Purge and Trap Troubleshooting Made Easy?
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1 Purge and Trap Troubleshooting Made Easy? Tyler Trent- Application Chemist Preston Hoppes- International Tech Support/FSE Tammy Rellar- Application Sales Specialist Teledyne Tekmar
2 Purge and Trap Troubleshooting No Response Carryover/Contamination Elution issue- early, middle, late Water interference Internal Standard recovery variability Linearity/Reproducibility issues System leaks
3 Troubleshooting Tips Take a moment to review manuals Examine the facts and use valid reasoning Identify the root cause of the problem Avoid quick fixes and shotgun approach BE PATIENT!
4 Finding the Root Cause MS,GC, Concentrator, and Autosampler Split the system into 4 separate entities
5 Eliminate the GC/MS Not necessary to disconnect Purge & Trap (P&T) Confirm normal operation of the MS Tune parameters/vacuum Clean source Confirm normal operation of GC Do direct inject of same standard used in P&T Poor chromatography/resolution/reduced response Injection liner/septum Clip column Once GC/MS is eliminated as source of issue, proceed to P&T/ASM
6 Eliminate the Purge and Trap Confirm normal operation of the GC/MS Tune/direct inject Confirm normal operation of the P&T Run diagnostics/leak check Make sure the correct analytical trap is in place Manually load sample into Purge and Trap Eliminates the autosampler
7 No Response Are the analytes getting to the GC/MS Check the trap heater Reaches the set temperature Check 6-port valve Hear the 6-port actuate 6-port rotor installed correctly Correct installation of the 6-port valve
8 No Response Are the analytes getting to the trap Bubbles in the sparge tube during purging Correct flow set in method Mass flow controller working System leak tight Gas tank still have pressure
9 No Response Stratum
10 No Response Check Autosampler Is there sample in sparge vessel? Pressure problems Sample get pulled Valves working correctly Sample and drain valves
11 No Response AQUATek100
12 Carryover/Contamination Carryover for full target list/late eluters and contamination Run GC only Desorb only Check temperature Desorb/Bake Check hot water/meoh rinse
13 Carryover of Full Target List GC/MS Faulty EPC Purge and Trap Solenoid valve leaking cross port Faulty trap heater Sample not draining entirely Dirty glassware Autosampler Check soil vs. water if available System not rinsing correctly Internal standard valve leaking(allows standard to enter vessel) Not transferring entire aliquot to Purge and Trap
14 Carryover of Late Eluters GC Inlet too cold Purge and Trap Not enough bake Bad trap Cold spots Transfer line connection to GC inlet Faulty condensate or trap heater Autosampler Check soils vs. waters if available Hot water heater/rinse failure Not enough bake rinses Sample needle not cleaning up Not transferring bake rinse to purge and trap
15 Carryover of Late Eluters AQUATek100
16 Contamination Issues? No problem! Able to rinse sample pathway with 90 C water Atomx uses methanol to rinse entire pathway Includes syringe, associated transfer lines and valves, sparger and 3-stage needle. User can vary volume and number of rinse times user settable within the software method
17 Data One 90 C Water Sparge Vessel Rinse Two 90 C Water Sparge Vessel Rinses Three 90 C Water Sparge Vessel Rinses 3mL Methanol Sparge Vessel Rinse mL Methanol Sparge Vessel Rinse 3mL Methanol Sparge Vessel Rinse and 3mL Methanol Needle Rinse
18 Elution Issues Tune Auto-tune/BFB tune Direct inject If missing peaks could be a bad EPC Column Top of Trap If missing peaks could be sample tubing/transfer line
19 Early Elution Groups GC Split flow leak Bad column Purge and Trap Small leak Water front too large Too long of dry purge Trap too hot (faulty electronics or heater)
20 Middle Elution Groups (Very Rare) GC Column phase is bad Purge and Trap Desorb preheat problems Condensate trap has too much water Mass flow controller leaking Bad Trap
21 Late Elution Groups GC/MS Source maintenance Carrier flow too low Purge and Trap Poor purge efficiency Restrictive sample tubing Dirty glassware Sample not heated properly Plugged vent valve Bad Trap
22 Water interference MS Vacuum issues GC Split flow too low Bad column Purge and Trap Condensate setting and or failures Dry purge not optimized Sample temperature concerns (too hot) Desorb Time
23 Water Interference Chromatogram showing the water front for a 2min desorb (white) compared to 4min desorb (green)
24 Water Interference Chromatogram showing the water front for a 2min desorb at 1ppb (white) compared to 4min desorb at 1ppb (green)
25 Internal Standard Recoveries GC/MS response increases as Target compound concentration increases Dirty inlet liner or source Validate by preparing 3 increasing target concentrations with Internal Standard concentration fixed in 1mL vials and then direct inject 1uL of the concentrations into the GC If still increasing isolate between source and liner by performing cleaning and or replacement. 6mm draw-out plate
26 Internal Standard Recoveries Purge and Trap Isolated to an active site Sample tubing/condensate trap/analytical trap Autosampler Hand spike vials first Automated delivery system Tubing restrictions Valve malfunction Pressure problems
27 Internal Standard Recoveries AQUATek100
28 Linearity and Reproducibility GC/MS Source maintenance Vacuum problems EPC failures Bad column Method not optimized Oven temperature program Multiplier going bad
29 Linearity and Reproducibility Purge and Trap Method not optimized Trap is failing Drain valve leaking Excess water in system Temperatures not reaching set-points Too much carry over Sample preparation errors Dirty standard syringe or glassware Too much headspace Analyst variability
30 Linearity and Reproducibility Autosampler Not pulling same amount of sample Not transferring sample correctly Improper rinsing between samples Compare soils vs. water if possible Determine if IS is varying and causing everything else to look unstable
31 Purge and Trap System Leaks Perform Leak Checks through Software:
32 Purge and Trap System Leaks
33 Purge and Trap System Leaks Since the Atomx is an Autosampler and P&T concentrator combined, the leak check is more complex If fails the overall leak check it will break down into three subsystems
34 Purge and Trap System Leaks Subsystem A Mass flow controller, Bake valve, Purge valve, Pencil Filter, Purge select valve, Syringe valve, and Pressurize valve
35 Purge and Trap System Leaks Subsystem B All subsystem A, Syringe,7-port valve, Transfer valve, Sample needle, and Soil valve
36 Purge and Trap System Leaks Subsystem C All of subsystem A&B, Sample mount, Sparge vessel, Drain valve, and 6-port Valco Notice traps not included so failure of system with A, B, and C passing indicates leak in trap area
37 Benchmark Make sure system is leak tight first Checks all system controls including solenoid valves, heaters, flows, and 6-port valve Helps isolate a variety of potential issues
38 Miscellaneous Issues Draining sample -Flag on Hamilton Valve -Drain Valve Communication with GC/MS -Standard 63 -User 31 History Log -To check Purge/Bake pressures -To check Errors and Modes they occurred in
39 Tech Support
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