Lianhua Technology LH-TN-K11 Total Nitrogen Quick Test Kit
| Brand | Lianhua Technology |
|---|---|
| Origin | Beijing, China |
| Manufacturer Type | Manufacturer |
| Country of Origin | China |
| Model | LH-TN-K11 |
| Pricing | Available Upon Request |
Overview
The Lianhua Technology LH-TN-K11 Total Nitrogen Quick Test Kit is a field-deployable, colorimetric analytical system engineered for rapid, on-site quantification of total nitrogen (TN) in water samples—including surface water, wastewater, effluent, and drinking water sources. It operates on the principle of alkaline potassium persulfate digestion followed by spectrophotometric detection of nitrate-nitrogen after reduction to nitrite and diazotization with sulfanilamide and N-(1-naphthyl)ethylenediamine dihydrochloride (NEDD). This method conforms to core elements of ISO 11905-1 (Water quality — Determination of nitrogen — Part 1: Total nitrogen as nitrate after alkaline persulfate digestion) and aligns with US EPA Method 353.2 for total oxidized nitrogen. Designed specifically for emergency response, mobile laboratories, and routine environmental monitoring, the LH-TN-K11 eliminates the need for benchtop spectrophotometers or digestion ovens—enabling reliable TN assessment in under 45 minutes with minimal equipment.
Key Features
- Field-Ready Colorimetric Analysis: Integrated reagent-coated reaction vials enable direct visual comparison against a calibrated color scale, delivering semi-quantitative results without instrumentation.
- Optimized Digestion Chemistry: Pre-measured, stabilized alkaline persulfate tablets ensure consistent oxidative digestion efficiency across variable sample matrices, minimizing interference from organic nitrogen and ammonium species.
- Enhanced Color Stability: Reaction products exhibit low photodegradation and high chromophore stability (>30 min), permitting delayed reading without significant signal drift—critical for multi-sample field workflows.
- User-Independent Operation: Standardized protocol requires only pipetting, heating (using portable dry-block heater or boiling water bath), and visual assessment—no calibration curves or software interpretation needed.
- Robust Packaging Architecture: Individually foil-laminated reagent vials and desiccant-sealed main kit housing maintain reagent integrity for ≥18 months at ambient storage (10–30 °C), even under high-humidity conditions typical of field deployments.
Sample Compatibility & Compliance
The LH-TN-K11 is validated for use with clarified aqueous samples having turbidity <5 NTU and chloride concentration <200 mg/L. For high-chloride or heavily colored matrices (e.g., industrial wastewater), optional pretreatment via silver sulfate precipitation or activated carbon adsorption is recommended per ISO 11905-2 guidance. The kit supports compliance with national and regional environmental monitoring requirements, including China’s HJ 636-2012 (Determination of Total Nitrogen in Water by Alkaline Potassium Persulfate Digestion–UV Spectrophotometry) and serves as a documented screening tool within GLP-aligned field sampling programs. While not intended for regulatory reporting without confirmatory lab analysis, its performance meets precision criteria (<15% RSD at 2 mg/L TN) specified in ISO/IEC 17025 for screening-level methods.
Software & Data Management
As a non-instrumental, analog test kit, the LH-TN-K11 does not incorporate embedded firmware or digital connectivity. However, it is fully compatible with Lianhua’s optional digital companion tools—including the LH-DataLink mobile app (iOS/Android)—which enables photo-based color matching using smartphone RGB calibration, automated result logging, GPS-tagged sampling metadata capture, and export to CSV or PDF formats compliant with internal QA/QC documentation standards. All generated records support audit-ready traceability, with timestamping, operator ID fields, and version-controlled color scale references aligned with FDA 21 CFR Part 11 principles for electronic records where adopted voluntarily by end users.
Applications
- Rapid TN screening during environmental incident response (e.g., agricultural runoff events, sewage overflows)
- Pre-treatment verification in decentralized wastewater systems and septic tank maintenance programs
- Field validation of TN removal efficiency in constructed wetlands and bioreactors
- Baseline surveys for ecological monitoring in lakes, rivers, and reservoirs
- Training and capacity-building for municipal water technicians and community-based monitoring initiatives
FAQ
What is the detection range of the LH-TN-K11?
The kit provides visual quantification across 0–10 mg/L TN, with extended range options (0–50 mg/L) available via dilution protocol outlined in the included instruction manual.
Can the LH-TN-K11 be used for seawater analysis?
Direct application is not recommended due to chloride interference; however, modified protocols involving chloride masking with mercuric sulfate or ion-exchange pretreatment are documented in Lianhua’s Technical Bulletin TB-TN-04.
How should expired reagents be disposed of?
All components must be treated as hazardous chemical waste per local regulations—particularly persulfate salts and aromatic amine reagents—and disposed of through certified chemical waste contractors.
Is method validation data available?
Yes—certified reference material (CRM) recovery studies (NIST SRM 1643e), interlaboratory comparison reports, and matrix spike/recovery data are provided upon request under NDA.
Does the kit include a portable heater?
No—the LH-TN-K11 is supplied as a reagent-only kit; users must supply a dry-block heater (95–100 °C) or boiling water bath, both of which are widely available in field equipment inventories.
