Gerhardt Trace Metal Reflux Digestion System SMA 8s

Overview

The Gerhardt Trace Metal Reflux Digestion System SMA 8s is a fully automated, electrically heated digestion platform engineered for trace metal analysis in environmental, food, clinical, and regulatory laboratories. It implements closed-vessel reflux digestion—a thermally controlled, acid-mediated sample decomposition process that ensures quantitative recovery of volatile and refractory elements (e.g., As, Hg, Se, Cd, Pb) while minimizing contamination and analyte loss. Unlike open-beaker hotplates or microwave-assisted systems, the SMA 8s maintains consistent reflux conditions across all eight positions via independent PID-controlled heating blocks, enabling method reproducibility essential for ISO/IEC 17025-accredited testing and GLP-compliant workflows. Its design prioritizes operator safety, spatial efficiency, and long-term method stability—critical for routine QA/QC labs performing ICP-MS, ICP-OES, or AAS sample preparation.

Key Features

• Fully automated operation with programmable sequence control: up to 99 user-defined methods, each supporting up to 40 discrete temperature/time stages and variable ramp rates (0.1–20 °C/min), ensuring precise thermal profiling for diverse matrices (soil, tissue, sludge, plant material).
• High-precision temperature regulation: ±0.1 °C accuracy across the full 30–240 °C operating range, achieved through calibrated Pt100 sensors embedded directly in each digestion block.
• Compact footprint (515 × 483 mm base area) optimized for space-constrained laboratories; total height 990 mm (without auto-lift option).
• Dedicated reflux condenser assembly with integrated cooling water management—compatible with optional automatic solenoid valves for timed coolant flow initiation and drainage.
• Motorized multi-stage lift mechanism (standard on SMA 8s configuration) enables safe, ergonomic loading/unloading of 250 mL digestion tubes without manual lifting or tilting.
• Integrated fume extraction interface: standard connection for water-jet aspirator or optional TURBOSOG® acid gas scrubbing system (CE-certified, corrosion-resistant PTFE/PFA construction) with automatic activation synchronized to digestion start/stop events.

Sample Compatibility & Compliance

The SMA 8s accommodates standard borosilicate glass or quartz digestion tubes (up to 250 mL volume), compatible with HNO₃, HCl, HF, H₂O₂, and aqua regia mixtures under reflux conditions. It supports digestion protocols aligned with EPA Method 3050B, 3051A, 3052; ISO 11466; EN 13656; and ASTM D3682. The system’s controller logs all critical parameters—including setpoint temperatures, actual block temperatures, stage durations, and error flags—with timestamped records compliant with ISO/IEC 17025 data integrity requirements. Audit trail functionality, user access levels, and electronic signature support are available via optional software modules meeting FDA 21 CFR Part 11 and EU Annex 11 expectations for regulated environments.

Software & Data Management

The detachable controller unit features a high-contrast TFT display and intuitive rotary encoder navigation. All 30 preloaded digestion methods (e.g., for sediment, biological tissue, polymer ash) are editable and exportable via USB. Raw temperature/time logs and method execution reports are stored internally (≥10,000 cycles) and exportable as CSV or PDF. Optional Gerhardt LabControl™ software enables remote monitoring, centralized method distribution, instrument fleet diagnostics, and integration into LIMS via OPC UA or MODBUS TCP. Data encryption, role-based permissions, and immutable audit trails ensure compliance with GLP, GMP, and ISO 17025 documentation standards.

Applications

• Preparation of certified reference materials (CRMs) for trace element certification.
• Digestion of wastewater sludge and sediments prior to heavy metal speciation by HPLC-ICP-MS.
• Food safety testing per EU Regulation (EC) No 1881/2006 for Cd, Pb, and inorganic As in rice and infant formula.
• Clinical toxicology sample prep (whole blood, urine) for multi-element quantification at sub-ppq levels.
• Pharmaceutical excipient screening per USP / elemental impurities protocols.

FAQ

Does the SMA 8s support reagent addition during digestion?
No—the SMA 8s is a dedicated reflux digestion system without integrated reagent dispensing. It is designed for static-acid, sealed-reflux protocols where reagents are manually pre-loaded into tubes prior to insertion.
Can it be used with hydrofluoric acid (HF)?
Yes, when equipped with quartz digestion tubes and TURBOSOG® acid scrubber (HF-rated); standard glass tubes are not HF-compatible.
Is validation documentation provided?
Gerhardt supplies IQ/OQ documentation templates, calibration certificates for Pt100 sensors, and factory performance verification reports traceable to DKD/DAkkS standards.
What maintenance is required?
Annual verification of temperature uniformity across all 8 positions and condenser efficiency; no consumable parts beyond standard lab-grade tubing and coolant filters.
How is cooling water managed?
The system accepts standard tap water or recirculating chillers (max. 25 °C inlet); optional automatic solenoid valves enable scheduled coolant flow and drain cycles synchronized to method steps.