Describes an inert valving system for the analysis of ppb level volatile sulfur compounds in food grade carbon dioxide using the Agilent 6890.
The document details a method for analyzing ppb-level volatile sulfur compounds in food grade carbon dioxide using an inert valving system on the Agilent 6890 gas chromatograph. It highlights the importance of strict adherence to sample introduction hardware recommendations, specifically using Silcosteel treated components, to prevent contamination and ensure reliable operation for low-level detection.
The note presents experimental results using three sulfur-selective detectors: the Flame Photometric Detector (FPD), Atomic Emission Detector (AED), and Sulfur Chemiluminescent Detector (SCD). It compares their sensitivity and suitability for detecting specific impurities like hydrogen sulfide, carbonyl sulfide, and dimethyl sulfide at concentrations down to 25 ppb.
| Column | 105 m x 0.53 mm x 5 um DB-1 |
|---|---|
| Gas sampling valve loop | 1 cc |
| VI Inlet Temperature | 150 °C |
| FPD Hydrogen Flow | 50 mL/min |
| AED Cavity Temperature | 245 °C |
| SCD Furnace Temperature | 803 °C |
The study uses the Agilent Flame Photometric Detector (FPD), Atomic Emission Detector (AED), and Sievers Sulfur Chemiluminescent Detector (SCD).
All lines and the sample loop should be Silcosteel treated to provide the necessary inertness for low level sulfur analysis.