HKM Ammonia and Phosphate Test Strips – Free Sample Program

Overview

The HKM Ammonia and Phosphate Test Strips (Model No. 090000) are rapid, colorimetric analytical tools engineered for on-site and routine water quality assessment in environmental monitoring, wastewater treatment, aquaculture, and municipal water management applications. These strips operate on the principle of solid-phase reagent chemistry—where analyte-specific reagents immobilized on cellulose-based substrate undergo stoichiometric color development upon contact with target ions in aqueous samples. Ammonia detection employs the indophenol blue method (based on the Berthelot reaction), while phosphate quantification follows the molybdenum blue reduction pathway. Both assays deliver semi-quantitative results within 60–120 seconds, enabling immediate field decision-making without instrumentation or laboratory infrastructure.

Key Features

• Pre-calibrated, single-use dip-and-read format requiring no external reagents, pipettes, or power sources
• Simultaneous dual-range capability: Ammonia (0–400 mg/L NH₃-N) and Phosphate (0–400 mg/L PO₄³⁻ as P)
• Stable shelf life of ≥24 months when stored at 2–30 °C in sealed, desiccated packaging
• Batch-certified lot numbers traceable to internal QC protocols compliant with ISO/IEC 17025 principles
• Designed for reproducible visual interpretation under standardized daylight conditions (CIE D65 illuminant equivalent)
• Compatible with raw surface water, treated effluent, cooling tower water, and aquaculture pond samples

Sample Compatibility & Compliance

The test strips demonstrate robust performance across a pH range of 4.5–9.0 and tolerate turbidity up to 100 NTU without filtration. Interference studies confirm minimal cross-reactivity from common co-ions including nitrate (≤500 mg/L), chloride (≤10,000 mg/L), and sulfate (≤2,000 mg/L). While not intended for regulatory reporting under EPA Method 350.1 or ISO 15681-1, these strips meet the functional requirements of ISO 10523 (pH) and ISO 7027 (turbidity) for preliminary screening prior to confirmatory analysis. Their use aligns with GLP-aligned field survey workflows and supports Tier 1 compliance verification per national environmental monitoring guidelines (e.g., China’s HJ/T 91–2002 and US EPA’s “Rapid Field Screening” guidance).

Software & Data Management

As a non-instrumented, analog measurement system, the HKM test strips do not integrate with digital data acquisition platforms or LIMS. However, they support structured manual documentation via standardized field logbooks compliant with ISO/IEC 17025 Clause 7.5.2 (recording of observations). Users may digitize results using HKM’s optional QR-coded strip packaging—scannable to access batch-specific calibration curves, expiration tracking, and printable PDF report templates. All supporting documentation is version-controlled and archived per internal document retention policy aligned with ISO 9001:2015 Clause 7.5.

Applications

• Routine surveillance of influent and effluent streams in municipal and industrial wastewater plants
• Pre-treatment verification in drinking water distribution systems
• Nutrient load monitoring in eutrophication-prone lakes and reservoirs
• Real-time feedback during biological nutrient removal (BNR) process optimization
• Field validation of online ammonia and phosphate analyzers (e.g., UV-Vis or ion-selective electrode systems)
• Educational demonstrations in environmental science laboratories and vocational training programs

FAQ

Are these test strips suitable for drinking water compliance testing?
No—they are designed for rapid screening only. Regulatory compliance requires confirmatory analysis by accredited laboratories using reference methods such as ASTM D1426 (ammonia) or ISO 6878 (phosphate).
What is the minimum detectable concentration for each parameter?
The visual detection limit is 2 mg/L for ammonia and 1 mg/L for phosphate under optimal lighting and observer acuity conditions.
Can results be quantified using smartphone color-matching apps?
HKM does not validate or endorse third-party mobile applications; subjective color perception remains the primary interpretation method per manufacturer instructions.
Is there a certificate of analysis available for each batch?
Yes—certificates listing lot number, manufacturing date, expiration date, and QC pass/fail status are provided digitally upon request.
How should used strips be disposed of?
Treat as non-hazardous solid waste per local regulations; no heavy metals or regulated organic solvents are present in the reagent formulation.