CHLORINE AND BROMINE: METHOD 6011, Issue 2, dated 15 August 1994 - Page 4 of 5
REFERENCES: [1] [2]
[3]
[4]
Cassinelli, M.E. Development of Solid Sorbent Monitoring Method for Chlorine and Bromine with Determination by Ion Chromatography, Appl. Occup. Environ. Hyg., 6:215-226 (1991). NIOSH Manual of Analytical Methods , 2nd ed.; Taylor, D.G., Ed.; V. 1, P&CAM 209; U.S. Department of Health Education and Welfare, Public Health Service, Centers for Disease Control, National Institute for Occupational Safety and Health; DHEW (NIOSH) Publication No. 77-157, 1977. Occupational Safety and Health Administration Analytical Laboratory: OSHA Analytical Methods Manual, Method No. ID-101). American Conference of Governmental Industrial Hygienists: Cincinnati, OH, 1985; Publ. No. ISBN: 0-936712-66-X. Occupational Safety and Health Administration Analytical Laboratory: OSHA Analytical Methods Manual, (Method No. ID-108). American Conference of Governmental Industrial Hygienists: Cincinnati, OH, 1985; Publ. No. ISBN: 0-936712-66-X.
METHOD WRITTEN BY: Mary Ellen Cassinelli, NIOSH/DPSE
APPENDIX A: CLEANING PROCEDURE FOR SILVER MEMBRANE FILTERS NOTE: Some lots of silver membrane filters contain extremely high chloride background levels. If excessively high this cleaning procedure will not remove all of the chloride, even if repeated several times. Screening is necessary for each lot before being used for this method. Screening may be done by following this procedure at least twice, or by analyzing by XRD. 1. 2. 3. 4. 5.
Place each filter in a 30-mL, wide-mouth bottle, and add 3 mL 6 m M Na 2S2O 3. Allow to stand for a minimum of 10 min with occasional swirling. Discard solution and rinse thoroughly with deionized water. Allow the filters to stand in last rinse for a few minutes. Remove filters from bottles and dry between layers of absorbent laboratory towels. Store cleaned filters between paper disks in manufacturer's container. Filters are stable for at least 8 months.
APPENDIX B: COLUMN RECONDITIONING PROCEDURE In the following order, pump through the analytical columns at 2 mL/min: a. 30 mL deionized water to rinse; b. 60 mL 1 M HNO 3 to remove contaminants; c. 30 mL 0.1 M Na 2CO 3 to remove the NO 3-; d. Eluent to equilibrate. Reconditioning is recomended after 100 to 150 analyses.
NIOSH Manual of Analytical Methods (NMAM), Fourth Edition, 8/15/94
