LUMEX MGA-915MD High-Frequency Zeeman Graphite Furnace Atomic Absorption Spectrometer
| Brand | LUMEX |
|---|---|
| Origin | Russia |
| Model | MGA-915MD |
| Instrument Type | Graphite Furnace AAS |
| Monochromator | Concave Grating (1800 lines/mm) |
| Optical System | Dual-Beam |
| Detector | Photomultiplier Tube (PMT) |
| Background Correction | Zeeman Effect |
| Spectral Resolution | 0.3 nm |
| Sensitivity | 0.3 A (for Cu at 324.8 nm) |
| RSD (Repeatability) | <0.3% |
| Detection Limit (Cu) | <0.006 mg/L |
| Detection Limits (Typical) | Pb ≤ 0.05 µg/L, Cr ≤ 0.01 µg/L |
| Max Graphite Furnace Temperature | 2950 °C |
| Max Heating Rate | 7000 K/s |
| Argon Flow Rate (Ultra-High Purity) | <1 L/min |
| Wavelength Range | 190–900 nm |
| Dimensions | 800 × 570 × 390 mm |
| Weight | 75 kg |
| Power Supply | 380 V AC, 50 Hz (3-phase) |
| Cooling | Closed-Loop Recirculating Water System |
| Power Consumption | <0.2 kW (standby/analysis), <18 kW (atomization/cleaning) |
Overview
The LUMEX MGA-915MD is a high-performance graphite furnace atomic absorption spectrometer (GFAAS) engineered for trace and ultra-trace elemental analysis—particularly of toxic and essential metals—in complex matrices. It implements the Zeeman Atomic Absorption Spectrometry with High-Frequency Modulation (ZAAS-HFM), a physically robust background correction technique that eliminates spectral interferences without requiring deuterium lamps or mechanical choppers. Unlike conventional GFAAS systems relying on continuum-source correction, ZAAS-HFM employs high-frequency polarization modulation of the analytical light beam in combination with magnetic field-induced splitting of atomic absorption lines. This enables real-time, wavelength-specific background subtraction with high stability and minimal signal drift—even under demanding thermal ramp conditions. The instrument integrates electrothermal atomization within a pyrolytically coated graphite tube, delivering exceptional sensitivity (sub-ppt detection limits for key elements) and matrix tolerance across environmental, food, clinical, geological, and industrial applications.
Key Features
- Zeeman-effect background correction with high-frequency magnetic field modulation (ZAAS-HFM), ensuring accurate quantification in samples with high molecular absorption or scattering interference (e.g., biological digests, soil extracts, seawater).
- High-intensity, multi-element High-Frequency Electrodeless Discharge Lamps (HF-EDLs) — eliminating hydride generation requirements for As, Se, Sb, Bi, Te, and Hg while minimizing reagent-based interferences and improving measurement precision.
- 6-position automated lamp turret with software-controlled lamp selection and spectral line optimization, enabling rapid method switching and multi-element sequential analysis.
- Ultra-fast graphite furnace heating: up to 7000 K/s ramp rate, supporting precise temperature programming for optimized pyrolysis and atomization steps — critical for volatile element stabilization and refractory element volatilization.
- 55-position programmable autosampler compatible with standard 16-mm vials and Eppendorf® tubes; supports on-board dilution, standard addition, rinsing, and internal standard addition with volumetric accuracy ≤1 µL.
- Integrated closed-loop recirculating water cooling system — eliminating dependency on external chillers or tap water, enhancing operational continuity and lab space efficiency.
- Massman-style 28-mm graphite tubes and Lvov platform-coated variants supported; full compatibility with certified reference materials and established ASTM D3974, ISO 11171, and USP <231> protocols.
Sample Compatibility & Compliance
The MGA-915MD accommodates liquid samples (aqueous solutions, acid digests, enzymatic extracts, serum, urine) and solid samples following validated microwave-assisted or hot-block digestion (e.g., EPA Method 3050B, ISO 17294-2). Its robust Zeeman correction ensures reliable performance in high-salt, high-viscosity, or particulate-laden matrices—including wastewater sludge, marine sediments, plant tissues, food homogenates, and metallurgical residues. The system complies with GLP and GMP data integrity requirements through secure user authentication, full audit trail logging (including method parameters, calibration history, and raw signal files), and electronic signature support aligned with FDA 21 CFR Part 11 principles. Routine operation meets ISO/IEC 17025:2017 competency criteria for testing laboratories performing trace metal analysis.
Software & Data Management
Controlled via LUMEX’s proprietary SpectraSoft™ platform, the MGA-915MD offers intuitive method development, real-time signal visualization, and automated calibration (linear/non-linear), QC checks (spike recovery, duplicate analysis, bracketing standards), and report generation compliant with ISO/IEC 17025 Annex A. All raw absorbance/time profiles, peak area integrations, and background-corrected signals are stored in vendor-neutral formats (CSV, XML) for third-party statistical analysis or LIMS integration. Software includes built-in validation tools for linearity assessment (r² ≥ 0.999), limit of detection (LOD) calculation per IUPAC guidelines, and uncertainty propagation modeling per EURACHEM/CITAC QUAM guidance.
Applications
- Environmental Monitoring: Quantification of Pb, Cd, As, Cr, Ni, and Hg in drinking water (EPA 200.9), wastewater, soil leachates (TCLP/SPLP), and airborne particulates (PM2.5 filters).
- Food & Feed Safety: Screening for heavy metals per EU Commission Regulation (EC) No 1881/2006 and China GB 2762–2022, including rice, infant formula, seafood, and animal feed.
- Clinical & Biological Research: Trace element profiling in whole blood, serum, urine, and tissue biopsies — supporting studies in neurotoxicology, nutrition, and metabolic disorders.
- Geochemical & Mining: Analysis of exploration samples, ore concentrates, tailings, and refinery products per ASTM D5762 and ISO 15586.
- Industrial Process Control: In-line quality assurance for catalysts, battery materials (Li-ion cathodes), semiconductor-grade chemicals, and plating baths.
FAQ
Does the MGA-915MD require flammable gases or vacuum pumps?
No — it operates exclusively with ultra-high-purity argon as both purge and shield gas; no acetylene, nitrous oxide, or mechanical vacuum systems are required.
Is the instrument compatible with existing laboratory information management systems (LIMS)?
Yes — SpectraSoft™ supports ASTM E1384-compliant data export and ODBC connectivity for direct LIMS integration.
Can the system perform standard additions automatically?
Yes — the 55-position autosampler executes multi-point standard addition sequences with programmable dilution and mixing prior to injection.
What graphite tube configurations are supported?
Both standard Massman-type 28-mm tubes and pyrolytically coated tubes with integrated Lvov platforms are fully supported, including optional integrated platform and end-cap designs.
How is compliance with regulatory data integrity requirements ensured?
SpectraSoft™ enforces role-based access control, immutable audit trails, electronic signatures, and full traceability of all analytical events — meeting FDA 21 CFR Part 11 and EU Annex 11 expectations.
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