Desktop COD Digestion Reactor (Dual Block)
Dual-block COD digestion reactor with 16-vial capacity and ±0.1°C temperature accuracy for EPA-compliant chemical oxygen demand analysis.
Louise Corscadden, PhD
Director of Science · ConductScience
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Key Specifications
Full details →- Temperature Accuracy
- +/-0.1 C
- Sample Capacity
- 16 vials
- Reaction Time
- 0-120 minutes (adjustable)
- Heat Blocks
- Dual (independent control)
- Control Interface
- Touchscreen + physical keys
- Automation Level
- Semi-automated
The Desktop COD Digestion Reactor (Dual Block) provides precise temperature control for Chemical Oxygen Demand analysis using standard EPA and ISO methodologies. This dual-block system accommodates 16 sample vials with independent temperature control for each block, enabling simultaneous processing of different sample types or duplicate analyses. The reactor maintains temperature accuracy of ±0.1°C across the full range of 45-180°C, essential for reproducible dichromate digestion protocols.
The touchscreen interface with physical key backup provides reliable operation control, while the adjustable reaction time (0-120 minutes) accommodates various COD determination protocols including EPA Method 410.4 and Standard Methods 5220D. The compact desktop design (359 × 195 × 167 mm) fits standard laboratory benchtops while providing the thermal stability required for quantitative organic matter determination in water and wastewater samples.
How It Works
Chemical Oxygen Demand (COD) determination relies on the oxidation of organic compounds by dichromate ion (Cr2O7²⁻) under acidic conditions at elevated temperature. The reactor provides controlled heating to facilitate complete oxidation reactions between organic matter in the sample and the dichromate reagent in sealed vials. During digestion, organic compounds are oxidized while dichromate is reduced to chromic ion (Cr³⁺), producing a measurable color change proportional to the oxygen-demanding substances present.
The dual-block design allows independent temperature control for each 8-vial block, enabling simultaneous processing of samples requiring different digestion conditions or running duplicates with standards. The precise temperature control (±0.1°C) ensures consistent reaction kinetics essential for quantitative results, while the adjustable timing accommodates both rapid screening protocols and extended digestion procedures.
Heat distribution through the aluminum blocks provides uniform temperature across all vial positions, eliminating thermal gradients that could cause variable digestion efficiency. The integrated cooling system allows controlled temperature ramping and maintains stable conditions throughout the reaction period.
Features & Benefits
Research record
Use these values in methods sections and data records.
- Device type
- Heating block
OBI:0400108
This ID comes from the Ontology for Biomedical Investigations (OBI).
Download the source data for this record as a JSON-LD file
Methods section wording
heating block (ConductScience, Skokie, IL, USA; cat. no. LH-WQ-0008)
Temperature Accuracy
- +/-0.1 C
Sample Capacity
- 16 vials
Reaction Time
- 0-120 minutes (adjustable)
Heat Blocks
- Dual (independent control)
Control Interface
- Touchscreen + physical keys
Automation Level
- semi-automated
Brand
- ConductScience
Temperature Range
- 45-180 C
Power/Voltage
- DC 24V / 12.5A
Research Domain
- Analytical Chemistry
- Environmental Monitoring
- Food Science
- Industrial Hygiene
- Materials Science
- Pharmaceutical QC
Shipping weight
- 4.0 lb
Shipping box
- L: 359.0 cm
- W: 195.0 cm
- H: 167.0 cm
| Feature | This Product | Typical Alternative | Advantage |
|---|---|---|---|
| Temperature Accuracy | ±0.1°C across 45-180°C range | Entry-level models commonly offer lower precision | Ensures reproducible digestion kinetics essential for quantitative analytical results. |
| Heating Block Design | Dual independent blocks with 8 vials each | Single block configurations limit operational flexibility | Allows simultaneous processing of different sample types or duplicate analytical runs. |
| Temperature Range | 45-180°C operational range | Basic models may have more limited temperature spans | Accommodates all standard COD protocols from gentle digestion to high-temperature applications. |
| User Interface | Touchscreen with physical key backup | Simple digital displays with basic controls | Provides intuitive operation with redundant control options for reliable performance. |
| Sample Capacity | 16 total vial positions | Smaller units typically handle fewer samples per batch | Increases analytical throughput for routine COD monitoring and quality control work. |
The reactor combines precise temperature control with dual-block flexibility for enhanced COD analytical capability. The ±0.1°C accuracy and 16-vial capacity provide the performance and throughput required for routine environmental and quality control applications.
Practical Tips
Verify temperature accuracy monthly using a certified thermometer placed in empty vial positions across both blocks.
Why: Temperature drift can compromise digestion efficiency and analytical reproducibility over time.
Clean aluminum blocks weekly with mild detergent to remove any reagent residue or sample spillage.
Why: Contamination buildup can cause uneven heating and affect temperature control performance.
Allow 10-15 minutes for thermal equilibration before starting digestion cycles, especially when changing temperatures.
Why: Thermal equilibrium ensures uniform starting conditions across all vial positions.
Always use appropriate fume extraction when processing COD vials containing dichromate reagents.
Why: Dichromate vapors pose health risks and require proper ventilation for safe laboratory operation.
Process blanks and standards with each batch using identical time and temperature conditions.
Why: Quality control samples ensure analytical accuracy and detect potential contamination or reagent issues.
Check vial seating if temperature readings appear inconsistent between positions within the same block.
Why: Poor thermal contact between vials and aluminum blocks can cause temperature measurement errors.
Document temperature and timing settings for each analytical method to ensure protocol consistency.
Why: Standardized conditions are essential for method validation and interlaboratory comparisons.
Setup Guide
What’s in the Box
- Desktop COD Digestion Reactor main unit
- DC 24V / 12.5A power adapter
- User manual and operation guide
- Quick reference protocol card (typical)
- Temperature verification instructions (typical)
Warranty
ConductScience provides a one-year manufacturer warranty covering defects in materials and workmanship, with technical support for method optimization and troubleshooting.
Compliance
References
Background reading relevant to this product:
What temperature accuracy is achieved across the full operating range?
The system maintains ±0.1°C accuracy from 45-180°C, verified through calibrated temperature sensors in each heating block.
Can the two blocks operate at different temperatures simultaneously?
Yes, each 8-vial block has independent temperature control, allowing simultaneous processing at different conditions or duplicate runs.
What vial sizes are compatible with the heating blocks?
The aluminum blocks accommodate standard COD digestion vials used in EPA and ISO methods, with 16 total positions across both blocks.
How is temperature uniformity maintained across vial positions?
Precision-machined aluminum blocks provide thermal conductivity for uniform heat distribution, eliminating temperature gradients between positions.
What power requirements are needed for installation?
The unit requires DC 24V at 12.5A supplied through the included power adapter connected to standard laboratory AC power.
Can reaction timing be programmed for unattended operation?
Yes, the adjustable timer (0-120 minutes) allows programmed digestion cycles with automatic completion indication.
How does the touchscreen interface compare to physical controls?
The touchscreen provides digital temperature and timing display with menu navigation, while physical keys offer backup control for critical operations.
What cooling method is used after digestion completion?
The system includes controlled cooling to safely reduce sample temperature while maintaining vial integrity after digestion cycle completion.
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