Brooks Rand MERX-T Total Mercury Analyzer
| Brand | Brooks Rand Lab |
|---|---|
| Origin | Imported |
| Model | MERX-T |
| Instrument Type | Portable |
| Measurement Principle | Cold Vapor Atomic Fluorescence Spectrometry (CVAFS) |
| Detection Limit | 0.03 ng/L |
| Precision | RSD ≤ 3% at 500 pg |
| Linear Range | 0.2–400 ng/L |
| Sample Throughput | Up to 72 samples per run |
| Analysis Time per Sample (EPA Method 1631) | 4.5 minutes |
| Sample Introduction | Pump-free, liquid-free headspace injection (max. 25 mL) |
| Detector | High-Sensitivity CVAFS with Touchscreen Control Interface |
Overview
The Brooks Rand MERX-T Total Mercury Analyzer is a fully automated, portable benchtop system engineered for ultra-trace quantification of total mercury in aqueous, biological, and environmental matrices. It operates on the principle of Cold Vapor Atomic Fluorescence Spectrometry (CVAFS), a technique recognized for its exceptional sensitivity, selectivity, and low interference in complex sample backgrounds. The MERX-T implements EPA Method 1631 — the U.S. Environmental Protection Agency’s validated standard for total mercury analysis in water — and is widely deployed in regulatory laboratories, environmental monitoring agencies, and research institutions requiring compliance-grade data integrity. Its design emphasizes robustness, operational simplicity, and minimal maintenance, enabling reliable performance under routine high-throughput conditions without compromise to detection fidelity.
Key Features
- Patented pump-free, liquid-free headspace sampling: Eliminates tubing contamination, carryover, and reagent degradation risks while supporting up to 25 mL sample volumes per analysis.
- High-capacity autosampler with 72-position capacity and fully enclosed sample tray, ensuring inert atmosphere preservation and operator safety during unattended operation.
- Dual-channel gold amalgamation trapping module: Enables alternating capture and thermal desorption cycles, reducing inter-sample dead time and preventing peak broadening associated with single-stage trapping.
- Secondary focusing trap: Enhances analyte concentration efficiency prior to CVAFS detection, directly contributing to the instrument’s sub-pg-level sensitivity and reproducibility.
- Integrated CVAFS detector with real-time signal visualization: Features a high-stability UV excitation source, low-noise photomultiplier tube, and temperature-controlled optical path for optimal fluorescence yield and long-term baseline stability.
- Intuitive touchscreen interface with embedded method editor: Allows full control over reduction chemistry timing, trapping/desorption temperatures, gas flow profiles, and calibration sequences without external software dependency.
Sample Compatibility & Compliance
The MERX-T accommodates a broad range of sample types including drinking water, wastewater, seawater, soil leachates, fish tissue digests, and clinical biofluids following standardized acid digestion (e.g., EPA Methods 1631, 245.1, and ASTM D6722). Its hardware architecture and firmware logic are aligned with GLP/GMP data integrity requirements, supporting audit-ready electronic records, user-access controls, and method versioning. While the system itself does not include built-in 21 CFR Part 11 compliance modules, it generates raw data files compatible with third-party LIMS and validated data management platforms used in regulated environments.
Software & Data Management
Data acquisition and processing are managed via the onboard MERX Control Software, which provides real-time chromatogram display, peak integration with manual override capability, calibration curve generation (linear and quadratic), and automatic QC flagging based on user-defined acceptance criteria (e.g., %RSD, recovery limits). All analytical parameters, raw spectra, integration logs, and audit trails are timestamped and stored in non-proprietary ASCII formats for seamless export to laboratory information systems. Firmware updates are delivered through secure USB-based protocols, ensuring traceable revision history and backward compatibility across method libraries.
Applications
- Regulatory compliance testing for total mercury in surface water and effluent streams per EPA Clean Water Act mandates.
- Monitoring mercury contamination in drinking water distribution systems and groundwater remediation sites.
- Supporting ecological risk assessments through ultra-low-level mercury quantification in marine biota and sediment pore waters.
- Method validation and reference material certification in national metrology institutes and proficiency testing providers.
- Research applications involving mercury speciation workflow integration — the MERX-T serves as the total mercury quantification anchor in tandem with HPLC-CVAFS or GC-ICP-MS coupling strategies.
FAQ
Does the MERX-T require daily calibration?
No — the system supports multi-point calibration verification at user-defined intervals; typical laboratory practice employs bracketing calibrations every 10–12 samples, with ongoing drift correction enabled via internal standard addition or system suitability checks.
Can the MERX-T be integrated with an external digestion system?
Yes — it accepts pre-digested samples in standard 40-mL VOA vials and supports custom autosampler tray configurations for direct interfacing with robotic digestion workstations.
Is the dual-channel trapping module field-replaceable?
Yes — both gold traps are modular components with documented replacement procedures and lifetime tracking via firmware logging.
What gases are required for operation?
Ultra-high-purity argon (99.999%) is recommended as the carrier and purge gas; no additional reactive gases (e.g., oxygen, hydrogen) are needed for total mercury analysis.
How is data security handled during remote diagnostics?
Remote support sessions are initiated only upon explicit user authorization and operate over encrypted TLS tunnels; no data extraction or persistent remote access is permitted without written protocol approval.
