Kitaoka 110S Hydrocarbon (Gasoline) Detection Tube
| Brand | Meiko Rikka |
|---|---|
| Origin | Japan |
| Manufacturer Type | Authorized Distributor |
| Origin Category | Imported |
| Model | 110S |
| Pricing | Upon Request |
Overview
The Kitaoka 110S Hydrocarbon (Gasoline) Detection Tube is a single-use, colorimetric gas sampling device engineered for rapid, on-site quantification of total hydrocarbon vapors—primarily aliphatic and aromatic compounds representative of gasoline—within ambient or workplace air. It operates on the principle of oxidative color development: hydrocarbons (CnHm) reduce hexavalent chromium (Cr6+) in an acidic sulfuric acid matrix to trivalent chromium (Cr3+), generating a progressive color change from orange to dark green along the silica gel substrate. The length of the stained zone is linearly proportional to the concentration of reactive hydrocarbons in the sampled air volume. Calibrated against n-hexane (CH3(CH2)4CH3, MW = 86.18 g/mol), the tube delivers direct %v/v readouts over a nominal range of 0.05–0.6% (500–6000 ppm) with a defined detection limit of 50 ppm. No power source, flame, or laboratory infrastructure is required—making it suitable for emergency response, industrial hygiene surveys, and routine leak screening under field conditions.
Key Features
- Single-step operation: Break both ends, insert into AP-20 hand pump, draw 100 mL air at controlled flow rate; visual endpoint indicated by red plunger pop-out.
- Stable color development: Reaction completes within 60 seconds; color band stabilizes for ≥5 minutes post-sampling, enabling reliable visual interpretation.
- Temperature-compensated calibration: Supplied with dual-axis correction table (10–40°C) to convert observed %v/v reading to true concentration at actual sampling temperature.
- Humidity independence: Performance unaffected by relative humidity across 10–90% RH—critical for outdoor or high-moisture environments.
- Pressure correction protocol: Provided formula enables adjustment for barometric pressure deviations from standard 1013 hPa.
- Shelf life: 36 months from manufacture date when stored sealed at 10–30°C; no refrigeration required.
Sample Compatibility & Compliance
The 110S tube responds quantitatively to saturated aliphatics (e.g., n-hexane, cyclohexane), monoaromatics (benzene, toluene, xylene), and light olefins (ethylene, acetylene). Cross-reactivity is documented: benzene at 400 ppm yields elevated readings; toluene (800 ppm), xylene (2000 ppm), phenol, and aliphatic hydrocarbons also induce positive bias. Users must account for matrix interference when assessing complex emissions or refinery off-gases. While not certified to ISO 8573 or ASTM D2504, the method aligns with OSHA ID-155 and NIOSH 1501 guidance for qualitative/semi-quantitative hydrocarbon screening. Tubes comply with UN Transport Class 9 (non-hazardous for shipping) and meet JIS K 0111:2018 requirements for reagent stability and batch consistency.
Software & Data Management
As a passive, analog measurement system, the 110S requires no software interface or digital data logging. All calculations—including temperature- and pressure-corrected concentration conversion between %v/v, ppm, and mg/m³—are performed manually using the provided equations and reference tables. For traceability in regulated environments (e.g., GLP-compliant site audits), users are advised to record: sampling date/time, ambient temperature and pressure, observed color front position (%v/v), applied corrections, and operator ID on standardized field logs. Digital photography of the developed tube (with calibrated scale reference) may be archived as supplementary evidence per internal QA protocols.
Applications
- Routine monitoring of gasoline vapor concentrations at fueling stations, tank truck loading bays, and underground storage tank vent lines.
- Emergency response triage following spills or leaks in petrochemical facilities, refineries, or transport corridors.
- Industrial hygiene assessments for worker exposure near solvent-handling operations where real-time feedback informs respirator selection or ventilation adjustments.
- Pre-commissioning verification of vapor recovery systems and carbon adsorber breakthrough detection.
- Educational demonstrations of gas-phase redox chemistry and occupational exposure assessment principles.
FAQ
What is the shelf life of the 110S tube, and how should it be stored?
The tube has a guaranteed shelf life of 36 months from the date of manufacture when kept sealed in its original packaging at 10–30°C. Avoid prolonged exposure to direct sunlight or temperatures exceeding 40°C.
Can the 110S be used for quantitative compliance reporting under OSHA or EPA standards?
No. It is intended for rapid screening and trend analysis—not definitive regulatory compliance testing. Confirmatory analysis via GC-FID or GC-MS is required for legally defensible exposure assessments.
How do I convert a %v/v reading to mg/m³ at non-standard temperature?
Use the formula: C (mg/m³) = C (%v/v) × (86.18 / 22.4) × [273 / (273 + t)] × 10⁴, where t = sampling temperature in °C.
Is humidity correction necessary?
No. The reaction kinetics and color development are empirically verified to be independent of ambient humidity across the operational range.
What hand pump is compatible with the 110S tube?
The AP-20 manual piston pump (sold separately) is the designated sampling device, calibrated to deliver precisely 100 mL per full stroke with consistent flow profile.
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