Inc., 1977.9.7. National Institute for Occupational Safety and Health: NIOSH Validation Test Documentation by D. Taylor, R. Kupel, and J. Bryant (DHEW/NIOSH Pub. No. 77-185). Cincinnati, OH: National Institute for Occupational Safety and Health, 1977. pp. 7-11.9.8. American Society for Testing and Materials: Recommended Standard Practices for Apparatus, Reagents, and Safety Precautions for the Chemical Analysis of Metals (Annual Book of ASTM Standards, Part 12, E-50). Philadelphia, Pennsylvania: American Society for Testing and Materials, 1978.