AA-7001 Flame/Graphite Furnace Atomic Absorption Spectrophotometer
| Brand | East & West Analytical Instruments |
|---|---|
| Origin | Beijing, China |
| Manufacturer Type | Direct Manufacturer |
| Instrument Type | Dual-Mode Flame/GF-AAS |
| Monochromator | Plane Grating (1800 lines/mm) |
| Detector | Photomultiplier Tube (PMT) |
| Background Correction | D₂ Lamp + Self-Reversal Full-Wavelength Correction |
| Resolution | ≤0.2 nm |
| Sensitivity | 0.0044 µg/mL for Cu (Abs = 1) |
| Detection Limit | 0.001 µg/mL for Cu (3σ) |
| Precision (RSD) | ≤0.5% (n=10) |
| Atomization Modes | Flame + Electrothermal Graphite Furnace |
| Auto-Switch Time | <2 s between modes |
| Safety Systems | Integrated gas pressure monitoring, flame failure detection, graphite furnace overtemperature cutoff, hollow cathode lamp current regulation, and argon flow supervision |
Overview
The AA-7001 Flame/Graphite Furnace Atomic Absorption Spectrophotometer is a dual-mode analytical instrument engineered for trace elemental quantification in environmental, food safety, pharmaceutical, and metallurgical laboratories. It operates on the fundamental principle of atomic absorption spectroscopy (AAS), where ground-state free atoms in a gaseous state absorb characteristic radiation emitted by a hollow cathode lamp (HCL) or electrodeless discharge lamp (EDL). The AA-7001 integrates flame atomization (FAAS) and electrothermal graphite furnace atomization (GFAAS) within a single, compact optical-mechanical architecture — eliminating inter-system alignment drift and reducing footprint without compromising optical path stability. Its suspended optical bench design isolates the monochromator and detector from mechanical vibration and ambient thermal fluctuation, ensuring long-term baseline integrity and measurement reproducibility across multi-hour analytical sequences.
Key Features
- Monolithic dual-atomizer integration: Flame burner head and graphite furnace chamber co-located within the same instrument housing, enabling sub-2-second mode switching with automated optical realignment.
- Ultra-stable optical platform: Independently suspended monochromator assembly with plane grating (1800 lines/mm), delivering high spectral energy throughput and resolution ≤0.2 nm at 279.5 nm (Mg line).
- Corrosion-resistant titanium nebulization system: Investment-cast Grade 1 titanium雾化室 (nebulizer chamber) and burner head, certified to ASTM B265 for biocompatibility and ISO 10993-5 cytotoxicity — ideal for aggressive matrices including concentrated acids and saline extracts.
- Dual background correction: Simultaneous D₂-lamp continuum correction and self-reversal (SR) full-wavelength correction, validated per ASTM E1718–22 for high-background samples such as soy sauce, seawater digests, and biological tissue homogenates.
- Intelligent graphite furnace control: Programmable 20-step temperature ramping with real-time resistance monitoring; compatible with standard pyrolytic graphite tubes (PGT) rated for continuous operation up to 2600 °C.
- Comprehensive safety architecture: Redundant monitoring of acetylene/O₂ pressure differentials, flame ionization sensing, graphite furnace argon purge flow verification, and HCL current limiting per IEC 61010-1 Ed.3.
Sample Compatibility & Compliance
The AA-7001 accommodates liquid samples ranging from ultrapure water standards (e.g., NIST SRM 1643e) to complex, high-dissolved-solid matrices (up to 25% w/v total solids after dilution/digestion). It supports direct analysis of acid-digested soils (EPA Method 3050B), microwave-digested food composites (AOAC 999.10), and filtered wastewater (ISO 11885). All operational firmware and data handling modules comply with GLP requirements, including electronic signature support, audit trail logging (per 21 CFR Part 11 Annex 11), and method validation templates aligned with ISO/IEC 17025:2017 clause 7.2.2.
Software & Data Management
Control and data acquisition are managed via EW-ASW v4.2 software, a Windows-based platform featuring intuitive method wizard workflows, automatic calibration curve generation (linear, quadratic, and weighted least-squares), and QC flagging per USP . Raw absorbance/time profiles, peak area integration, and background-subtracted net absorbance values are stored in vendor-neutral .CSV and .XML formats. Audit trails record user ID, timestamp, parameter changes, and instrument status events with SHA-256 hashing. Optional LIMS integration is supported via ASTM E1467-compliant HL7 messaging.
Applications
- Environmental monitoring: Quantification of Pb, Cd, Cr, and As in drinking water (EPA 200.9), sediments (EPA 6010D), and airborne particulate filters (NIOSH 7300).
- Food and beverage safety: Multi-element screening in infant formula (ISO 17272), seafood (AOAC 2013.06), and fortified cereals (EN 15510).
- Pharmaceutical quality control: Residual catalyst metals (Pd, Pt, Ni) in active pharmaceutical ingredients per ICH Q2(R2) and USP .
- Clinical and toxicology labs: Blood lead testing (CLIA-waived protocols), urinary cadmium (ISO 15196), and hair mercury analysis (EPA 1631E).
FAQ
Does the AA-7001 support hydride generation for arsenic and selenium analysis?
Yes — it is fully compatible with the HG-01 ceramic-tube hydride generation system, enabling sub-ppt detection limits for As, Se, Sb, Bi, Te, and Hg in aqueous matrices per EPA Method 1630.
Can the instrument be operated in compliance with 21 CFR Part 11?
Yes — EW-ASW v4.2 includes role-based access control, electronic signatures, and immutable audit trails meeting FDA requirements for regulated environments.
What graphite furnace accessories are certified for use with the AA-7001?
Certified consumables include AS-01 autosampler with 80-position sample tray, PGT tubes with integrated platforms (Cat. No. GF-TUBE-PYR-20), and Zeeman-effect background corrector upgrade kit (optional).
Is method transfer possible from other AAS platforms?
Yes — wavelength, slit width, lamp current, and furnace temperature programs can be imported/exported via standardized XML templates compliant with ASTM E2554.
