TouchScience PTC-V Automated Purge and Trap Concentrator

Overview

The TouchScience PTC-V Automated Purge and Trap Concentrator is a fully integrated, high-throughput sample preparation system engineered for the quantitative extraction and preconcentration of volatile organic compounds (VOCs) from aqueous and solid matrices. Based on the standardized purge-and-trap principle—where inert gas continuously sweeps VOCs from the sample into a sorbent-packed trap—the PTC-V delivers reproducible, trace-level enrichment prior to thermal desorption and introduction into gas chromatography (GC) or GC-mass spectrometry (GC-MS) systems. Designed specifically for environmental, regulatory, and food safety laboratories, it supports rigorous compliance with U.S. EPA Method 502.2, 524.4, 624, and 8260 equivalents, as well as Chinese national standards HJ 639–2012, HJ 686–2014, and HJ 605–2011 for water, wastewater, soil, and sediment analysis.

Key Features

• 100-position automated sample carousel with barcode-ready compatibility for unattended operation over extended sequences
• Programmable electronic mass flow control (MFC) ensuring precise, repeatable purge gas delivery across all sample types
• Integrated cryogenic cold trap (liquid N₂ or mechanical cooling optional) enabling efficient low-temperature trapping of C2–C12 VOCs
• Direct-resistance heating of the sorbent trap for rapid, uniform thermal desorption with minimal memory effect
• Dual-zone temperature control: independently regulated purge vessel (ambient to 90 °C) and trap (50–400 °C), eliminating cold spots across all fluidic pathways
• Patented water management system (CN Utility Model Patent No. ZL202020125570.4) significantly reduces water vapor breakthrough to downstream GC/GC-MS, improving column lifetime and detector stability
• PEEK-lined and silanized stainless-steel fluidic path ensures chemical inertness and minimizes adsorptive loss of polar VOCs
• Onboard foam sensor detects excessive foaming during aqueous purging, triggering automatic pause to protect valves and transfer lines
• Configurable needle and purge tube rinse cycles—up to 5 washes per sample—to suppress carryover in high-concentration or complex matrices
• Heated solid-sample vial compartment with magnetic stirring capability for homogeneous slurry formation and efficient headspace equilibration
• Isolated backflush gas routing: desorbed analytes are directed exclusively toward the GC interface, preventing re-deposition into the purge tube and eliminating cross-contamination between samples

Sample Compatibility & Compliance

The PTC-V accommodates both liquid (e.g., drinking water, groundwater, leachates) and solid-phase samples (e.g., soils, sediments, sludges, food homogenates). Solid samples are processed via aqueous slurry preparation directly in heated vials with integrated magnetic stirring. All thermal zones—including six-port switching valves, transfer lines, and purge tubes—are actively heated and insulated to maintain consistent temperatures above dew point, ensuring quantitative VOC recovery. The system meets full functional alignment with ISO/IEC 17025 quality requirements for testing laboratories and supports audit-ready data integrity when operated under GLP or GMP conditions. Its design facilitates full traceability per FDA 21 CFR Part 11 when paired with compliant chromatography data systems (CDS).

Software & Data Management

Controlled via a dedicated Windows-based application with intuitive touchscreen interface (large-format LCD panel), the PTC-V enables complete method development, sequence scheduling, real-time monitoring, and event logging. Software modules support internal standard spiking at user-defined concentrations, automatic calibration curve generation, and synchronized GC start command via TTL or Ethernet trigger. Audit trails record all parameter changes, run logs, and operator actions with timestamped, non-erasable entries. Export formats include CSV, PDF reports, and native CDS-compatible .axx/.seq files for seamless integration with Thermo Fisher, Agilent, Shimadzu, and Waters platforms.

Applications

• Regulatory environmental testing: VOC quantification in drinking water (EPA 524.4), wastewater (EPA 624), and contaminated soils (EPA 8260D)
• Food and beverage aroma profiling: off-flavor compound identification (e.g., geosmin, 2-methylisoborneol, aldehydes) in dairy, wine, and packaged goods
• Pharmaceutical residual solvent analysis per ICH Q3C guidelines
• Forensic toxicology screening for volatile poisons (e.g., benzene, chloroform, carbon disulfide)
• Industrial hygiene monitoring of workplace air condensates and wipe extracts

FAQ

Can the PTC-V be used with third-party GC and GC-MS systems?
Yes. It features universal analog/digital I/O and TTL synchronization ports compatible with all major GC vendors without proprietary interface licensing.
Does the system support automated internal standard addition?
Yes—integrated syringe pump allows programmable spiking of deuterated or non-deuterated internal standards prior to purge initiation.
How is carryover minimized between solid and liquid samples?
Through independent thermal zoning, PEEK/silanized flow paths, configurable multi-stage rinsing, and physical separation of backflush gas routing.
Is method validation documentation available?
Comprehensive IQ/OQ protocols, performance qualification templates, and standard operating procedure (SOP) drafts are provided upon request for laboratory accreditation purposes.
What maintenance intervals are recommended for routine operation?
Trap cartridge replacement every 200–300 injections; quarterly calibration of MFC and temperature sensors; annual inspection of valve actuation timing and seal integrity.