Varian Archon Purge-and-Trap Autosampler for Water and Soil Analysis

Overview

The Varian Archon Purge-and-Trap Autosampler is a dedicated sample introduction system engineered for automated, high-reproducibility volatile organic compound (VOC) analysis in environmental matrices—primarily aqueous samples (e.g., drinking water, wastewater, groundwater) and solid-phase samples (e.g., soil, sediment, sludge). It operates on the principle of dynamic headspace extraction: inert gas purges VOCs from the sample into a sorbent trap, followed by rapid thermal desorption directly into a gas chromatograph (GC) or GC–mass spectrometer (GC–MS). Designed for compatibility with Varian (now Agilent) GC platforms—including the CP-3800 and 430-GC—the Archon integrates seamlessly into EPA Method 502.2, 524.2, 524.4, and ASTM D6059 workflows. Its modular architecture supports both liquid and solid sample handling via interchangeable sample probes and sparge heads, enabling method flexibility without hardware reconfiguration.

Key Features

• Two configurable tray formats: 51-vial or 81-vial capacity for unattended operation over extended batch runs
• Dual-mode sampling capability—liquid-phase (water) and solid-phase (soil/sediment) with integrated sparge tube and soil probe assemblies
• Precise temperature-controlled purge, trap, and desorption zones compliant with EPA-defined thermal profiles
• Integrated leak-check and pressure-monitoring circuitry ensuring method integrity and data traceability
• Robust pneumatic control system using mass flow controllers (MFCs) for reproducible purge gas delivery (helium or nitrogen)
• Onboard diagnostics and status LED indicators for real-time operational feedback and troubleshooting
• Factory-calibrated trap heater and desorption oven with ±1 °C thermal stability across 0–350 °C range

Sample Compatibility & Compliance

The Archon accommodates standard 40-mL VOC vials (EPA-compliant amber glass), 25-mL soil jars with septa, and custom containers up to 100 mL volume. Solid sample handling utilizes a heated sparge probe with programmable agitation to enhance VOC release kinetics from heterogeneous matrices. All fluidic pathways are constructed from inert, silanized stainless steel and PTFE-lined tubing to minimize analyte adsorption and carryover. The system meets design requirements for EPA Methods 502.2 (halogenated hydrocarbons), 524.2 (purgeable aromatics and halocarbons), and 524.4 (drinking water VOCs), and supports GLP/GMP-aligned audit trails when paired with compliant GC data systems. It is compatible with USP , ISO 10301, and ASTM D6059 for VOC quantification in regulatory testing laboratories.

Software & Data Management

The Archon interfaces via RS-232 or optional Ethernet module with Varian’s Star Chromatography Workstation (v6.x and later) and Agilent ChemStation (with appropriate driver configuration). Method parameters—including purge time (0–30 min), bake time (0–15 min), desorption temperature ramp rates, and trap conditioning cycles—are fully programmable and stored in instrument memory. Audit trail functionality records operator ID, method version, run timestamps, and critical event logs (e.g., pressure deviations, trap saturation alerts). When operated under FDA 21 CFR Part 11-compliant environments, electronic signatures and user-access controls can be enforced through integrated LIMS or third-party compliance software.

Applications

• Regulatory compliance testing for VOCs in municipal drinking water per EPA Safe Drinking Water Act (SDWA) standards
• Site assessment and remediation monitoring of chlorinated solvents (e.g., TCE, PCE, vinyl chloride) in groundwater and soil cores
• Wastewater treatment plant influent/effluent profiling for aromatic and aliphatic hydrocarbons
• Soil vapor intrusion studies requiring sub-ppb detection limits for benzene, toluene, ethylbenzene, and xylenes (BTEX)
• Method validation and QC/QA support in accredited environmental testing laboratories (ISO/IEC 17025)

FAQ

Is this unit refurbished or used-as-is?
This Archon autosampler is a pre-owned instrument that has undergone full functional verification at SpectraLab Scientific’s ISO 9001-certified calibration facility. All critical subsystems—including purge gas delivery, trap heating, valve sequencing, and tray positioning—were validated against original Varian specifications.
Does it include the purge-and-trap concentrator module?
No—the Archon is the autosampler only. It requires connection to a separate purge-and-trap concentrator (e.g., Varian 4000 P&T or Agilent 4500 P&T) and a GC or GC–MS system for complete VOC analysis.
What documentation accompanies the unit?
Each unit ships with its original operation manual, calibration report, test log summary, and a signed certificate of functional verification. No original software media is included; licensed copies must be sourced separately per vendor terms.
Can it be integrated with modern Agilent GC systems?
Yes—via RS-232 communication and appropriate firmware mapping. Integration with Agilent 7890/8890 GCs and MassHunter software is achievable with minor configuration adjustments and third-party driver support.
Is extended warranty or service support available?
SpectraLab Scientific offers optional post-warranty service contracts, remote diagnostics, and on-site technical assistance for international clients. Spare parts inventory is maintained for all major Archon subassemblies, including valves, heaters, and tray motors.