Online Instrument OL2080 Fully Automated Hexavalent Chromium Analyzer

Overview

The Online Instrument OL2080 Fully Automated Hexavalent Chromium Analyzer is an integrated, closed-system laboratory analyzer engineered for precise, reproducible quantification of Cr(VI) in aqueous environmental matrices. It operates on the principle of spectrophotometric detection following post-column derivatization with 1,5-diphenylcarbazide under controlled acidic conditions — a method validated per EPA Method 7196A and aligned with ISO 11087 for chromium speciation in water. Unlike manual or semi-automated approaches, the OL2080 eliminates operator-dependent variability by executing the entire analytical sequence—from sample aspiration to final report generation—without human intervention. Its sealed fluidic architecture ensures operator safety during handling of toxic reagents (e.g., concentrated sulfuric acid, diphenylcarbazide solutions), while maintaining strict containment of hazardous vapors and aerosols throughout analysis.

Key Features

• Fully walk-away automation: Integrated robotic liquid handling enables autonomous sample transfer, reagent addition (including acidification and chromogenic reagent), interference masking (e.g., Fe³⁺, Cu²⁺), standard curve preparation via serial dilution, homogenization, volumetric finalization, and optical measurement at 540 nm.
• Dual-range calibration management: Stores multiple pre-validated calibration curves (low-range: 0.5–50 µg/L; high-range: 10–500 µg/L) with automatic range-switching logic based on preliminary screening absorbance values.
• Dynamic dilution capability: Detects out-of-range signals in real time and initiates programmable auto-dilution using certified diluent, ensuring traceability and minimizing manual reanalysis.
• Onboard quality control: Supports scheduled blank runs, duplicate injections, and spike recovery checks (e.g., Cr(VI) CRM additions) with pass/fail evaluation against user-defined acceptance criteria (e.g., ±10% recovery).
• Robust fluidic design: Corrosion-resistant PTFE and PFA tubing, chemically inert syringe pumps, and pressure-sensing valves ensure long-term reliability when processing aggressive reagents and complex wastewater matrices.

Sample Compatibility & Compliance

The OL2080 is validated for use with potable water (municipal supply, bottled water), raw source waters (surface and groundwater), secondary distribution systems, and industrial effluents containing suspended solids ≤ 50 mg/L and turbidity ≤ 10 NTU. Sample pretreatment (e.g., filtration through 0.45-µm membrane filters) is required prior to loading. The system supports regulatory alignment with ISO/IEC 17025:2017 requirements for method validation, including documented linearity (R² ≥ 0.999 over defined ranges), limit of detection (LOD ≤ 0.2 µg/L), repeatability (RSD ≤ 3.5%), and intermediate precision. Instrument logs retain full audit trails compliant with GLP and GMP data integrity expectations, including timestamps, operator IDs, method versions, and raw absorbance data.

Software & Data Management

The embedded Windows-based control software provides intuitive menu-driven navigation, role-based access control (administrator, analyst, reviewer), and configurable reporting templates (PDF/CSV). All analytical events—including reagent lot tracking, calibration history, maintenance logs, and error diagnostics—are timestamped and stored locally with optional network backup. Electronic signatures, audit trail review functionality, and exportable raw data files meet foundational requirements for FDA 21 CFR Part 11 readiness. Software updates are delivered via secure USB import with version-controlled firmware verification.

Applications

• Regulatory monitoring of drinking water per WHO Guidelines and national standards (e.g., China’s GB 5749–2022, EU Directive 98/83/EC).
• Compliance testing of industrial discharge permits under local environmental protection bureau mandates.
• Research-grade speciation studies requiring high-throughput Cr(VI) screening across large sample sets (e.g., watershed surveys, landfill leachate characterization).
• Quality assurance in electroplating, leather tanning, and pigment manufacturing facilities where Cr(VI) process control is critical.
• Third-party laboratory accreditation support for ISO/IEC 17025 scope expansion in inorganic contaminants testing.

FAQ

What sample volume is required for a single analysis?
Typical sample consumption is 10–25 mL, depending on selected range and dilution factor.
Does the OL2080 require external nitrogen or compressed air?
No — all fluidic actuation is performed by integrated peristaltic and syringe pumps; no auxiliary gas supply is needed.
Can the instrument be integrated into a LIMS environment?
Yes — it supports ASTM E1384-compliant data export protocols and can transmit results via FTP or direct database push (ODBC-compatible) upon configuration.
How often must the optical cell be cleaned or replaced?
The quartz flow cell is self-cleaning after each run; routine inspection is recommended every 200 analyses, with replacement typically required after ≥2,000 cycles under normal usage.
Is method validation documentation included with the system?
Yes — a comprehensive IQ/OQ protocol package, along with application notes for EPA 7196A and GB/T 5750.6–2023 adaptation, is provided pre-installed and on physical media.