HuaiAi GC-9560-HT TVOC-Specific Gas Chromatograph

Overview

The HuaiAi GC-9560-HT TVOC-Specific Gas Chromatograph is a dedicated analytical system engineered for the precise quantification of Total Volatile Organic Compounds (TVOC) in indoor air samples, in strict compliance with GB 50325–2020 (the latest revision of the *Code for Control of Indoor Environmental Pollution in Civil Building Engineering*). TVOC is defined as the aggregate mass concentration of all volatile organic compounds eluting between n-hexane and n-hexadecane (boiling points ≤250°C at standard atmospheric pressure), measured as equivalent to toluene or benzene depending on calibration protocol. This instrument implements a validated two-stage thermal desorption–gas chromatography workflow: ambient air is collected onto Tenax-TA sorbent tubes at 500 mL/min for 20 min (10 L total volume), followed by thermally assisted desorption at 250°C for 5 min with 50 mL/min purge gas flow. The desorbed analytes are transferred via nitrogen carrier gas into a 60 m × 0.53 mm i.d. × 1.0 µm film thickness fused-silica capillary column, separated under programmed temperature conditions (50°C hold 10 min → 5°C/min → 250°C), and detected using a flame ionization detector (FID) operating at 250°C. The system’s architecture integrates robust temperature control, high-stability pneumatic regulation, and low-bleed column compatibility to ensure reproducible retention times and linear response across the target VOC range (C6–C16).

Key Features

• Integrated oven design with precision PID-controlled heating and forced-air cooling, enabling rapid thermal cycling (350°C → 50°C in under 5 minutes) without column degradation.
• Dual independent temperature zones: programmable column oven (ambient +8°C to 399°C, ±0.1°C stability) and separately controlled inlet (up to 399°C) and detector (up to 399°C) modules.
• Electronic pneumatic control (EPC) for carrier gas (N₂), with continuous monitoring and feedback-regulated flow (0–500 mL/min) and pressure (0–0.4 MPa) across all operational modes.
• Optimized inlet configuration supporting split/splitless injection and direct thermal desorption interface compatibility with standard 6 mm OD Tenax-TA tubes.
• High-resolution separation capability enabled by long-format (60 m), wide-bore (0.53 mm), medium-film (1.0 µm) polyethylene glycol (WAX-type) or 5% phenyl methyl polysiloxane columns—validated per GB 50325–2020 Annex D requirements.
• Front-panel keypad and LCD interface for standalone method setup; full remote operation and data acquisition via Y-300 chromatography workstation software.

Sample Compatibility & Compliance

The GC-9560-HT is validated for analysis of air samples collected on standardized sorbent tubes (Tenax-TA, Carbopack B/C, or equivalent), including those specified in ISO 16000-6:2011 (*Indoor air — Part 6: Determination of volatile organic compounds in indoor and test chamber air by active sampling on Tenax TA sorbent, thermal desorption and gas chromatography using MS or FID*). It meets the instrumental performance criteria outlined in GB 50325–2020 Sections 6.7.2 and 6.7.3, including resolution ≥1.5 for critical pairs (e.g., m/p-xylene), retention time repeatability ≤0.5%, and quantitative linearity R² ≥0.999 over 0.05–5.0 mg/m³ for toluene-equivalent TVOC. The system supports GLP-compliant audit trails when operated with Y-300 software configured for 21 CFR Part 11–aligned user access controls and electronic signature logging.

Software & Data Management

The Y-300 Chromatography Workstation provides full instrument control, peak integration, calibration curve generation (single-point, multi-level, internal standard), and report export in PDF, CSV, and XML formats. It includes built-in templates aligned with GB 50325–2020 reporting requirements, auto-calculating TVOC concentration based on total identified peak areas (excluding n-hexane and interfering siloxanes), sample volume correction (temperature/pressure), and blank subtraction. Audit trail functionality records all method edits, integration parameter changes, and result approvals with timestamps and operator IDs. Data files are stored in a secure, encrypted local database with optional network backup and role-based access permissions.

Applications

• Regulatory compliance testing of residential, commercial, and public building interiors prior to occupancy (GB 50325–2020 Class I & II environments).
• Quality assurance in furniture, flooring, paint, adhesive, and insulation material manufacturing—evaluating off-gassing profiles under controlled chamber conditions (ISO 16000-9, ISO 16000-11).
• Occupational hygiene monitoring in laboratories, printing facilities, and coating application sites.
• Research applications in environmental chemistry, including source apportionment studies and sorbent breakthrough evaluation.
• Method development and validation for emerging VOCs (e.g., terpenes, glycol ethers, chlorinated solvents) within the C6–C16 boiling point window.

FAQ

What regulatory standards does this system support?
It is fully aligned with GB 50325–2020, ISO 16000-6:2011, and ASTM D5197–18 for ambient air TVOC analysis.
Can the system accommodate alternative detectors such as PID or ECD?
The GC-9560-HT platform supports FID as standard; retrofitting with PID or ECD requires mechanical and electrical modification and is not covered under factory warranty or validation protocols.
Is thermal desorption hardware included with the base configuration?
No—the GC-9560-HT is supplied as a core chromatograph. A dedicated thermal desorber (e.g., Y-300 series) and Tenax-TA sampling tubes are provided as part of the complete TVOC analysis kit.
What column types are recommended for TVOC analysis per GB 50325–2020?
A 60 m × 0.53 mm × 1.0 µm polyethylene glycol (WAX) or 5% phenyl methyl polysiloxane column is specified; column certification documentation must accompany each installation.
Does the Y-300 software support LIMS integration?
Yes—via configurable ODBC drivers and HL7-compliant output modules for seamless connection to laboratory information management systems.