Chlorine Kit
Field-portable colorimetric test kit for quantitative determination of free chlorine residuals in water samples, designed for laboratory and environmental monitoring applications.
| Product name | Model No. |
| Chlorine kit | LH2004 |
| Automation Level | manual |
| Brand | ConductScience |
The Chlorine Kit (Model LH2004) is a field-portable water analysis system designed for quantitative determination of free chlorine residuals in aqueous solutions. This colorimetric test kit provides researchers and quality control professionals with rapid, on-site chlorine measurement capabilities for water quality assessment protocols.
The kit employs standardized colorimetric methodology for chlorine detection, enabling measurement of free available chlorine concentrations in drinking water, process water, and environmental samples. The system is designed for laboratory and field applications where rapid chlorine residual determination is required for water treatment monitoring and quality control procedures.
How It Works
The Chlorine Kit utilizes colorimetric analysis based on the DPD (N,N-diethyl-p-phenylenediamine) method for free chlorine determination. Free chlorine in the sample reacts with DPD reagent to form a pink-colored complex, with color intensity directly proportional to chlorine concentration following Beer-Lambert law principles.
The measurement process involves adding DPD indicator reagent to a measured water sample, allowing color development, and comparing the resulting color intensity to standardized color charts or using photometric measurement. The reaction occurs rapidly at ambient temperature, enabling immediate field measurements without sample preservation requirements.
The kit components are formulated to minimize interference from common water constituents while maintaining measurement accuracy across typical environmental and process water matrices. Temperature and pH effects are controlled through buffering systems incorporated in the reagent formulation.
Features & Benefits
Product name
- Model No.
Chlorine kit
- LH2004
Automation Level
- manual
Brand
- ConductScience
Research Domain
- Clinical Diagnostics
- Environmental Monitoring
- Food Science
- Industrial Hygiene
- Microbiology
- Pharmaceutical QC
Weight
- 0.26 kg
Dimensions
- L: 30.0 mm
- W: 20.0 mm
- H: 10.0 mm
Comparison Guide
| Feature | This Product | Typical Alternative | Advantage |
|---|---|---|---|
| Detection Method | DPD colorimetric analysis with visual or photometric readout | Electronic sensors often require frequent calibration and maintenance | Colorimetric method provides reliable results without electronic drift or calibration stability concerns. |
| Field Portability | Complete test kit with reagents and materials for on-site analysis | Benchtop analyzers require laboratory facilities and power supply | Enables immediate testing at sampling locations without sample transport or preservation requirements. |
| Operating Cost | Reagent-based system with consumable test materials | Electronic analyzers have higher initial cost but lower per-test expenses | Lower capital investment for periodic testing applications with predictable reagent costs. |
| Sample Matrix Compatibility | DPD method validated for diverse water types | Some electronic methods require specific sample conditioning | Robust performance across drinking water, process water, and environmental samples without extensive sample preparation. |
The Chlorine Kit Model LH2004 provides reliable field-portable chlorine analysis using established DPD colorimetric methodology. The kit offers practical advantages for routine monitoring applications requiring immediate results without laboratory infrastructure or complex instrumentation.
Practical Tips
Prepare fresh chlorine standard solutions using sodium hypochlorite and verify concentration before use as calibration references.
Why: Standard solution stability affects calibration accuracy and measurement traceability.
Clean test vials thoroughly between samples using dilute acid wash followed by distilled water rinse.
Why: Residual chlorine or interfering substances can cause carryover effects and measurement bias.
Collect samples from flowing water when possible and avoid sampling from stagnant areas or dead-end lines.
Why: Chlorine residuals vary with water residence time and contact with pipe materials.
If color development is weak or absent, verify reagent activity using known chlorine standard and check for sample interference.
Why: Weak color indicates reagent degradation, sample interference, or very low chlorine levels requiring method sensitivity verification.
Record environmental conditions including temperature and lighting during color comparison measurements.
Why: Ambient conditions affect visual color assessment and measurement repeatability in field applications.
Handle chlorinated samples with appropriate personal protective equipment and avoid mixing with acids or other chemicals.
Why: Chlorine compounds can release toxic gases when mixed with incompatible chemicals, creating respiratory hazards.
Perform duplicate analyses on 10% of samples and investigate results differing by more than acceptable precision limits.
Why: Duplicate analysis provides quality control assessment and identifies potential procedural errors or sample variability.
Setup Guide
What’s in the Box
- DPD reagent solution (typical)
- Test vials or sample containers (typical)
- Color comparison charts (typical)
- Measuring pipettes or droppers (typical)
- User manual and protocol instructions (typical)
- Quality control reference materials (typical)
Warranty
ConductScience provides standard manufacturer warranty coverage for reagent shelf life and kit component functionality. Technical support is available for method optimization and troubleshooting analytical procedures.
Compliance
References
Background reading relevant to this product:
What is the detection range and sensitivity of the DPD method for free chlorine?
The DPD colorimetric method typically provides detection capabilities suitable for drinking water and process water applications. Consult product datasheet for specific measurement range, detection limit, and precision specifications for this kit formulation.
How long are reagents stable and what storage conditions are required?
Reagent stability depends on storage temperature and container integrity. Store reagents according to label instructions, typically in cool, dry conditions away from direct sunlight. Check expiration dates before use and replace expired reagents.
What interferences affect chlorine measurement accuracy?
Common interferences include high levels of monochloramine, brominated compounds, and certain oxidizing agents. The DPD method is formulated to minimize routine interferences, but complex water matrices may require method validation.
Can this kit distinguish between free chlorine and combined chlorine?
The standard DPD method measures free available chlorine. Total chlorine determination requires additional reagents and modified procedures. Consult product documentation for available measurement options.
What quality control procedures should be implemented?
Include blank samples, duplicate analyses, and reference standard verification in routine testing. Document calibration procedures and maintain records of reagent lot numbers and expiration dates for traceability.
How does sample pH affect measurement accuracy?
The DPD method includes buffering to control pH effects within normal water pH ranges. Extreme pH samples may require neutralization before analysis. Follow kit protocols for pH adjustment procedures.
What is the recommended sample holding time before analysis?
Chlorine residuals are unstable and decrease rapidly in stored samples. Analyze samples immediately after collection when possible, or within manufacturer-specified holding times to maintain measurement accuracy.
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