T/QAS 008-2019 Brine Determination of Sulfate Ion in Brine by Ion Chromatography

Scope

Main Technical Content: 3. Principle: Sulfate ions and other anions in the water sample enter the anion exchange separation system (consisting of a guard column and an analytical column) with the carbonate system eluent. Based on the different affinities of the analytical column for various ions, the anions are separated. The separated anions flow through the anion suppression system and are converted into highly conductive strong acids, while the eluent is converted into low-conductivity weak acids or water. The conductivity of various anion components is measured by a conductivity detector, and the qualitative analysis is based on retention time, while the quantitative analysis is based on peak area integration. 4. Reagents and Materials: Unless otherwise specified, all reagents used in the analysis are of high-purity grade and meet the requirements of GB/T 6682 for analytical laboratory water. a) Sulfate standard solution (1 mg/mL): commercially available; b) auxiliary gas: high-purity nitrogen, not less than 99.9%. 5. Instrumentation and Equipment: The main instruments and conditions involved in the experiment are as follows (unmentioned items refer to Appendix A). a) Ion chromatograph; b) analytical balance (with a sensitivity of 0.1 mg). 6. Samples: The samples are stored in sealed plastic buckets. 7. Analysis Steps: 7.1 Sample Preparation: After appropriate dilution, accurately transfer 10 mL of the sample to a 100 mL volumetric flask and make up to the mark with distilled water. Then transfer 5 mL of the sample to a 100 mL volumetric flask and make up to the mark with distilled water. The sample is ready for analysis. 7.2 Preparation of Standard Solutions: According to Table 1, successively dilute the sulfate standard solution (a) to 100 mL in a volumetric flask, dilute to the mark with water, and shake well. Table 1: Standard Working Solutions (units: mg/L) 1234567 SO42- 0.00 0.55 25 50 100 200 7.3 Sample Testing: Using a syr

Development Information

Related Standards