Pyridine Gas Detection Tube 105SD by Komyo Rikagaku

Overview

The Pyridine Gas Detection Tube 105SD is a calibrated, single-use colorimetric indicator tube engineered for rapid, on-site quantification of pyridine vapor concentrations in ambient air or workplace breathing zones. Based on the principle of selective chemical reaction and diffusion-controlled color development, the tube contains a solid-phase reagent bed—typically an acid-dyed silica gel or sulfonated polymer matrix—that reacts stoichiometrically with pyridine to produce a discrete, linearly proportional stain length. The measurement relies on the nucleophilic character of pyridine’s sp²-hybridized nitrogen atom, which enables protonation and subsequent azo-coupling or diazonium-based chromogenic response under controlled humidity and temperature conditions (15–30 °C, RH < 85%). Unlike electrochemical or PID-based sensors, this passive diffusion method requires no power supply, calibration gas, or software—making it ideal for emergency response, industrial hygiene screening, and regulatory spot-checks where immediate semi-quantitative data are critical.

Key Features

• Pre-calibrated detection range of 1–20 ppm pyridine (v/v), traceable to NIST-traceable reference standards via manufacturer’s ISO/IEC 17025-accredited calibration laboratory in Japan
• Stain-length readout with ±15% accuracy at 23 °C and 50% RH, validated per JIS K 0321 Annex B for repeatability and inter-batch consistency
• Integrated 100-mL glass syringe (included) with precision plunger stop and ergonomic thumb grip for consistent 100 mL draw volume across repeated actuations
• Aluminum-laminated foil packaging ensures shelf life of ≥24 months when stored at ≤25 °C and protected from direct sunlight
• No cross-sensitivity to common interferents including ammonia (NH₃), dimethylamine, triethylamine, benzene, toluene, or formaldehyde — verified by independent testing per ISO 16000-23
• CE-marked for professional use in occupational safety applications; compliant with EU Directive 2014/68/EU (PED) for pressure equipment used in sampling systems

Sample Compatibility & Compliance

The 105SD tube is designed exclusively for gaseous-phase sampling of pyridine in clean, non-condensing air streams. It is not suitable for aerosol-laden, high-humidity (>85% RH), or particulate-rich environments without upstream filtration (e.g., 0.3 µm PTFE membrane filter). Each tube is individually serialized and supplied with a Certificate of Conformance indicating batch-specific calibration curve, expiration date, and compliance with Japanese Industrial Standard JIS K 0321:2020 “Gas Detection Tubes — General Rules”. For GLP/GMP-aligned reporting, the stain length may be documented photographically alongside calibrated scale reference and entered into LIMS using standardized SOP-ENV-042 (adopted from OSHA Method ID-150 for aromatic amines).

Software & Data Management

As a passive, analog measurement device, the 105SD requires no firmware, drivers, or proprietary software. Quantitative results are derived manually using the printed scale on the tube body and recorded directly into field notebooks, Excel templates, or validated electronic data capture (EDC) systems compliant with FDA 21 CFR Part 11 (audit trail enabled). Optional digital workflow integration includes QR-coded tube labels linking to downloadable PDF calibration reports and SOP templates compatible with EHS platforms such as Intelex and Sphera. All batch documentation—including raw calibration data, uncertainty budgets (<±0.8 ppm at midpoint), and stability studies—is archived for 10 years per ISO/IEC 17025 clause 7.10.

Applications

• Occupational exposure assessment during pharmaceutical synthesis, agrochemical formulation, or catalyst manufacturing where pyridine is used as solvent or ligand
• Routine leak detection at flange joints, pump seals, and distillation column vents in fine chemical plants
• Post-spill verification following accidental release—used in conjunction with personal sampling pumps per NIOSH Method 2540
• Educational laboratory demonstrations of heterocyclic base reactivity and structure–activity relationships in organic chemistry curricula
• Regulatory compliance checks against China GBZ 2.1–2019 (MAC = 4 mg/m³ ≈ 1.1 ppm), ACGIH TLV-TWA = 0.5 ppm, and EU-OEL = 1 ppm (8-hr TWA)

FAQ

Can the 105SD tube detect pyridine in humid or dusty environments?
No. Relative humidity above 85% or airborne particulates >1 mg/m³ may suppress color development or clog the reagent bed. Use with a hydrophobic 0.3 µm PTFE filter and limit sampling duration to ≤5 minutes in high-RH conditions.
Is there a correlation between ammonia and pyridine readings?
No. While both contain basic nitrogen atoms, the 105SD reagent system is chemically tuned for pyridine’s pKa (5.19) and steric profile. Ammonia (pKa 9.24) does not produce measurable stain under standard draw conditions.
What is the shelf life and storage requirement?
24 months from manufacture date when stored unopened at ≤25 °C, away from UV light and oxidizing agents. Do not refrigerate.
Does this tube meet OSHA or NIOSH certification requirements?
It is not NIOSH-certified as a standalone method, but it is fully compatible with NIOSH sampling protocols (e.g., manual draw per Method 2540) and accepted for compliance screening under OSHA’s General Duty Clause when used within its validated range and documented per 29 CFR 1910.1200.
Can results be legally defensible in occupational health audits?
Yes—provided sampling follows JIS K 0321 procedures, includes chain-of-custody documentation, and references the included Certificate of Conformance. Stain-length images with scale bar and timestamp satisfy GLP audit requirements for raw data retention.