Agilent AA240Z Zeeman Graphite Furnace Atomic Absorption Spectrometer

Overview

The Agilent AA240Z is a high-performance, Zeeman-effect graphite furnace atomic absorption spectrometer engineered for ultra-trace elemental analysis in complex matrices. It operates on the principle of AC-modulated Zeeman background correction—a robust physical method that separates analyte absorption from broadband molecular absorption and light scattering by applying a time-varying magnetic field across the graphite tube during atomization. This eliminates the need for deuterium or continuum-source correction, delivering superior baseline stability and sub-ppt detection limits for over 70 elements—including As, Cd, Pb, Se, and Tl—without spectral interferences. The system integrates the Agilent GTA 120 atomizer, featuring temperature-controlled platform heating and integrated argon gas management, ensuring precise thermal programming and minimized analyte loss. With its fixed-lamp turret accommodating up to four hollow cathode lamps and optimized optical path design, the AA240Z achieves exceptional signal-to-noise ratios and long-term measurement reproducibility—critical for environmental monitoring, clinical toxicology, pharmaceutical impurity testing, and regulatory compliance laboratories.

Key Features

• AC-modulated Zeeman background correction: Provides real-time, line-by-line correction without mechanical moving parts or dual-beam drift, enabling reliable quantification in high-salt or organic-rich samples.
• GTA 120 graphite furnace atomizer: Delivers stable, reproducible atomization with programmable ramp-and-hold temperature profiles, integrated platform-assisted drying/ashing/atomization, and automated gas flow control.
• PSD 120 autosampler: Supports up to 120 sample positions with variable injection volume (1–100 µL), programmable dilution, and matrix modifier addition—essential for high-throughput labs requiring trace-level precision.
• UltrAA high-intensity hollow cathode lamps: Generate enhanced radiant intensity without external power supplies, extending lamp lifetime while improving detection limits by up to 3× compared to standard lamps.
• Variable magnetic field control: Electronically adjustable field strength from 0.1 to 0.8 Tesla; field locking during measurement ensures immunity to line voltage fluctuations and thermal drift.
• Advanced software tools: SRM Wizard automates method development via empirical optimization of drying, ashing, and atomization temperatures; Tube-Cam provides real-time visual feedback on graphite tube condition and temperature uniformity.

Sample Compatibility & Compliance

The AA240Z accepts aqueous solutions, digested biological tissues, acid-leached soils, and diluted industrial effluents. Its stable-temperature-zone furnace design minimizes analyte volatilization and matrix-induced memory effects—particularly beneficial for high-boiling-point elements (e.g., V, Mo, Ni) and volatile species (e.g., As, Sb). The instrument supports ASTM D5600, ISO 11885, USP , and EPA Methods 200.9 and 7060. When deployed with validated software configurations and documented change control procedures, it meets GLP and GMP data integrity expectations. Audit trail functionality—including user login logs, method modification timestamps, and raw signal export history—is available under FDA 21 CFR Part 11-compliant deployment protocols.

Software & Data Management

Controlled by Agilent’s native Windows-based worksheet software, the AA240Z enables intuitive method setup, real-time signal visualization, and multi-point calibration with polynomial interpolation (2nd–4th order). Unlike linear interpolation used in legacy systems, polynomial fitting improves accuracy by >11× for non-linear calibration curves common in GF-AAS. Data files are stored in vendor-neutral formats (.csv, .txt) and support direct import into LIMS platforms. Raw absorbance vs. time traces, peak area integration, and background-corrected signals are archived with full metadata—including furnace temperature profile, gas flow rates, and lamp identification—ensuring full traceability per ISO/IEC 17025 requirements.

Applications

• Environmental: Quantification of heavy metals in drinking water, wastewater, and sediment extracts per EPA regulatory thresholds.
• Clinical & Forensic: Trace element profiling in blood, urine, and hair for exposure assessment and toxicological screening.
• Pharmaceutical: Residual catalyst (Pd, Pt, Rh) and elemental impurity (Cd, Pb, As) testing aligned with ICH Q3D guidelines.
• Food Safety: Monitoring of toxic elements (e.g., inorganic As in rice, Cd in cocoa) against EU Commission Regulation (EC) No 1881/2006.
• Materials Science: Analysis of dopants and contaminants in semiconductor-grade reagents and battery electrolytes.

FAQ

Is the AA240Z compatible with hydride generation techniques?
Yes—via optional VGA adapter integration, enabling dual-technique verification (e.g., HG-AAS for As/Se/Sb alongside GF-AAS) to confirm speciation-independent total element recovery.
What level of technical documentation accompanies the refurbished unit?
Each instrument ships with full service history, pre-delivery performance verification report (including LOD/LOQ validation per element), and original Agilent operation manuals in English.
Can the software be upgraded to current Agilent release versions?
Yes—refurbished units include eligibility for Agilent’s licensed software update path, subject to valid support contract and OS compatibility (Windows 10/11 64-bit).
Does the 6-month warranty cover consumables such as graphite tubes and lamps?
No—the warranty covers defects in materials and workmanship of core electronics, optics, and furnace mechanisms; consumables are excluded per standard industry practice.
Is remote diagnostics supported?
Yes—when connected to a secure LAN, the system supports Agilent Remote Assist for troubleshooting, firmware updates, and method transfer under IT-administered firewall policies.