Brookfield RGF-7700 Used Multi-Channel Atomic Fluorescence Spectrometer

Overview

The Brookfield RGF-7700 is a pre-owned, multi-channel atomic fluorescence spectrometer engineered for trace elemental analysis in environmental, pharmaceutical, food safety, and geochemical laboratories. It operates on the principle of hydride generation–atomic fluorescence spectroscopy (HG-AFS), where analyte elements—such as arsenic, mercury, selenium, antimony, and bismuth—are chemically reduced to volatile hydride species or cold vapor (e.g., Hg⁰), atomized in a quartz cell under argon shielding, and excited by a high-intensity hollow cathode lamp (HCL) or electrodeless discharge lamp (EDL). The resulting atomic fluorescence emission is collected at right angles to the excitation beam, minimizing background scatter and enabling sub-part-per-trillion detection sensitivity. Designed for robust routine operation, the RGF-7700 integrates dual sequential injection pumping for precise reagent and sample metering, ensuring high reproducibility and low carryover across extended analytical sequences.

Key Features

• Multi-channel configuration supporting simultaneous or sequential determination of up to 12 elements—including As, Hg, Se, Pb, Sb, Bi, Cd, Te, Sn, Ge, Zn, and Au—without hardware reconfiguration.
• Dual sequential injection pump system delivering accurate, pulse-free fluid delivery with programmable timing for optimized hydride generation kinetics and reaction zone control.
• Low-noise photomultiplier tube (PMT) detector with adjustable high-voltage bias and digital signal processing for enhanced signal-to-noise ratio and long-term baseline stability.
• Integrated quartz atomizer with argon gas-shielded flame-in-cell design to minimize oxide formation and maximize atomic cloud density.
• Automated lamp alignment and intensity optimization routines to maintain consistent excitation energy across lamp lifetime.
• Modular optical path with fused-silica lenses and interference filters matched to each element’s characteristic fluorescence wavelength (e.g., 193.7 nm for As, 253.7 nm for Hg).

Sample Compatibility & Compliance

The RGF-7700 accommodates aqueous liquid samples requiring minimal pretreatment—typically acid digestion (HNO₃/HCl) followed by prereduction (e.g., KI/ascorbic acid for As/Sb/Bi or NaBH₄ for Se/Te). Solid matrices (soils, sediments, biological tissues) are compatible following EPA Method 7063 or GB 5009.11–2014 digestion protocols. The instrument meets essential performance criteria outlined in ISO 11929:2019 (evaluation of measurement uncertainty), ASTM D6722–22 (standard test method for total mercury in water by cold vapor AFS), and Chinese national standard GB/T 223.79–2007 (determination of arsenic in iron ores by hydride AFS). Its documented RSD < 0.8% and linear dynamic range exceeding three orders of magnitude support GLP-compliant validation per ICH Q2(R2) guidelines when paired with appropriate system suitability testing.

Software & Data Management

The RGF-7700 runs on proprietary Windows-based acquisition software supporting real-time spectral display, peak integration via Gaussian deconvolution, calibration curve fitting (linear, quadratic, or weighted least squares), and automatic quality control flagging (e.g., drift correction, blank excursion alerts). All analytical sessions generate audit-trail-enabled data files (.afsd) containing timestamps, operator ID, instrument parameters, raw intensity values, and integrated peak areas. Export options include CSV, Excel, and XML formats compliant with LIMS interfaces. While not natively 21 CFR Part 11 certified, the system supports external electronic signature workflows and can be validated for GMP environments using IQ/OQ/PQ protocols aligned with Annex 11 principles.

Applications

• Regulatory monitoring of arsenic and mercury in drinking water (EPA 1631, GB 5749–2022) and wastewater effluents.
• Quantification of selenium and iodine in infant formula and dietary supplements per USP and ChP 2020.
• Speciation-unresolved total metal screening in rice, seafood, and herbal medicines for compliance with EU Commission Regulation (EC) No 1881/2006.
• Geochemical prospecting via rapid field-lab analysis of stream sediments and rock leachates.
• QC/QA in contract testing labs performing ISO/IEC 17025-accredited analyses for environmental and food certification bodies.

FAQ

Is the RGF-7700 suitable for regulatory submissions in the EU or USA?

Yes—when operated within validated methods (e.g., EPA 1631 for Hg, ISO 17294-2 for multi-element water analysis) and supported by full documentation of calibration, QC, and maintenance history.
What consumables require regular replacement?

Quartz atomizers (typical lifetime: 6–12 months under continuous use), hollow cathode lamps (1,000–3,000 mAh rating), sodium borohydride solutions (prepared daily), and high-purity argon gas (99.999%).
Can the system be upgraded with modern data security features?

Hardware-level upgrades are limited; however, network isolation, encrypted backups, and integration with validated third-party LIMS platforms enable alignment with current cybersecurity best practices for lab IT infrastructure.
What verification documentation accompanies a refurbished unit?

Each unit ships with a full refurbishment report including lamp intensity verification, pump flow-rate calibration logs, detection limit verification data (per element), and a certificate of conformance to original factory specifications.
Is technical support available post-purchase?

Yes—through authorized service partners offering remote diagnostics, on-site preventive maintenance contracts, and application-specific method development assistance.