Hach DR1010 Chemical Oxygen Demand (COD) Analyzer

Overview

The Hach DR1010 Chemical Oxygen Demand (COD) Analyzer is a benchtop and field-deployable photometric instrument engineered for precise, compliant, and routine quantification of chemical oxygen demand in water and wastewater samples. It operates on the principle of spectrophotometric detection following colorimetric oxidation—typically using dichromate-based digestion under acidic, high-temperature conditions—where the reduction of Cr⁶⁺ to Cr³⁺ produces a green-colored complex proportional to the organic load. The DR1010 supports both rapid digestion protocols (e.g., 15-min heated digestion per EPA Method 410.4 and China’s HJ/T 399–2007) and the classical 2-hour digestion method, enabling alignment with national regulatory frameworks including Chinese Environmental Protection Standards and U.S. EPA-compliant laboratory practices. Designed for robustness in variable environments, it features dual power capability (AC adapter or four AA alkaline batteries), IP41-rated enclosure, and temperature-stable optical architecture—ensuring reproducibility across lab and field settings.

Key Features

• Dual-wavelength photometry at 420 nm and 610 nm, automatically selected per test method to optimize sensitivity for low- and high-range COD measurements (e.g., 0–150 mg/L and 100–1500 mg/L)
• Pre-programmed, factory-calibrated COD calibration curves compliant with HJ/T 399–2007 and ASTM D1253; supports user-defined curve creation via up to 10-point calibration
• Integrated reagent blank correction and standard adjustment functions to compensate for matrix interference and inter-batch reagent variability
• High-stability LED light source and silicon photodiode detector ensure long-term photometric repeatability (±0.005 A at 0–1 A range) and linearity (±0.002 A)
• Four-digit LCD display with 15-mm character height, supporting simultaneous readout in concentration (mg/L COD), absorbance (A), or transmittance (%)
• Intuitive icon-driven interface with real-time status feedback during digestion and measurement cycles
• RS232 serial interface for direct data transfer to PCs or microprinters; compatible with Hach’s DataCapture™ software for audit-trail-enabled data logging
• Self-diagnostic system with error-code display for rapid troubleshooting of optical, thermal, or electrical faults

Sample Compatibility & Compliance

The DR1010 accommodates standard 16-mm round glass or disposable plastic COD vials (e.g., Hach LCK or TNT vials) and is validated for use with Hach’s certified COD reagents—including high-range (TNT820), low-range (TNT821), and ultra-low-range (TNT822) kits. It meets the performance criteria outlined in China’s HJ/T 399–2007 (“Determination of Chemical Oxygen Demand in Water by Rapid Digestion Spectrophotometry”), aligns with key elements of EPA Method 410.4, and supports GLP-compliant workflows through traceable calibration records and operator ID logging (when paired with optional PC software). Its optical design minimizes stray light effects and drift (<1.0% at 400 nm), ensuring stability across ambient temperatures from 0 to 50 °C and humidity up to 80% at 40 °C.

Software & Data Management

Data generated by the DR1010 can be exported via RS232 to Windows-based systems running Hach’s DataCapture™ or third-party spreadsheet applications. The instrument stores up to 500 test results internally with timestamps, method IDs, and operator notes. When connected to compliant software, full electronic records—including raw absorbance values, calibration history, and reagent lot traceability—can be archived to satisfy 21 CFR Part 11 requirements for audit readiness. All stored data retain method-specific metadata (e.g., digestion time, wavelength, curve ID), facilitating retrospective review and QA/QC validation per ISO/IEC 17025 and CNAS accreditation guidelines.

Applications

• Wastewater treatment plant influent/effluent monitoring and process control
• Environmental monitoring stations conducting routine surface water and groundwater assessments
• Industrial pretreatment compliance verification (e.g., food processing, pharmaceutical, textile sectors)
• Educational laboratories requiring EPA- and China-standard-aligned COD training platforms
• Field-based emergency response testing during spill events or regulatory inspections

FAQ

Does the DR1010 support both rapid and standard 2-hour COD digestion methods?

Yes—the instrument is preconfigured for rapid digestion (15 min at 150 °C) per HJ/T 399–2007 and also supports the traditional 120-minute digestion protocol using compatible Hach reagents and heating blocks.
Can custom calibration curves be saved and recalled for different sample matrices?

Yes—users may store up to five independent multi-point calibration curves, each associated with unique method identifiers and applicable to specific wastewater types or industrial effluents.
Is the DR1010 compliant with FDA 21 CFR Part 11 for electronic records?

The instrument itself does not provide electronic signatures or role-based access control; however, when integrated with validated Hach DataCapture™ software and appropriate IT infrastructure, full Part 11 compliance—including audit trails, electronic signatures, and secure archiving—is achievable.
What is the typical battery life under field-use conditions?

With four fresh AA alkaline batteries and intermittent usage (≤10 tests/day), operational life exceeds six months; battery status is continuously monitored and displayed.
How is optical performance verified during routine operation?

Users may perform daily verification using Hach’s certified absorbance standards (e.g., 0.5 A and 1.0 A filters); the instrument logs verification results and alerts if deviations exceed ±0.005 A tolerance.