Tekmar Lumin Purge and Trap Concentrator

Overview

The Tekmar Lumin Purge and Trap Concentrator is a high-performance, laboratory-grade sample preparation system engineered for the quantitative extraction and preconcentration of volatile organic compounds (VOCs) from aqueous and semi-aqueous matrices. Based on the well-established purge-and-trap principle—where inert gas sweeps VOCs from liquid samples into a sorbent trap, followed by thermal desorption into a gas chromatograph—the Lumin delivers robust, reproducible performance across environmental, regulatory, and research applications. As the eighth-generation evolution of Tekmar’s legacy platform, it integrates decades of method validation experience with modern engineering rigor, supporting full compliance with U.S. EPA, ASTM, ISO, and Chinese HJ/GB standards for VOC analysis in drinking water, groundwater, wastewater, and soil leachates.

Key Features

• Programmable mass flow controller (MFC) enabling precise, repeatable control of purge gas flow rate and system pressure—critical for method reproducibility and inter-laboratory comparability.
• Thermally stable trap heating up to 350 °C ensures complete desorption of high-boiling-point VOCs (e.g., C₉–C₁₂ aliphatics, substituted benzenes) without carryover or degradation.
• Dual-volume purge capability (5 mL and 25 mL) allows method flexibility: low-volume mode enhances sensitivity for trace-level analytes (e.g., vinyl chloride, trichloroethylene), while high-volume mode improves detection limits for ultra-trace contaminants in clean matrices.
• Integrated high-temperature water rinse cycle minimizes residual contamination between runs—particularly essential when analyzing polar, reactive, or high-molecular-weight VOCs such as acrylonitrile, butyl xanthate, or terpenes (e.g., α-pinene).
• 84-position autosampler compatibility supports unattended operation for batch processing, reducing manual intervention and improving throughput in high-volume environmental testing labs.
• Modular trap architecture supports interchangeable, application-specific sorbent configurations—including Tenax®/Carboxen®/Carbon molecular sieve combinations—optimized for broad volatility ranges (C₂–C₁₄) and compound classes (halogenated hydrocarbons, BTEX, chlorinated solvents, oxygenates).

Sample Compatibility & Compliance

The Lumin is validated for direct analysis of raw and filtered aqueous samples—including potable water, surface water, groundwater, industrial effluents, and soil extracts—without derivatization or solvent addition. Its design meets stringent regulatory requirements for data integrity and audit readiness: full support for 21 CFR Part 11-compliant electronic records (when paired with compliant LIMS or GC software), automated audit trails, user-access controls, and method versioning. It is routinely deployed in laboratories accredited to ISO/IEC 17025 and operating under GLP/GMP frameworks. All listed Chinese standard methods (HJ 639–2012 through HJ 896–2017 and GB/T 5750.8–2023) are implemented via preloaded, fully documented method templates—each including calibration sequences, QC checks (e.g., continuing calibration verification, surrogate recovery), and reporting logic aligned with national reporting formats.

Software & Data Management

Instrument control and sequence management are handled via Tekmar’s proprietary ProFusion™ software—designed for seamless integration with major GC and GC-MS platforms (Agilent, Thermo Fisher, Shimadzu, PerkinElmer). ProFusion™ provides real-time monitoring of critical parameters (trap temperature ramp rates, purge flow stability, desorption dwell times), automatic fault logging, and configurable pass/fail criteria for system suitability tests. Raw method files include embedded metadata (operator ID, instrument serial number, date/time stamps) and support export in ASTM E1381-compliant ASCII format for third-party data review systems. Software updates are delivered via secure, digitally signed packages and include revision history traceable to ISO 9001-controlled development workflows.

Applications

The Lumin serves as a core front-end for VOC analysis in environmental compliance testing, including: regulated monitoring under the U.S. Safe Drinking Water Act (SDWA) and Clean Water Act (CWA); site characterization for brownfield remediation; wastewater discharge permitting (NPDES); and emerging contaminant screening (e.g., 1,4-dioxane, PFAS precursors). Its water-and-soil compatibility extends utility to TCLP and SPLP leachate analysis per EPA Method 1311/1312. In research settings, it enables kinetic studies of VOC volatilization, method development for novel sorbent traps, and validation of alternative purge gases (e.g., helium vs. nitrogen vs. argon) under controlled thermodynamic conditions.

FAQ

Is the Lumin compatible with both GC and GC-MS systems from non-Tekmar manufacturers?
Yes—the Lumin interfaces with all major GC and GC-MS platforms via standard analog/digital I/O and Ethernet-based command protocols. No proprietary hardware adapters are required.
Does the system support foam detection and suppression during purge for high-surfactant wastewater samples?
Yes—optional foam monitoring and active foam elimination modules are available, utilizing optical sensing and pneumatic venting to prevent column contamination and quantitation errors.
Can trap bake-out and conditioning be automated within a sequence?
Yes—ProFusion™ allows full scheduling of pre-run trap conditioning, post-run bake-out, and blank verification steps, ensuring consistent baseline integrity across multi-day batches.
What level of documentation is provided for IQ/OQ/PQ validation?
Tekmar supplies comprehensive validation documentation packages—including installation qualification checklists, operational qualification test protocols with acceptance criteria, and performance qualification templates aligned with ASTM D3613 and ISO/IEC 17025 Annex A.2.
How is carryover addressed for high-concentration samples such as landfill leachate?
The combination of high-temperature water rinse (up to 95 °C), elevated trap bake-out (350 °C), and optional cryo-focusing ensures 100 µg/L spikes.