Portable GC-MS 3500S

Overview

The EXPEC 3500S Portable GC-MS is based on gas chromatography-mass spectrometry (GC-MS) technique for the analysis of organic pollutants in the field. It can be equipped on a mobile carrier for monitoring, or can be moved over the shoulder or handheld to sites that are inaccessible by car for rapid qualitative and quantitative analysis of volatile and semi-volatile organic chemical contaminants. The EXPEC 3500S Portable GC-MS uses a single mass spectrometer membrane injection technique, gas chromatography separation technique and ion trap mass spectrometry technique. After passing through the pre-treatment equipment, the sample is fed through a chromatographic injection system or a membrane injection system and then into a mass analyzer to be tested to obtain the qualitative and quantitative results of the sample.

The EXPEC 3500S Portable GC-MS consists of an injection system, a gas chromatography module, a gas-mass interface and a mass spectrometry module. The principle of operation is shown in Figure 1: the sample enters the chromatographic separation module through the injection system, where the sample is separated; the separated sample then enters the mass spectrometry module in turn for analysis, and finally the qualitative and quantitative results are obtained through data processing.

Figure 1Block Diagram of EXPEC 3500S Operating Principle

Advantage

As a new portable GC-MS, the EXPEC 3500S not only features a stable and reliable instrument with high environmental adaptability, but also has the advantages of fast analysis speed, high sensitivity, high contamination resistance and a wide range of injection methods.

Fast analysis speed: in addition to the separation efficiency of fast chromatography being 5 times higher than that of conventional chromatography, the membrane injection technique allows the sample to enter the mass spectrometry directly without passing through the chromatography, reducing the response time to seconds, making it very suitable for rapid screening.

A wide range of testing options: with injection modes such as direct mass spectrometry injection, sorptive thermal desorption injection, quantitative ring injection, headspace injection, needle injection and solid phase microextraction injection, covering all the current sample introduction modes on portable GC-MS applications, it enables fast mass spectrometry with second response, ambient air detection at low concentrations, pollution source detection at high concentrations, VOCs and SVOCs detection in water and soil.

Environmental adaptability: the instrument can operate at -5°C to 45°C and a low air pressure of 54kPa; it is also waterproof to IP55.

Easy software operation: intelligent wizard-based operation for sample testing and data analysis, greatly reducing training costs and complexity of field use.

The ion trap's unique multi-stage mass spectrometry scan mode: SIS scans and MS/MS scans can be performed on substances of interest, which can greatly increase detection sensitivity and reduce false positives.

Application

Environmental monitoring

Food safety

Biomedicine

Forensic and Toxicology

Biomedicine

Other application scenarios involving non-methane total hydrocarbon monitoring

Specifications

Performance indexes	Mass range	(15~550) amu
	Resolution	Better than 1amu
	Injection mode	Software switchable single mass spectrometry injection, GC-MS internal standard sorbent tube injection, GC-MS internal standard quantitative ring injection
	Scanning mode	Full Scan, Selective Ion Monitoring (SIM) and Secondary Mass Spectrometry (MS/MS) scanning modes are available
	Sensitivity	Single mass spectrometric injection	Toluene (5mg/m3) S/N: ≥10
		GC-MS sorbent tube injection	Toluene (10ppb) S/N: ≥50
		GC-MS split inlet injection	Octafluoronaphthalene (100 pg/μL): S/N≥15 (272amu)
	Single mass spectrometry response time	Toluene 1 ppm: ≤30s; second response time
	Single mass spectrometry recovery time	Toluene 1 ppm: ≤30s; second recovery to reduce the impact on the next sample
	Dynamic range	10⁷
	Ion source	EI source, ionisation energy 70eV
	Detector	Electron multiplier tube
	Quality analyzer	Ion trap mass analyzer
	Main unit weight	≤20kg (including gas cylinder and battery)
	System volume	44cm×43cm×22cm
	Anti-vibration grade	Meets the requirements of GJB150.16A-2009
	Waterproof grade	Meets IP55
	Vacuum	≤3000 μTorr
	Automatic tuning	The instrument can be automatically calibrated on the mass axis of the main unit
	Calibration function	The internal standard can be added automatically and in real time during the analysis of the sample to achieve the calibration function of the internal standard.
	Pre-sampling function	Ensure that each analysis is not affected by the dead volume of the sampling line
	Blowback function	Ensure that the residue of the sorbent tube after each analysis does not affect subsequent analyses
	Carrier gas	Helium gas in a carrier gas bottle built into the main unit
	Sampling flow	Sampling flow is controlled electronically and adjustable
Operating parameters	Power supply	220VAC±10% / 50HZ, or rechargeable battery
	Environmental temperature	-5 to 45°C
	Storage temperature	-20~70°C
	Relative humidity	(0%~95%) RH
	Ambient pressure	May be used in highland areas.54 kPa~101.3 kPa
External communication	Positioning system	GPS, BeiDou dual-mode system, switchable; real-time positioning of the sample testing site
	Communication mode	LAN
		WIFI
Software	Database	NIST Standard Spectrum Library
		Automated mass spectral deconrolution and identification system (AMDIS)
		National Institute for Occupational Safety and Health (NIOSH) Database
		Instrument Specific Spectrum Library for Environmental Samples
		Safety Instructions of Chemicals (SIC)
		Environmental Standards Reference Database
	Data acquisition	Built-in IPC with touch screen human-machine interaction;
	Data processing	Built-in IPC; human-machine interaction: touch screen External PC; human-machine interaction: keyboard and mouse

Table 1 EXPEC 3500S Specification and Technical Data Sheet

Mass range

Resolution

Injection mode

Dynamic range

Overview

Advantage

Application

Specifications

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