📋 Workflow
Full workflow, products add-to-cart directly1
Tube conditioning
30 minCondition sorbent tubes by purging with high-purity nitrogen at high temperature
💡 Tip Seal tubes immediately after conditioning
⚠️ Caution Avoid contaminating the sorbent
🧪 Materials for this step (click to shop by spec/brand)
2
Sampling
60 minCollect a defined air volume with a constant-flow sampling pump
💡 Tip Record sampling volume, temperature and humidity
⚠️ Caution Calibrate pump flow rate
🧪 Materials for this step (click to shop by spec/brand)
3
Thermal desorption
30 minPlace the tube in a thermal desorber to desorb at high temperature for injection
💡 Tip Two-stage desorption improves recovery
⚠️ Caution Avoid cold trap carryover
🧪 Materials for this step (click to shop by spec/brand)
4
GC/MS analysis
40 minSeparate by GC and detect each VOC with MS
💡 Tip Identify using reference spectra
⚠️ Caution Periodically calibrate retention times
🧪 Materials for this step (click to shop by spec/brand)
5
Quant & report
30 minCalculate each VOC concentration by calibration curve and correct to standard volume
💡 Tip Convert to standard-condition volume concentration
⚠️ Caution Subtract field blank
🧪 Materials for this step (click to shop by spec/brand)
⚠️ 5 Common Beginner Mistakes
- ① Insufficient conditioning causing residue
- ② Inaccurate flow affecting volume
- ③ Sorbent breakthrough lowering results
- ④ Blank contamination raising background
- ⑤ Incomplete desorption losing components
❓ FAQ
+What sampling volume?
Per method and sorbent capacity, often 1–10 L.
+How to detect breakthrough?
Check a breakthrough tube for tail.
+Purpose of field blank?
Subtract contamination from transport/storage.