Polytech PPM32 Positive-Pressure Solid Phase Extraction System

Overview

The Polytech PPM32 Positive-Pressure Solid Phase Extraction (SPE) System is an engineered solution for high-throughput, reproducible sample preparation in environmental, pharmaceutical, food safety, and clinical laboratories. Unlike vacuum-based SPE manifolds—where flow rates vary unpredictably due to column clogging or manifold leakage—the PPM32 employs a regulated, constant positive-pressure gas delivery system. This architecture ensures uniform solvent and sample migration across all SPE cartridges via precisely controlled pneumatic force, minimizing channel-to-channel variability and maximizing analyte recovery consistency. The system operates on the fundamental principle of pressure-driven liquid-phase partitioning: analytes are selectively retained on sorbent beds (e.g., C18, silica, ion-exchange phases) under defined flow dynamics, then eluted under optimized conditions. Its design prioritizes method robustness, GLP-compliant workflow integrity, and seamless integration into regulated analytical pipelines—including those aligned with EPA Method 508.1, 525.3, ISO 17993, and USP .

Key Features

• Four independently controlled extraction channels, each supporting up to eight 1 mL, 3 mL, 6 mL, or 12 mL SPE cartridges—enabling concurrent processing of up to 32 samples per run.
• Dual-pressure and dual-flow-rate configuration: distinct pressure setpoints (e.g., 10–60 psi) and volumetric flow control (via precision needle valves) for activation, washing, and drying steps—critical for maintaining sorbent bed integrity and preventing breakthrough or channeling.
• Dedicated drying channel with independent pneumatic actuation: delivers dry nitrogen or compressed air directly to cartridge frits without cross-contamination, ensuring complete solvent removal while preserving thermolabile analytes.
• Motorized, cylinder-driven sample rack elevation: guarantees consistent, leak-free sealing between cartridge ports and gas manifolds—eliminating manual alignment errors and enhancing inter-run reproducibility.
• Modular upgrade path to 16-channel large-volume water sampling mode: accommodates sequential loading of up to 16 × 1 L aqueous samples using programmable peristaltic pumps and integrated fraction collection—ideal for EPA 537.1 or PFAS monitoring workflows.
• Universal collection vessel compatibility: accepts standard 10 mL glass tubes, 15 mL and 50 mL conical centrifuge tubes—enabling direct transfer to Polytech EVA32 nitrogen evaporation systems without intermediate pipetting, thereby reducing analyte loss and contamination risk.

Sample Compatibility & Compliance

The PPM32 supports a broad range of sample matrices including surface water, wastewater, drinking water, plasma, urine, soil extracts, and food homogenates. It is compatible with all commercially available SPE sorbents (silica, Florisil®, alumina, C8, C18, SCX, SAX, mixed-mode phases) and certified reference materials (CRMs) used in proficiency testing schemes. The system’s mechanical and pneumatic architecture meets ISO/IEC 17025:2017 requirements for equipment verification, and its operational parameters are traceable to NIST-calibrated pressure transducers. When deployed in regulated environments, the PPM32 supports audit-ready documentation through integration with LIMS and electronic lab notebooks (ELNs), and its pressure/flow logs comply with FDA 21 CFR Part 11 data integrity principles when paired with validated software.

Software & Data Management

While the base PPM32 operates via intuitive front-panel controls with LED status indicators and tactile valve adjustment, optional firmware upgrades enable RS-485 or Ethernet connectivity for remote monitoring and protocol scripting. All pressure setpoints, dwell times, and flow profiles are logged with timestamped metadata—exportable as CSV or XML for QC review. The system does not include proprietary cloud services; instead, it interfaces with third-party laboratory informatics platforms (e.g., LabVantage, Thermo Fisher SampleManager) via standardized OPC UA or RESTful API protocols. Audit trails capture user ID, parameter changes, and runtime anomalies—fully supporting GxP validation and internal quality audits.

Applications

• Multi-residue pesticide analysis in drinking water per EPA Method 525.3
• Per- and polyfluoroalkyl substances (PFAS) quantification in groundwater using EPA Draft Method 1633
• Pharmaceutical residue screening in wastewater influent/effluent (EU Water Framework Directive)
• Endocrine-disrupting compound extraction from human serum prior to LC-MS/MS analysis
• Myco-toxin cleanup in cereal extracts prior to HPLC-FLD detection
• Heavy metal chelation and preconcentration from acidic digests using iminodiacetate-functionalized cartridges

FAQ

Does the PPM32 require external nitrogen supply or can it operate with compressed air?
Yes—it accepts either oil-free compressed air (filtered to ISO 8573-1 Class 2) or nitrogen (≥99.998% purity); pressure regulators and particulate/moisture traps are recommended for both sources.
Can I validate the flow rate accuracy per channel?
Each channel includes a calibrated needle valve and inline pressure gauge; users may verify flow using gravimetric measurement with certified volumetric flasks and analytical balances traceable to SI units.
Is the PPM32 compatible with robotic liquid handlers for unattended operation?
Yes—its digital I/O interface supports TTL-level start/stop triggers and status feedback, enabling synchronization with autosamplers (e.g., CTC PAL, Gerstel MPS) in fully automated workflows.
What maintenance is required to ensure long-term pressure stability?
Quarterly inspection of O-rings, annual calibration of pressure sensors, and biannual replacement of inline filters are recommended per the manufacturer’s maintenance schedule (documented in ISO 9001-certified service manuals).