Ammonia Nitrogen Pack Test
Pre-packaged colorimetric reagent tubes for rapid field determination of ammonia nitrogen concentrations in water samples using the Nessler method.
The Ammonia Nitrogen Pack Test provides rapid, field-portable colorimetric analysis of ammonia nitrogen concentrations in water samples using pre-packaged reagent tubes. This single-use test system employs the established Nessler colorimetric method, delivering quantitative ammonia nitrogen measurements in 3-5 minutes without requiring laboratory infrastructure or specialized training.
Each sealed reagent tube contains standardized Nessler reagent formulation optimized for ammonia nitrogen determination across typical environmental and industrial water matrices. The test procedure involves sample aspiration into the reagent tube, brief mixing, and colorimetric comparison against a calibrated color chart for concentration determination. The aluminum foil-sealed tubes provide 18-month shelf stability under ambient storage conditions.
How It Works
The Ammonia Nitrogen Pack Test utilizes the Nessler colorimetric method, where ammonia in alkaline solution reacts with Nessler's reagent (potassium tetraiodomercurate(II)) to form a yellow to brown colloidal complex. The intensity of the color development is directly proportional to the ammonia nitrogen concentration, following Beer's law principles for spectrophotometric analysis.
Upon sample introduction, free ammonia and ammonium ions present in the water sample react with the pre-loaded Nessler reagent to form the characteristic iodo-mercury complex. The reaction proceeds rapidly at ambient temperature, typically reaching maximum color development within 3-5 minutes. The resulting coloration is compared against a standardized colorimetric chart calibrated to known ammonia nitrogen concentrations.
The sealed tube design eliminates reagent preparation steps and minimizes exposure to mercury-containing compounds. Each tube contains optimized reagent concentrations and pH conditions to maximize sensitivity while minimizing common interferences from calcium and magnesium ions that can affect traditional Nessler determinations.
Features & Benefits
Pack Size
- 25-Pack
- 50-Pack
Weight
- 0.26 kg
Dimensions
- L: 8.8 mm
- W: 7.3 mm
- H: 5.9 mm
Comparison Guide
| Feature | This Product | Typical Alternative | Advantage |
|---|---|---|---|
| Test Format | Pre-sealed reagent tubes with integrated sampling | Laboratory reagent preparation and glassware setup required | Eliminates reagent preparation steps and reduces potential for contamination or measurement errors in field conditions. |
| Reaction Time | 3-5 minute colorimetric development | Similar reaction kinetics but may require longer stabilization periods | Rapid results support real-time sampling decisions and efficient field survey workflows. |
| Equipment Requirements | No external instrumentation needed | Requires spectrophotometer, pipettes, and volumetric glassware | Self-contained system enables testing in remote locations without laboratory infrastructure or power requirements. |
| Shelf Stability | 18-month ambient temperature storage | Reagent solutions typically require shorter storage periods and refrigeration | Extended shelf life reduces inventory management requirements and reagent waste from expiration. |
| Sample Volume | Half-tube volume requirement | Varies by protocol but often requires larger sample volumes | Minimizes sample collection requirements while maintaining adequate reaction volumes for reliable analysis. |
This ammonia nitrogen test system provides field-portable colorimetric analysis with simplified procedures and extended shelf stability. The pre-sealed tube format eliminates reagent preparation while maintaining the established Nessler method chemistry for quantitative ammonia nitrogen determination.
Practical Tips
Verify colorimetric chart accuracy periodically using certified ammonia nitrogen reference standards at known concentrations.
Why: Color chart fading or environmental exposure can affect accuracy of concentration determinations.
Maintain consistent lighting conditions during color comparison, preferably using natural daylight or standardized artificial illumination.
Why: Color perception varies significantly under different lighting conditions, affecting concentration reading accuracy.
Complete the entire analysis within the specified 3-5 minute reaction window for optimal color development.
Why: Extended reaction times can lead to color changes or precipitation that affect quantitative determination.
Handle tubes carefully to prevent breakage and avoid direct contact with mercury-containing Nessler reagent contents.
Why: Mercury compounds present toxicity hazards and require proper handling and disposal procedures.
If color development appears weak or inconsistent, verify complete sample-reagent mixing and proper reaction timing.
Why: Incomplete mixing or incorrect timing can result in non-uniform color development and inaccurate readings.
Store unused tubes in original packaging away from temperature extremes and direct sunlight to maintain reagent stability.
Why: Environmental exposure can degrade reagent components and affect color development kinetics.
Record sampling conditions, reaction timing, and lighting conditions for each measurement to ensure reproducible results.
Why: Documentation of analytical conditions enables troubleshooting and verification of measurement quality in field studies.
Setup Guide
What’s in the Box
- Sealed ammonia nitrogen reagent tubes (typical)
- Colorimetric reference chart (typical)
- Product instruction sheet (typical)
- Safety data sheet for reagent handling (typical)
Warranty
ConductScience provides standard manufacturer warranty coverage for product defects and reagent integrity issues. Technical support is available for method optimization and troubleshooting analytical procedures.
Compliance
References
Background reading relevant to this product:
What interferences should I expect with the Nessler method in environmental water samples?
Common interferences include calcium and magnesium ions, organic compounds, and residual chlorine. The pre-optimized reagent formulation minimizes some ionic interferences, but complex matrices may require sample pretreatment or alternative analytical methods for accurate quantification.
How does this tube format compare to traditional Nessler spectrophotometric methods?
The tube format eliminates reagent preparation and reduces handling of mercury compounds but relies on visual colorimetric comparison rather than spectrophotometric measurement. This trades some precision for convenience and field portability.
What is the detection range and precision of these test tubes?
Specific detection limits, linear range, and precision data are provided in the product datasheet. Performance depends on water matrix complexity and adherence to the prescribed reaction timing and color comparison procedures.
Can these tubes be used for ammonia determination in biological samples or culture media?
While the Nessler chemistry is applicable to biological matrices, sample complexity and potential protein interference may affect accuracy. Dilution or sample pretreatment may be necessary for reliable results in high-organic content samples.
What storage conditions are required to maintain the 18-month shelf life?
Store tubes at normal ambient temperatures away from direct sunlight and temperature extremes. The aluminum foil sealing protects against moisture and light degradation of the mercury-based reagents.
How do I verify the accuracy of colorimetric readings?
Use certified reference materials or prepare known ammonia nitrogen standards to verify color chart accuracy. Consistent lighting conditions and proper reaction timing are critical for reproducible colorimetric determinations.
What safety precautions are necessary when using these mercury-containing reagent tubes?
Handle tubes carefully to prevent breakage and reagent exposure. Dispose of used tubes according to local regulations for mercury-containing waste. Avoid direct skin contact with reagent contents and ensure adequate ventilation during use.
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