GC-FID / ECD / TCD

HP 5890 GC with two FIDs and HP Automatic Liquid Sampler. The EzChrom Elite Chromatography Data System for GC Control, data acquisition and processing.

Current setup for the analysis of alcohols in water samples. The HP Nitrogen Phosphorous and Electron Capture Detectors are also available by request.

 

Varian 3400 GC with dual ECDs and CTC A 200S Autosampler. The EzChrom Elite Chromatography Data System for data acquisition and processing.

Current setup for EPA methods 551 (for analysis of chlorinated solvents in water), 552 (for analysis of haloacetic acids in water).

 

HP 6890 GC with two FIDs, GC PAL autosampler.  EzChrom Elite Chromatography Data System

The GC can be easily reconfigured with any capillary column and used for any application.

 

 

 

GC  DETECTORS

The GC detector is the brain of any GC instrument. All detectors work by sensing some physical or chemical property of the components passing through the detector cell. The choice of detector type depends on particular analytical purpose and compound of interest (see Table for details).

 

 

FID​

ECD​​

TCD

Type

Universal

Selective

Universal

Destructive

Yes

No

No

Responds to:

Compounds that ionize
in air/H2 flame (C-H bond)

Electronegative Substituents
(halogens, nitro groups,
organometallic compounds)

Compounds having different thermal
conductivity than carrier gas

Linear DynamicRange

107

104

106

Concentration Range

0.5 ng/μl to 500μg/μl

0.5 pg/μl to 1ng/μl

ng/μl  - 100%

Minimum Detectible

Level

Typical Applications

5 pg C/sec

 

Organic solvents &chemicals,
Environmental analyses,
Food & flavors

0.1 pg Cl/sec

 

Chlorinated pesticides,
PCBs, herbicides

400 pg/ml carrier

 

Gas purity,
Natural and refinery gas

 

PID

ELCD

NPD

Type

Selective

Selective

Selective

Destructive

No

Yes

Yes

Responds to:

Compounds ionized by UV
(aromatic hydrocarbons)

Compounds containing
halogens, S, N

N, P, heteroatoms

Linear DynamicRange

107

106 for chlorine

104

Concentration Range

pg/μl to 0.1%

pg/μl to ng/μl

pg/μl to μg/μl

Minimum Detectible

Level

Typical Applications

2 pg C/sec

 

Environmental analysis

0.5 pg/Cl/sec;

2 pg/S/sec

VOCs, PCBs in oil,
Sulfur in petroleum,
Pesticides

0.4 pg N/sec;

0.2 pg P/sec

Drugs of abuse, Nitrogen/Phosphorous
pesticides

 

AED

MSD

 

Type

Universal

Universal

 

Destructive

Yes

Yes

 

Responds to:

All elements except He

All compounds

 

Linear DynamicRange

103-104

106

 

Concentration Range

 -

10 pg/μl to 2000 ng/μl

 

Minimum Detectible

Level

Typical Applications

0.1pg – 1ng

(depending on element)

Petroleum Applications,
Warfare Agents and stable isotopes

10 pg (SIM)

 

Drug analysis, Environmental analysis,
Method development