GDYS-102SA2 Nitrate Nitrogen Analyzer by Jilin University Xiaotian’e

Overview

The GDYS-102SA2 Nitrate Nitrogen Analyzer is a field-deployable, photometric water quality analyzer engineered for rapid, quantitative determination of nitrate nitrogen (NO₃⁻-N) in freshwater, surface water, groundwater, and treated effluent. It operates on the principle of spectrophotometric detection following cadmium reduction and diazotization-coupling reaction—aligned with standard methods such as EPA Method 353.2 and ISO 7890-3. The instrument integrates a fixed-wavelength optical system (typically centered at 540 nm), calibrated solid-state detector, and embedded microprocessor control to deliver reproducible results without laboratory infrastructure. Designed for environmental field technicians, municipal water operators, and regulatory compliance officers, it supports real-time decision-making during source water surveillance, wastewater discharge verification, and agricultural runoff assessment.

Key Features

• Field-optimized portable architecture: Weighing under 650 g with integrated rechargeable Li-ion battery (≥8 hours continuous operation), enabling extended deployment in remote sampling locations.
• Pre-calibrated optical path: Fixed 10-mm optical path cuvette chamber with temperature-compensated LED light source and photodiode detector ensures minimal drift across ambient conditions (10–35 °C).
• Single-use reagent kit system: Each GDYS-certified test kit contains lyophilized reagents for cadmium column reduction, sulfanilamide, and N-(1-naphthyl)ethylenediamine dihydrochloride—pre-measured, vacuum-sealed, and lot-numbered for traceability.
• On-device calibration verification: Built-in reference check function using certified zero and mid-range standards validates photometric integrity before each analytical batch.
• Ruggedized industrial design: IP65-rated enclosure with rubberized grip and shock-absorbing housing meets IEC 60529 for dust and water resistance during transport and outdoor use.

Sample Compatibility & Compliance

The GDYS-102SA2 accepts raw or filtered water samples (no centrifugation required) with turbidity ≤5 NTU and chloride concentration <200 mg/L. It complies with national standard HJ 535–2009 (China) for nitrate nitrogen determination in water and aligns with methodological equivalency to ASTM D3867–18 (Standard Test Method for Nitrate in Water by Cadmium Reduction). While not FDA 21 CFR Part 11–compliant due to its standalone firmware architecture, audit logs—including date/time stamp, operator ID (manually entered), sample ID, and measured absorbance—are stored locally for GLP-aligned record retention. Data export is supported via USB-C to CSV files compatible with LIMS integration.

Software & Data Management

The device features an embedded 3.2-inch TFT LCD interface with intuitive icon-driven navigation and multilingual support (English, Spanish, Portuguese, Arabic). All measurements are automatically timestamped and stored in non-volatile memory (capacity: ≥500 records). USB-C connectivity enables direct transfer of measurement history, calibration logs, and reagent lot tracking data to Windows/macOS systems. Optional GDYS DataLink desktop software (v2.4+) provides statistical summary reports (mean, SD, CV%), trend visualization over time, and export to PDF or Excel formats compliant with internal QA documentation requirements.

Applications

• Regulatory field screening for drinking water sources against WHO guideline value (50 mg/L NO₃⁻; equivalent to 11.3 mg/L NO₃⁻-N) and EU Directive 2020/2184 limits.
• Monitoring nitrate leaching from agricultural zones adjacent to shallow aquifers and riparian buffers.
• Verification of denitrification efficiency in tertiary wastewater treatment plants prior to discharge.
• Educational use in university environmental science labs for method validation exercises and student-led field campaigns.
• Emergency response during fertilizer spill incidents or manure lagoon breaches requiring rapid nitrate nitrogen quantification.

FAQ

What sample volume is required for analysis?
A minimum of 10 mL of homogenized water sample is required. No filtration is necessary unless turbidity exceeds 5 NTU.
Can the instrument measure nitrate nitrogen in seawater or high-salinity samples?
No—elevated chloride concentrations (>200 mg/L) interfere with the cadmium reduction step; desalination pretreatment is required for brackish or marine matrices.
How often must the optical system be recalibrated?
Factory calibration remains stable for ≥12 months under normal use; annual verification using GDYS-certified calibration standards is recommended per ISO/IEC 17025 guidance.
Are reagent kits supplied with lot-specific certificates of analysis?
Yes—each kit includes a CoA documenting assay linearity (R² ≥0.995), recovery (95–105%), and shelf-life expiration under 25 °C storage.
Is firmware upgrade supported in the field?
Yes—via USB-C connection using GDYS Firmware Update Utility; version history and release notes are published on the official technical support portal.