Varian AA240Z Zeeman Graphite Furnace Atomic Absorption Spectrometer (Refurbished)

Overview

The Varian AA240Z is a high-performance, refurbished Zeeman graphite furnace atomic absorption spectrometer engineered for ultra-trace elemental analysis in demanding laboratory environments. Based on AC-modulated Zeeman-effect background correction, the system employs a dynamically controlled magnetic field (0.1–0.8 T) locked during measurement to minimize drift from power supply fluctuations and ensure stable baseline integrity. Unlike conventional deuterium or continuum-source background correction methods, the Zeeman approach provides true spectral-line background subtraction at the atomic absorption line position—enabling sub-pg detection limits for elements such as Cd, Pb, As, and Se in complex matrices including biological fluids, environmental digests, and food extracts. The instrument integrates a fixed 4-lamp turret, optimized for rapid lamp selection without mechanical repositioning delays, and features a robust optical path with thermally stabilized monochromator and low-noise photomultiplier detection.

Key Features

• Zeeman-effect background correction with computer-adjustable magnetic field strength (0.1–0.8 T), maintained constant throughout atomization for enhanced reproducibility
• GTA 120 graphite furnace atomizer with integrated temperature control, ramp-and-hold programming, and real-time thermal monitoring
• PSD 120 autosampler supporting up to 120 sample positions, programmable syringe volume (1–100 µL), and optional matrix modifier addition
• UltrAA high-intensity hollow cathode lamps delivering improved signal-to-noise ratios for sub-pg detection capability
• SpectrAA software suite with method development wizards—including SRM (Stepwise Ramp Method) and Tube-Cam—for automated optimization of drying, ashing, atomization, and cleaning steps
• Comprehensive diagnostics and audit trail functionality compliant with GLP/GMP documentation requirements

Sample Compatibility & Compliance

The AA240Z accommodates liquid samples (aqueous, acidic digests, organic extracts) and supports solid sampling via slurry introduction when paired with appropriate furnace modifications. Its Zeeman architecture delivers superior tolerance to spectral and non-spectral interferences common in high-salt or high-matrix samples (e.g., seawater, serum, soil leachates). The system is routinely validated against ASTM D396, EPA Method 200.9, and ISO 11885 for trace metal quantification. All refurbished units undergo full functional verification per ISO/IEC 17025-aligned procedures, including wavelength accuracy, photometric linearity, precision (RSD < 2% for 10 replicate injections), and detection limit confirmation using NIST SRM 1643e (trace elements in water).

Software & Data Management

SpectrAA v5.x provides intuitive workflow-driven operation, with embedded method templates aligned with USP , FDA 21 CFR Part 11 (electronic signature and audit trail modules available), and EU Annex 11 requirements. Raw data files are stored in proprietary .SAA format with embedded metadata (lamp ID, furnace program, calibration curve parameters, operator ID, timestamp). Export options include CSV, XML, and PDF reports with customizable headers, statistical summaries, and QC flagging (e.g., absorbance peak shape deviation, baseline noise threshold exceedance). Secure user access levels (Administrator, Analyst, Reviewer) support role-based permissions and electronic signature enforcement.

Applications

• Environmental testing: Pb, Cd, As quantification in wastewater, sediment, and airborne particulate filters per EPA 200.8/200.9
• Clinical toxicology: Trace element profiling (e.g., blood Cd, urinary Al) under CLIA-certified workflows
• Pharmaceutical quality control: Catalyst residue screening (Pd, Pt, Ni) in active pharmaceutical ingredients (APIs)
• Food safety: Total As speciation preparation (via hydride generation coupling), Cr(VI) in beverages
• Geochemical research: Rare earth element (REE) analysis in acid-digested rock samples

FAQ

Is this unit factory-refurbished or third-party refurbished?
This AA240Z has been comprehensively refurbished by SpectraLab Scientific’s certified service engineers following Varian OEM technical bulletins and calibration protocols.
Does the 6-month warranty cover parts and labor?
Yes—the warranty includes all components, labor, and on-site service calls within North America and EU member states.
Can the system be upgraded to support hydride generation?
Yes—VGA-77 vapor generation accessory integration is supported via standard GTA 120 interface; method templates for As, Sb, Bi, Se, and Hg are pre-loaded in SpectrAA.
Are NIST-traceable calibration standards included?
A full set of Varian-certified calibration standards (1000 mg/L multi-element stock solutions, traceable to NIST SRMs) is provided with each instrument shipment.
What documentation accompanies the instrument?
Each unit ships with refurbished certificate, full service history log, IQ/OQ documentation package, and SpectrAA software license key.