Revision History for Techniques and Methods 10-C8 Kinga Révész, Haiping Qi, and Tyler B. Coplen Determination of the delta-34S of Low-Concentration Sulfate in Water; RSIL Lab Code 1949 ----------------------------------------------------- First posted 2006, ver. 1.0 ----------------------------------------------------- Revised and reposted 2007, ver. 1.1 ----------------------------------------------------- Revised and reposted September 14, 2012, ver. 1.2 "delta-(34S/32S)" was replaced by "delta-34S" in the title to be in accordance with recommendations of the Commission on Isotopic Abundances and Atomic Weights of the International Union of Pure and Applied Chemistry. Tyler B. Coplen was added as a coauthor. "Summary of Procedure" and "Labware, Instrumentation, and Reagents" sections were updated to reflect new instrumentation. "Reporting Units and Operational Range" section was updated to reflect expression of delta values with number ratios. "Sample Collection, Preparation, Analysis, Retention Times, and Disposal" section was updated to reflect that samples are no longer submitted through the National Water Quality Laboratory (NWQL) and to document improved analytical techniques. "Data Acquisition, Processing, Evaluation, Quality Control, and Quality Assurance" section was updated to reflect that samples are no longer submitted through the National Water Quality Laboratory (NWQL). Three references were added to the "References Cited" section. Appendixes A and N were updated to reflect that samples are no longer submitted through the National Water Quality Laboratory (NWQL). Main text footer was removed from the document.