Gas Chromatography Analysis

GC-ECD is a specialized gas chromatography technique that uses an electron capture detector to identify compounds with high electronegativity, particularly halogens. The detector employs a radioactive source to ionize the carrier gas, and when electronegative compounds pass through, they capture electrons—resulting in a measurable drop in current. This makes GC-ECD exceptionally sensitive to substances like chlorinated pesticides, PCBs, and other persistent organic pollutants.

GC-FID is a gas chromatography method that uses a flame to ionize organic compounds as they exit the chromatographic column. These ions are then detected and quantified, providing precise measurements of compound concentrations. GC-FID is especially effective for analyzing non-polar organic compounds such as solvents, fuels, and industrial emissions.

Headspace GC-MS combines the separation and identification power of GC-MS with automated sample preparation in a sealed vial. The sample is heated, and only the vapor above it—the "headspace"—is introduced to the GC column, eliminating matrix interference and extending column life.

At RJ Lee Group, we run this on the Agilent 8890 GC, 5977C MSD Inert Plus, 7693A Autosampler, and 8697 Headspace Sampler—a robust single-quadrupole platform built for both routine quantitation and unknown identification. This configuration delivers high sensitivity (ppb levels), excellent reproducibility, minimal matrix interference, and automated high-throughput workflows.

Applications include residual solvents in pharmaceuticals (USP <467>), VOCs in soil and water (EPA 5021A, 5035, 8260), outgassing and packaging studies, unknown volatile identification, and trace contamination troubleshooting across pharmaceutical, food, and forensic samples.

RJ Lee Group brings decades of experience in environmental testing and industrial forensics. Our GC-ECD services are backed by:

• ISO-accredited laboratories and legally defensible methodologies.
  
  
• Expertise in trace-level detection across diverse sample types.
  
  
• Integrated analytical platforms for multi-technique investigations.
  
  
• Mobile laboratory capabilities for near-real-time field analysis.
  
  
• Customized method development to meet unique client needs.
  
  

We don’t just deliver data—we deliver insight. Our scientists work closely with clients to interpret results in context, helping you make informed decisions with confidence.