Chlorine Sampling TechniquesOSHA sampling and analytical method for chlorine are 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.). The validation of the chlorine method consisted of the following experimental studies: Analysis of a total of eighteen samples (six samples for each of the three test levels) that were prepared by adding known quantities of standardized chlorine solution to the sulfamic acid collection solution at 0.1%. Analysis of a series of eighteen samples (six samples for each of three test levels) collected from dynamically generated test atmospheres at approximately 0.5, 1, and 2 times the OSHA Permissible Exposure Limit (PEL) of 1 ppm. Determination of collection efficiency of 0.1% sulphamic acid sampling solution. Determination of potential passage during sampling. Determination of 30-day storage stability for collected samples. Comparison with an independent method. Evaluation of the method. Details are discussed with respect to each of these elements in the following sections. All experiments were based on the method's ability to collect and analyze a 15-liter air sample for each concentration tested. The sample preparation and analytical technique used during method evaluation follow those described in reference 9.4. A revised method is also available (9.1.).----------------------------------------- -------- -----------------------------------------Note : The revised version of the method ( 9.1.) differs in one important point from reference 9.4.: Preparation of samples and standards for analysis. Now it's... middle of paper... for chlorine gas using an aqueous sulfamic acid collection medium and specific ion electrode analysis. Appl. Occupy. Environment. Ig. 5(10): 700-706 (1990).9.6. Analytical Instrument Development, Inc.: Model 350 Standard Generator Operation and Service Manual. Avondale, PA: Analytical Instrument Development, Inc., 7.9.1977. 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 (ASTM Annual Book of Standards, Part 12, E-50). Philadelphia, PA: American Society for Testing and Materials, 1978.