ZR-J02B Airborne Fluoride Sampling Head

Overview

The ZR-J02B Airborne Fluoride Sampling Head is a precision-engineered passive sampling interface designed for quantitative collection of both gaseous and particulate-phase fluoride compounds from ambient air. It operates on the principle of dual-phase retention: gaseous hydrogen fluoride (HF) and fluorosilicic acid (H₂SiF₆) are chemically immobilized via reaction with potassium hydrogen phosphate (K₂HPO₄) impregnated onto high-efficiency cellulose ester or polytetrafluoroethylene (PTFE) filter media, while airborne particulate fluorides—including calcium fluoride (CaF₂), sodium fluoride (NaF), and aluminum fluoride (AlF₃)—are physically captured by inert filtration. The collected fluorides remain stable on the membrane under standard field storage conditions (≤4 °C, dark, ≤72 h), enabling subsequent quantitative analysis via fluoride ion-selective electrode (ISE) potentiometry following acid leaching with dilute hydrochloric acid (HCl). This methodology conforms strictly to the Chinese national standard HJ 955–2018, which defines performance criteria for detection limits, recovery efficiency, and inter-laboratory reproducibility in ambient air monitoring.

Key Features

• Optimized dual-layer design accommodating standardized 47 mm or 90 mm diameter filter membranes for consistent airflow distribution and minimal channeling.
• Chemically inert housing constructed from anodized aluminum alloy and PTFE-coated internal surfaces to prevent fluoride adsorption or leaching during sampling.
• Calibrated inlet geometry ensuring laminar flow profiles across the full operational range (16.7–100 L/min), validated per ISO 7708:1995 for inhalable particle fraction alignment.
• Integrated O-ring seal and torque-specification mounting mechanism guarantee leak-tight coupling with compatible low-flow or high-volume air samplers (e.g., ZR-3000 series, SKC AirCheck, or Gilian pumps).
• Traceable calibration documentation provided with each unit, including pressure drop characterization at 50 L/min (±2% tolerance) and backpressure compliance under continuous operation for ≥8 h.

Sample Compatibility & Compliance

The ZR-J02B is validated for use with filter media meeting GB/T 17039–2021 specifications for pore size (0.8 µm nominal), tensile strength (>10 N), and fluoride blank levels (<0.05 µg per 47 mm disc). It supports sequential sampling protocols required for speciation studies (e.g., separate capture of HF vs. particulate F⁻ using denuder–filter configurations). All units undergo factory verification against HJ 955–2018 acceptance criteria: spike recovery ≥85–115%, method detection limit (MDL) ≤0.05 µg/m³ (at 100 L/min, 24 h), and within-lot coefficient of variation ≤6.2%. The device is compatible with GLP-compliant workflows and supports audit-ready recordkeeping when paired with certified volumetric flow calibrators traceable to NIM (National Institute of Metrology, China).

Software & Data Management

While the ZR-J02B itself is a hardware sampling interface without embedded electronics, it integrates seamlessly into digital environmental data acquisition ecosystems. When used with Junray’s ZR-3000 series intelligent air samplers, real-time flow rate, temperature, pressure, and cumulative volume are logged with timestamped metadata compliant with ISO/IEC 17025:2017 Clause 7.5.2. Raw ISE measurement data generated downstream (e.g., via Orion Dual Star or Metrohm 940 Professional IC systems) can be imported into Junray’s optional E-SAM v3.2 software for automated calibration curve fitting, blank subtraction, uncertainty propagation (per GUM Supplement 1), and PDF report generation aligned with CNAS-CL01:2018 requirements.

Applications

• Ambient air quality monitoring networks operated by provincial ecological environment monitoring centers (PEEMCs) and municipal environmental protection bureaus.
• Compliance verification near aluminum smelters, phosphate fertilizer plants, semiconductor etching facilities, and coal-fired power stations where HF emissions are regulated.
• Source apportionment studies combining ZR-J02B-collected samples with isotopic analysis (δ¹⁸O–F, δ¹¹B–F) for emission fingerprinting.
• Health risk assessment campaigns measuring chronic low-level fluoride exposure in residential zones adjacent to industrial corridors.
• Method validation and interlaboratory comparison exercises organized under the China National Environmental Monitoring Centre (CNEMC) proficiency testing program.

FAQ

Is the ZR-J02B compatible with international standards such as ISO 10427 or ASTM D7385?
The ZR-J02B is specifically engineered to meet HJ 955–2018; however, its physical dimensions, flow dynamics, and chemical retention mechanism align with the functional requirements of ISO 10427:2003 (airborne fluoride sampling) and ASTM D7385–18 (fluoride in ambient air by ion-selective electrode), enabling cross-standard method adaptation with documented equivalency validation.
What filter types are recommended for optimal performance?
Cellulose nitrate (CN) filters impregnated with 1.5% w/v K₂HPO₄ are specified in HJ 955–2018; alternative PTFE or quartz fiber filters may be used if pre-cleaned and verified for fluoride blanks <0.03 µg/disc.
Can the ZR-J02B be used for personal exposure monitoring?
Yes—when mounted on a calibrated personal sampling pump (e.g., Apex Elite) operating at 16.7 L/min, it satisfies the inhalable fraction sampling criterion per ISO 7708 and is routinely deployed in occupational hygiene surveys per GBZ 159–2004.
Does the unit require periodic recalibration?
No recalibration is required for the sampling head itself; however, users must verify system flow rate before each sampling event using a primary standard calibrator (e.g., dry gas meter or bubble flowmeter traceable to NIM).