Metash TOC-5000 RN Total Organic Carbon Analyzer

Overview

The Metash TOC-5000 RN is a laboratory-grade total organic carbon (TOC) analyzer engineered for precision, regulatory compliance, and operational robustness in environmental, pharmaceutical, and municipal water quality laboratories. It quantifies organic carbon content in aqueous samples via high-temperature catalytic combustion oxidation followed by non-dispersive infrared (NDIR) detection of evolved CO₂. This dual-stage methodology—comprising complete thermal mineralization of organic compounds at up to 900 °C and selective, interference-free CO₂ quantification—ensures high recovery rates (>95% for standard sucrose and 1,4-benzoquinone), minimal matrix effects, and reliable differentiation between total carbon (TC), inorganic carbon (IC), and TOC (calculated as TC − IC or measured directly via NPOC mode).

Key Features

• High-Temperature Catalytic Oxidation System: Equipped with a dual-catalyst furnace (Pt/Al₂O₃ and CeO₂-based options) operating at 680–900 °C, enabling complete oxidation of recalcitrant organics—including humic substances, surfactants, and halogenated compounds—even in high-salinity or high-TDS matrices.
• Triple-Stage Water Vapor Management: Integrates an electronic Peltier cooler, replaceable hydrophobic membrane filter, and imported desiccant dryer to selectively remove H₂O vapor without CO₂ loss—critical for maintaining NDIR signal integrity and minimizing baseline drift across extended run sequences.
• Optimized NDIR Detection Module: Features a thermally stabilized IR source, highly polished gold-coated gas cell, and low-noise pyroelectric detector. Precision temperature compensation (±0.1 °C) eliminates ambient thermal drift; optical path length and cell volume are calibrated per measurement range to maximize sensitivity and linearity.
• Automated Fluid Handling Platform: Utilizes a multi-position rotary valve and syringe-driven metering pump for sub-µL precision in acid addition, sparging, dilution (up to 100×), and post-run system cleaning—reducing manual intervention and ensuring consistent method execution across batches.
• Modular Diagnostic Architecture: Each subsystem (oxidation furnace, NDIR detector, fluidics, gas flow control) operates under independent firmware with real-time status reporting, fault logging, and self-diagnostic routines—facilitating rapid troubleshooting and minimizing instrument downtime.

Sample Compatibility & Compliance

The TOC-5000 RN is validated for use with drinking water, wastewater effluents, surface water, groundwater, ultrapure water (UPW), and pharmaceutical process water (PW/WFI). It supports ASTM D7573–22, ISO 8245:1999, USP , and EP 2.2.44 methodologies. Its hardware and software architecture comply with FDA 21 CFR Part 11 requirements for electronic records and signatures, including role-based user access control, immutable audit trails, electronic signature capture, and full event logging (e.g., parameter changes, calibration actions, error states). All data are stored in a relational SQLite database with automatic backup and export to CSV/PDF formats compliant with GLP/GMP documentation standards.

Software & Data Management

Metash TOC Control Suite is a Windows-native application providing end-to-end workflow management—from method setup and sequence definition to real-time monitoring, QC charting (Levey-Jennings, Shewhart), and automated report generation. The software enforces method-defined acceptance criteria (e.g., % recovery, RSD thresholds) and flags out-of-spec results with contextual annotations. Audit trail entries record timestamped user ID, action type, original value, new value, and IP address (if networked). Diluent and waste bottle level sensors trigger configurable alerts before capacity limits are reached, preventing overflow-related contamination or system shutdowns.

Applications

• Regulatory compliance testing for EPA Method 415.3 and ISO 20674 in municipal and industrial wastewater treatment plants.
• Pharmaceutical water system validation per USP and EU Annex 1, including routine monitoring of PW, WFI, and pure steam condensate.
• Environmental fate studies requiring precise TOC tracking in leachate, landfill runoff, and remediation site groundwater.
• Research applications involving carbon flux analysis in aquatic ecosystems, biodegradability assessments (e.g., OECD 301 series), and catalyst performance evaluation under variable salinity conditions.
• Quality control of reagent-grade water used in semiconductor wet processing and analytical chemistry laboratories.

FAQ

What sample types can the TOC-5000 RN analyze?
Aqueous liquid samples only—including potable water, wastewater, seawater (with appropriate dilution and catalyst selection), ultrapure water, and pharmaceutical process water. Suspensions, oils, or viscous solvents require pretreatment or are outside specification.

Does the instrument support both TC/IC/TOC and NPOC measurement modes?
Yes. It performs direct TC and IC injection, calculates TOC (TC − IC), and executes NPOC mode via automated acidification, sparging, and combustion—fully programmable within a single sequence.

How is data integrity ensured for regulated environments?
Through built-in 21 CFR Part 11 compliance: electronic signatures, time-stamped audit trails, role-based permissions, and encrypted database storage with tamper-evident logging—all validated during IQ/OQ/PQ protocols.

What maintenance intervals are recommended for the oxidation catalyst and NDIR detector?
Catalyst lifetime exceeds 10,000 injections under typical use; replacement is triggered by declining recovery (<90%) or increased carryover. The NDIR optical path requires no routine calibration but benefits from annual verification using certified CO₂ standards.

Can the TOC-5000 RN integrate with LIMS or enterprise networks?
Yes. It supports OPC UA and ASTM E1384-compliant data export, enabling seamless bidirectional communication with major LIMS platforms and centralized lab informatics systems.