Merck MQuant® Nitrate Test Strips (1.10020.0001)

Overview

The Merck MQuant® Nitrate Test Strips (Catalog No. 1.10020.0001) are precision-engineered qualitative and semi-quantitative tools for rapid determination of nitrate (NO₃⁻) concentration in aqueous samples. Based on a validated colorimetric reaction—where nitrate is reduced to nitrite under acidic conditions and subsequently coupled with a sulfanilamide-based reagent to form a stable azo dye—the test delivers visually interpretable results within 60 seconds. This method aligns with established principles described in ISO 7890-3 and ASTM D3371 for nitrate screening in environmental water matrices. The strips are manufactured under Merck’s ISO 9001-certified quality system and calibrated against traceable NIST-traceable nitrate standards. Designed for field deployment and laboratory bench use, they require no instrumentation, power supply, or reagent preparation—making them ideal for decentralized monitoring programs, emergency response, educational labs, and routine compliance checks where speed and operational simplicity are critical.

Key Features

• Pre-coated, single-use dip-and-read strips with integrated reaction chemistry—no liquid reagents or pipetting required.
• Six-point semi-quantitative scale (10, 25, 50, 100, 250, 500 mg/L NO₃⁻) enabling rapid visual estimation with documented repeatability (±15% RSD at mid-range concentrations under controlled lighting).
• Stable shelf life of ≥24 months when stored unopened at 2–30 °C; desiccant-sealed vial packaging ensures humidity resistance.
• Optimized for direct immersion in clarified water samples—including drinking water, surface water, groundwater, and treated effluent—without dilution in most cases.
• Interference mitigation: Formulated to minimize cross-reactivity with common anions (e.g., chloride ≤1000 mg/L, sulfate ≤500 mg/L) and low-level nitrite (<1 mg/L).
• CE-marked and compliant with EU Directive 2001/83/EC for in vitro diagnostic performance characteristics applicable to environmental screening tools.

Sample Compatibility & Compliance

These test strips are validated for use with potable water, freshwater, wastewater effluents, agricultural runoff, and aquarium systems. Turbid or highly colored samples should be filtered (0.45 µm membrane) prior to analysis to avoid optical interference. While not intended for regulatory reporting without confirmatory validation (e.g., ion chromatography or UV spectrophotometry), the MQuant® Nitrate Test supports Tier-1 screening per EPA Guidance Document 815-B-09-001 and serves as a GLP-aligned preliminary assessment tool in laboratories operating under ISO/IEC 17025 frameworks. Documentation includes lot-specific Certificate of Analysis and batch calibration verification reports available upon request.

Software & Data Management

As a non-instrumental, analog readout system, the MQuant® Nitrate Test Strip does not interface with digital software platforms or LIMS. However, its standardized color chart (included in each vial and available as a downloadable PDF from Merck’s official technical library) is compatible with digital image capture workflows. Users may integrate strip readings into electronic lab notebooks (ELNs) or QA/QC logs using standardized annotation protocols. For audit readiness, raw strip images—captured under D65 daylight simulation—can be archived alongside metadata (sample ID, time/date, operator, ambient temperature) to satisfy basic 21 CFR Part 11 documentation expectations for manual methods.

Applications

• Routine surveillance of nitrate levels in municipal drinking water distribution networks (per WHO guideline value of 50 mg/L NO₃⁻).
• On-site assessment of agricultural leaching impacts in shallow aquifers and tile drainage systems.
• Educational demonstrations of nitrogen cycle dynamics and eutrophication risk indicators.
• Pre-screening prior to formal analysis by certified labs—reducing analytical cost and turnaround time.
• Emergency response during flood events or manure spill incidents requiring immediate nitrate hazard triage.
• Quality control of reverse osmosis and ion exchange treatment units in industrial water reuse facilities.

FAQ

What is the detection limit and upper range of this test?
The visual detection limit is 10 mg/L NO₃⁻; the upper quantifiable limit is 500 mg/L NO₃⁻. Concentrations above 500 mg/L require dilution with nitrate-free deionized water and subsequent recalculation.
Can these strips be used in seawater or high-salinity samples?
Performance is compromised above 10,000 mg/L total dissolved solids (TDS); seawater (≈35,000 mg/L TDS) requires matrix-matched calibration or alternative methods such as cadmium reduction followed by spectrophotometry.
How should results be documented for internal QA records?
Photographic documentation under standardized lighting, paired with annotated strip charts and sample metadata, fulfills minimum traceability requirements for non-regulated internal use.
Are there any known interferences I should control for?
Strong oxidizers (e.g., chlorine >2 mg/L), heavy metals (Fe³⁺ >1 mg/L), and turbidity >50 NTU may suppress or distort color development; pre-treatment with sodium thiosulfate (for residual chlorine) or filtration is recommended.
Is this test accepted for regulatory compliance reporting?
No—it is designated for screening only. Regulatory submissions require confirmation via EPA-approved methods (e.g., Method 353.2, ISO 10304-1, or ASTM D4377) performed on validated instrumentation.