Metash AA-3600 Flame and Graphite Furnace Atomic Absorption Spectrometer
| Brand | Metash Instruments |
|---|---|
| Origin | Shanghai, China |
| Manufacturer Type | Direct Manufacturer |
| Instrument Type | Flame and Graphite Furnace AAS |
| Monochromator | Plane Grating (1800 lines/mm) |
| Optical System | Double-Beam |
| Detector | Photomultiplier Tube (PMT) |
| Background Correction | Deuterium Lamp |
| Spectral Resolution | <0.03 nm |
| Sensitivity | Cu 1 ppm → Absorbance >0.01 A |
| Precision (RSD) | ≤0.05% (Flame mode, optimized conditions) |
| Detection Limits | Cu ≤ 0.006 µg/mL (Flame), Cd ≤ 1.0 × 10⁻¹² g (Graphite Furnace) |
Overview
The Metash AA-3600 is a dual-mode atomic absorption spectrometer engineered for high-precision elemental quantification in environmental, pharmaceutical, clinical, food safety, and metallurgical laboratories. It integrates flame atomic absorption (FAAS) and electrothermal graphite furnace atomic absorption (GFAAS) into a single platform, enabling trace- to major-element analysis across concentration ranges spanning six orders of magnitude. The instrument operates on the fundamental principle of atomic absorption spectroscopy: ground-state atoms in the vapor phase absorb characteristic radiation from hollow cathode lamps at element-specific wavelengths. Its double-beam optical architecture compensates for source intensity fluctuations and lamp drift, ensuring long-term photometric stability. The plane grating monochromator (1800 grooves/mm) delivers high spectral resolution (30-fold correction capability at 1 A absorbance.
Key Features
- Integrated flame/graphite furnace atomizer with fully automated switching and condition optimization—no manual reconfiguration required between measurement modes.
- Six-lamp turret with automatic lamp selection, alignment, and current adjustment—enabling rapid multi-element sequential analysis without operator intervention.
- Intelligent wavelength scanning: auto peak search, auto slit width selection (0.2/0.4/1.0/2.0 nm), auto negative high-voltage tuning, and real-time baseline stabilization.
- Comprehensive safety architecture: acetylene leak detection, continuous flame monitoring, automatic flame extinction shutdown, graphite furnace temperature and argon flow regulation, coolant flow interlock, and emergency power cutoff.
- Optimized graphite furnace design featuring uniform radial heating and semi-reflective D₂ beam balancing—minimizing chemical interferences, memory effects, and thermal gradients to enhance atomization efficiency and tube longevity.
- Modular expandability: compatible with Metash AS-3600 autosampler for unattended batch analysis, hydride generation accessories (e.g., for As, Se, Sb), and optional Zeeman background correction upgrade path.
Sample Compatibility & Compliance
The AA-3600 supports aqueous solutions, digested biological tissues, acid-leached soil extracts, and diluted industrial effluents. It complies with core international standard methods including ASTM D1688 (copper in water), ISO 11171 (trace metals in fuels), USP (heavy metals in pharmaceuticals), and EPA Method 7000B (flame AAS) and 7010 (graphite furnace AAS). Its hardware-level audit trail logging, user-access control, and electronic signature support align with GLP and GMP requirements. While not inherently 21 CFR Part 11–compliant out-of-the-box, its data acquisition software architecture allows integration with validated LIMS or ELN systems meeting regulatory documentation standards.
Software & Data Management
The proprietary Metash AAS Control Suite (v4.x) provides intuitive method development, real-time spectral visualization, multi-point calibration (linear/non-linear), QC flagging (e.g., drift alerts, signal-to-noise thresholds), and customizable reporting templates. All instrument parameters—including lamp current, slit width, burner height, furnace ramp profiles, and background correction status—are timestamped and stored in a relational database. Raw absorbance vs. time/spectrum files are exportable in ASCII and CSV formats for third-party statistical analysis (e.g., JMP, Minitab). Audit logs record user login/logout events, method modifications, and result overrides—facilitating internal review and external inspection readiness.
Applications
- Environmental monitoring: quantification of Pb, Cd, Cr, Ni, and Zn in drinking water per WHO guidelines (≤10 µg/L).
- Food and agriculture: determination of Fe, Mn, Cu, and Zn in fortified cereals and infant formula (AOAC 999.10).
- Clinical toxicology: ultra-trace Cd and Pb analysis in whole blood using GFAAS (detection limits ≤0.5 pg).
- Geochemical exploration: rapid screening of base metals in rock digests via flame AAS with RSD ≤1.0% (n=6).
- Pharmaceutical quality control: residual catalyst metals (e.g., Pd, Rh) in active pharmaceutical ingredients per ICH Q2(R2) validation criteria.
FAQ
What atomization techniques does the AA-3600 support?
It supports flame AAS, graphite furnace AAS, and hydride generation AAS (with optional accessory module).
Is the instrument compliant with FDA 21 CFR Part 11?
The base configuration meets technical prerequisites (audit trails, user roles); full Part 11 compliance requires site-specific validation of software workflows and electronic signatures.
Can the AA-3600 perform simultaneous multi-element analysis?
No—it performs sequential analysis via the six-lamp turret; true simultaneous detection requires ICP-OES or ICP-MS instrumentation.
What maintenance intervals are recommended for the graphite furnace?
Under typical usage (≤200 firings/week), graphite tubes should be replaced every 200–300 firings; platform cleaning and furnace alignment are advised quarterly.
Does the system support external autosamplers?
Yes—the AA-3600 is natively compatible with the Metash AS-3600 XYZ autosampler, supporting up to 144 sample positions and programmable dilution protocols.
