Heipu 5B-3BN(V8) Total Nitrogen Analyzer

Overview

The Heipu 5B-3BN(V8) Total Nitrogen Analyzer is a dedicated laboratory instrument engineered for the quantitative determination of total nitrogen (TN) in aqueous environmental samples—including surface water, groundwater, wastewater, and effluent streams. It implements a standardized UV spectrophotometric method following alkaline potassium persulfate digestion, in accordance with widely adopted regulatory protocols such as HJ 636–2012 (China’s standard for TN determination in water) and principles aligned with ISO 11905-1 (Water quality — Determination of nitrogen — Part 1: Total nitrogen after acid digestion). The system integrates controlled thermal digestion at 122 °C with precise UV absorbance measurement at 220 nm and 275 nm, enabling correction for nitrate interference via dual-wavelength subtraction. Designed for routine compliance monitoring and research-grade analysis, the instrument delivers high reproducibility across its segmented dynamic range of 0.05–80 mg/L TN, with a documented detection limit of 0.01 mg/L and resolution of 0.001 mg/L.

Key Features

• Integrated digestion and photometric measurement in a single platform, eliminating manual transfer and reducing contamination risk;
• Programmable temperature-controlled digestion block capable of reaching and maintaining 122 °C with ±1 °C stability, supporting full compliance with HJ 636–2012 digestion requirements;
• Color LCD interface with intuitive navigation, real-time status feedback, and on-screen calibration prompts;
• Automated curve generation: instrument calculates and stores calibration curves from standard solutions without manual slope/intercept input;
• 24 programmable calibration curves—20 factory-loaded for common matrices and 4 fully customizable and savable regression curves;
• Batch processing capacity of 15 samples per run, optimized for throughput in municipal and industrial lab environments;
• Auto-timing and temperature-hold alerts with user-adjustable duration settings, ensuring consistent digestion kinetics;
• RS232 serial interface compliant with standard laboratory data acquisition systems for traceable data export.

Sample Compatibility & Compliance

The 5B-3BN(V8) is validated for use with clarified, filtered, or centrifuged liquid samples meeting standard pretreatment criteria for TN analysis. It accommodates sample volumes of 5–10 mL and tolerates moderate turbidity (<5 NTU) and chloride concentrations up to 1,000 mg/L without significant interference. All digestion vessels are constructed from borosilicate glass to withstand repeated exposure to alkaline persulfate under elevated temperature and pressure. The analyzer supports documentation practices required under GLP (Good Laboratory Practice) frameworks, including time-stamped measurement logs, operator ID tagging (via external software integration), and audit-ready data files. While not certified to FDA 21 CFR Part 11 out-of-the-box, its RS232 output enables secure integration with LIMS platforms that enforce electronic signature and change-control workflows.

Software & Data Management

Data handling is structured around traceability and long-term integrity. The instrument stores up to 3,000 complete measurement records—including sample ID, date/time stamp, measured absorbance values, calculated concentration, curve ID used, and digestion parameters. All stored data can be printed directly via optional thermal printer or exported in CSV format via RS232 to PC-based applications. No proprietary software is bundled; instead, raw ASCII-formatted transmission enables compatibility with third-party tools (e.g., Excel, LabArchives, or custom Python/Matlab parsers). Calibration curve metadata—including wavelength pair, blank correction method, and polynomial order—is embedded in each saved curve file, ensuring method transparency and revalidation readiness.

Applications

• Regulatory compliance testing for municipal wastewater treatment plants (WWTPs) reporting to local environmental authorities;
• Monitoring nutrient loading in lake and reservoir management programs;
• Process control in industrial effluent treatment facilities (e.g., food processing, pharmaceutical manufacturing);
• Academic and governmental research on eutrophication dynamics and nitrogen cycling;
• Quality assurance for drinking water source assessment and reclaimed water reuse verification;
• Method validation and interlaboratory comparison studies requiring robust, low-maintenance TN instrumentation.

FAQ

What digestion reagents are required for operation?
Potassium persulfate and sodium hydroxide are the primary reagents specified in HJ 636–2012. Reagent-grade chemicals meeting ACS or equivalent purity standards are recommended.
Can the instrument measure total phosphorus simultaneously?
No—the 5B-3BN(V8) is dedicated exclusively to total nitrogen analysis. For combined TN/TP analysis, separate instrumentation or sequential runs using compatible methods are required.
Is external cooling required during digestion?
No—thermal management is fully internal; the unit includes passive heat dissipation and automatic cooldown sequencing post-digestion.
How often must calibration curves be verified?
Per standard practice, daily verification with at least one mid-range standard is advised when performing regulated analyses; full multi-point recalibration is recommended weekly or after reagent lot changes.
Does the device support network connectivity (e.g., Ethernet or Wi-Fi)?
No—it features RS232 only. Network integration requires an external serial-to-Ethernet converter compatible with Modbus RTU or ASCII protocol mapping.