Agilent AA280Z Graphite Furnace Atomic Absorption Spectrometer
| Brand | Agilent Technologies |
|---|---|
| Origin | Malaysia |
| Model | AA280Z |
| Instrument Type | Graphite Furnace AAS |
| Monochromator | Echelle Grating |
| Optical System | Single-Beam |
| Detector | Photomultiplier Tube (PMT) |
| Background Correction | D₂ Lamp + Zeeman Effect |
| Resolution | 0.3 nm |
| Sensitivity | 0.3 pg Cu |
| RSD (Repeatability) | ≤0.3% |
| Detection Limit (DL) | 0.006 pg for Cd |
| Baseline Stability | ±0.005 absorbance units/30 min |
Overview
The Agilent AA280Z is a high-performance graphite furnace atomic absorption spectrometer engineered for ultra-trace elemental analysis in complex matrices. It employs AC-modulated Zeeman-effect background correction—a robust physical method that eliminates spectral interferences without compromising analytical sensitivity. Unlike conventional deuterium lamp correction, Zeeman correction provides simultaneous, wavelength-matched background measurement across the entire spectral line profile, enabling accurate quantification even in samples with severe non-specific absorption (e.g., biological digests, environmental sludge, or high-salt food extracts). The instrument integrates the GTA 120 Zeeman graphite furnace atomizer, featuring programmable temperature control, integrated argon gas management, and real-time furnace status monitoring. Its single-beam optical path—optimized around an echelle grating monochromator—delivers high spectral resolution (0.3 nm) and efficient light throughput, supporting precise line selection for over 70 elements including As, Pb, Cd, Cr, Ni, and Se.
Key Features
- AC-modulated Zeeman background correction with computer-controlled magnetic field (0.1–0.8 T), maintaining field stability during measurement to minimize power supply drift effects.
- Fixed 8-lamp turret with automatic lamp selection and alignment—enabling rapid multi-element method switching without manual intervention.
- GTA 120 graphite furnace atomizer with integrated temperature ramping profiles, dynamic gas flow control, and real-time thermal monitoring for reproducible atomization.
- UltrAA hollow cathode lamps delivering up to 5× higher radiant intensity than standard HCLs—critical for sub-picogram detection limits and extended lamp lifetime.
- SRM (Sequential Ramp Method) Wizard and Tube-Cam visualization tool for systematic method development: optimizing drying, ashing, and atomization temperatures; selecting appropriate matrix modifiers (e.g., Pd-Mg, NH₄H₂PO₄); and determining optimal sample injection volume (1–50 µL).
- Modular hydride generation (VAG) compatibility via optional adapter—extending analytical capability to hydride-forming elements (As, Sb, Bi, Se, Te, Pb) with sub-pg detection performance.
Sample Compatibility & Compliance
The AA280Z accommodates liquid samples (aqueous acids, organic solvents, diluted biological fluids) and solid micro-samples via direct slurry introduction. Its Zeeman architecture ensures reliable quantification in high-background matrices such as seawater, soil extracts, clinical serum, and pharmaceutical excipients. The system supports full compliance with international regulatory frameworks: ASTM D396, D5174, EPA Methods 200.9 and 7000B, ISO 11170, and USP . Data integrity meets FDA 21 CFR Part 11 requirements through secure user authentication, electronic signatures, and full audit trail logging—including all parameter changes, calibration events, and raw signal acquisition timestamps.
Software & Data Management
Controlled by Agilent’s proprietary SpectrAA software, the AA280Z provides a validated, GxP-ready environment for method creation, execution, and reporting. The software includes embedded uncertainty estimation tools per ISO/IEC 17025 guidelines, automated QC checks (calibration verification standards, continuing calibration verification), and customizable report templates compliant with GLP/GMP documentation standards. All raw absorbance vs. time curves, peak area integrations, and background-subtracted signals are stored in vendor-neutral .csv and .xml formats. Data export supports LIMS integration via ODBC and HL7 interfaces.
Applications
The AA280Z delivers validated performance in regulated and research environments requiring trace metal quantification at sub-pg levels. Typical use cases include: lead and cadmium testing in children’s toys per CPSIA; arsenic speciation support in rice and groundwater analysis; residual catalyst metal screening in API synthesis (ICH Q3D); nickel and chromium validation in stainless steel leachates (ASTM F2129); and ultratrace cobalt monitoring in lithium-ion battery electrolytes. Its VAG compatibility further enables routine compliance testing for inorganic arsenic in infant formula per EU Commission Regulation (EU) No 2023/915.
FAQ
What background correction methods does the AA280Z support?
It combines dual-mode correction: D₂ lamp for broad-band correction and AC-modulated Zeeman effect for high-precision, line-specific background removal—automatically selected based on element and matrix complexity.
Is the GTA 120 furnace compatible with platform and stabilized temperature modes?
Yes—the GTA 120 supports both transversely heated graphite tube (THGA) platforms and integrated temperature stabilization logic to minimize radial temperature gradients and improve precision.
Can the AA280Z be upgraded to support hydride generation?
Yes—via the optional VAG (Vapor Generation Accessory) module, which mounts directly to the graphite furnace autosampler and interfaces seamlessly with SpectrAA software.
Does the system meet GLP data integrity requirements?
Yes—SpectrAA software includes full 21 CFR Part 11 compliance features: role-based access control, electronic signatures, immutable audit trails, and secure data archiving.
What is the typical detection limit for cadmium using Zeeman correction?
Under optimized conditions (Pd-Mg modifier, pyrolysis at 800 °C, atomization at 1800 °C), the characteristic mass (m₀) is ≤0.006 pg Cd, consistent with published IUPAC definitions of detection limit for graphite furnace AAS.
