COD Analyzer
Benchtop COD analyzer with dual measurement ranges (0-150 mg/L and 0-1500 mg/L) providing ±8% accuracy for chemical oxygen demand determination in water samples.
Louise Corscadden, PhD
Neuroscience · ConductScience
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The COD Analyzer is a laboratory instrument designed for chemical oxygen demand (COD) measurement in water samples. Available in two configurations (COD-100 and COD-100R), the system provides quantitative analysis of organic pollutant levels through standardized chemical oxidation methods. The analyzer features dual measurement ranges of 0-150 mg/L and 0-1500 mg/L to accommodate different sample concentrations and testing requirements.
The instrument delivers measurement accuracy of ±8% with repeatability of ≤3%, suitable for routine water quality monitoring and environmental analysis. With a compact benchtop design and AC power operation, the analyzer integrates into existing laboratory workflows for COD determination in wastewater treatment, environmental monitoring, and industrial discharge assessment applications.
How It Works
Chemical oxygen demand (COD) analysis measures the amount of oxygen required to chemically oxidize organic compounds in water samples. The COD analyzer employs a standardized dichromate oxidation method where potassium dichromate serves as the oxidizing agent under acidic conditions at elevated temperature. Organic compounds in the sample are oxidized by the dichromate, with the degree of oxidation proportional to the organic content.
The instrument measures the reduction in dichromate concentration spectrophotometrically, as the dichromate ion exhibits characteristic absorption in the visible spectrum. The difference between the initial dichromate concentration and the residual concentration after oxidation corresponds to the oxygen equivalent consumed by the organic matter in the sample.
Temperature control and reaction time standardization ensure reproducible oxidation conditions. The dual-range capability (0-150 mg/L and 0-1500 mg/L) accommodates samples with varying organic loads through appropriate dilution or direct measurement protocols.
Features & Benefits
Automation Level
- semi-automated
Range
- (0~150)mg/L, (0~1500)mg/L
Repeatability
- ≤3%
Fluctuation
- 6mg/L(20min)
External Size
- COD-100: 315*225*100mm; COD-100R: 330*228*132mm
Package Size
- COD-100: 370*305*330mm; COD-100R: 575*435*285mm
Brand
- ConductScience
Research Domain
- Analytical Chemistry
- Environmental Monitoring
- Industrial Hygiene
- Pharmaceutical QC
- Water Quality & Environmental
Accuracy
- ±8%
Power/Voltage
- AC220V, 50/60Hz
Weight
- 4kg; 5.5kg
Weight
- 2.0 kg
Dimensions
- L: 10.0 mm
- W: 31.5 mm
- H: 22.5 mm
| Feature | This Product | Typical Alternative | Advantage |
|---|---|---|---|
| Measurement Ranges | Dual ranges: 0-150 mg/L and 0-1500 mg/L | Single-range models often require sample dilution for high-concentration samples | Eliminates dilution steps and associated measurement errors when analyzing samples across wide concentration ranges. |
| Measurement Accuracy | ±8% accuracy with ≤3% repeatability | Entry-level analyzers may offer ±10-15% accuracy | Higher precision supports regulatory compliance and quality control applications requiring reliable quantitative data. |
| Baseline Stability | 6 mg/L fluctuation over 20 minutes | Basic models may show higher baseline drift | Maintains consistent performance during extended analysis sessions for batch sample processing. |
| Physical Footprint | Compact 315×225×100mm (COD-100) benchtop design | Larger analyzers may require dedicated bench space | Fits in standard laboratory spaces without extensive bench rearrangement or dedicated instrument areas. |
| Model Configurations | Two models available (COD-100 and COD-100R) | Limited configuration options | Allows laboratories to select appropriate system capacity and features based on specific throughput requirements. |
The COD Analyzer combines dual-range measurement capability with compact benchtop design and reliable analytical performance. The system provides ±8% accuracy across both measurement ranges while maintaining stable baseline performance for routine water quality analysis applications.
Practical Tips
Verify calibration daily using fresh standard solutions prepared from certified reference materials.
Why: Daily verification ensures the ±8% accuracy specification is maintained throughout routine operation.
Clean sample vials thoroughly between different sample types to prevent cross-contamination.
Why: Residual organic matter from previous samples can bias COD measurements and affect analytical precision.
Allow 30-minute warm-up time before analysis to achieve thermal equilibrium and stable baseline.
Why: Thermal stability is critical for consistent spectrophotometric measurements and maintaining repeatability specifications.
Filter turbid samples or use appropriate pretreatment to remove suspended solids that may interfere with measurement.
Why: Suspended particles can scatter light and affect spectrophotometric readings, leading to measurement errors.
Run duplicate analyses for samples with COD levels near regulatory limits or critical decision points.
Why: Duplicate measurements provide statistical confidence in results and help identify potential analytical problems.
If baseline drift exceeds 6 mg/L over 20 minutes, check reagent quality and instrument temperature stability.
Why: Excessive baseline drift indicates potential reagent degradation or thermal instability affecting measurement reliability.
Handle dichromate reagents with appropriate PPE and dispose of waste according to local hazardous waste regulations.
Why: Dichromate compounds are toxic and carcinogenic, requiring proper safety protocols for laboratory personnel protection.
Setup Guide
What’s in the Box
- COD Analyzer main unit
- Power cord (AC220V)
- Sample vials and caps (typical)
- Reagent starter kit (typical)
- User manual and operation guide
- Calibration certificate (typical)
- Warranty documentation
Warranty
ConductScience provides a standard one-year manufacturer warranty covering defects in materials and workmanship. Technical support is available to assist with instrument operation, calibration procedures, and troubleshooting throughout the warranty period.
Compliance
What sample volume is required for each COD measurement?
Consult product datasheet for specific sample volume requirements, which typically depend on the selected measurement range and expected COD concentration.
How long does each analysis cycle take to complete?
Analysis time varies with the oxidation method used; consult the operation manual for specific timing parameters for each measurement range.
Can the analyzer handle high-chloride samples that interfere with dichromate methods?
Standard dichromate COD methods can be affected by high chloride concentrations; consult product specifications for chloride interference limits and sample pretreatment options.
What calibration frequency is recommended for maintaining ±8% accuracy?
Calibration frequency depends on usage intensity and sample matrix; typically daily verification with standards is recommended for routine analytical work.
Is the instrument compatible with automated sample handling systems?
Consult technical specifications to determine compatibility with specific autosampler or automated sample preparation systems.
What data output formats are available for results recording?
Check product documentation for available data export options, which may include digital interfaces or printed results depending on the model configuration.
How does measurement precision compare between the two ranges (0-150 vs 0-1500 mg/L)?
Both ranges maintain ≤3% repeatability specification; absolute precision varies with concentration level within each range according to the ±8% accuracy specification.
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