Gas chromatography

 

 

 

From GL Sciences, a chromatography specialist, you can find automatic system for sample injection and accessories. You can also find Gas Detectors, "Leakdetector LD229", etc.  

 

Techniques

 

·       Pyrolysis

·       Large Volume Injections

·       Cold Injections

·       Thermal Desorption

·       On-Column Injections

·       In-Liner Derivatisation

·       DMI

·       Cold Trapping

·       Automatic Liner Exchange

·       GC Olfactometry

·       LC-GC Coupling


Optic 4 Injection System 


The Multimode Inlet for Gas Chromatography One inlet, more analytical options The patented low thermal mass design of the inlet body together with direct resistive heating provide fast linear temperature programming up to 600 °C at rates as high as 60 °C/s. In addition to standard sampling modes, the programmable inlet can operate effectively with Large Volume Injections, Pyrolysis or Thermal Desorption sample introduction. With the options for sub-ambient cooling, cryogenic trapping and automated liner exchange, OPTIC-4 is the world’s most versatile inlet for Gas Chromatography. 4th generation OPTIC OPTIC-4 is the ultimate among high performance inlet systems for gas chromatography. Designed to be installed easily onto virtually any make or model of Gas Chromatograph, OPTIC-4 offers the widest range of injection modes for a vast array of sample types.




OPTIC 3 Injection System

OPTIC3.pdf

Increase capacity of your GC system with OPTIC 3 injector! 

OPTIC 3 is a highly advanced injector with sophisticated temperature and gas flow control that 
can be used for the most demanding GC analyses. As its predecessor, OPTIC 2, the new system 
can be used for hot split/splitless, cold split/splitless and on-column injections. Facilities such as 
large volume sampling, thermal desorption and pyrolysis are standard features. 

OPTIC 3 is designed to be compatible with most popular makes and models of GC and GC-MS.
Once installed, OPTIC 3 should be fully compatible with an autosampler. 

OPTIC 3 system consists of the injector, the control unit and the dedicated control software - 
ATAS Evolution Workstation. The software graphically displays all the system parameters in a 
real time mode and gives a possibility to save the run-time data for every injection. Evolution Workstation 
can also be integrated with Agilent Chemstation. 

OPTIC 3 can be delivered in one of the four configurations. The basic model is OPTIC 3-S. 
OPTIC 3-D has an auxiliary gas control channel. OPTIC 3-SC and OPTIC 3-DC include a built-in 
cryotrap option

LINEX

Second generation DTD

New accessory for OPTIC 3 injector


Automatically changing liners is a technique that has already been used for many years. 
ATAS GL has successfully applied this approach in the Direct Thermal Desorbtion (DTD) unit. 
Now we introduce its second generation: LINer EXchanger.

Advantages are:

- Can be used on any GC, 
- DMI technique permits the analysis of trace contaminants in a wide range of 
  different matrices, 
- Uses standard 11mm septa and is compatible with the Merlin Microseal, 
- True septum purge (removes septum bleeding, reduced risk of carry over) 
- Liquid injection can be done while the automatic head is closed, 
- Uses standard OPTIC liners, 
- No liner transport adapter required, 
- Based on the OPTIC 3
 
- Little if any sample preparation is required, 
- Can be automated by FOCUS / CombiPAL, 
- Selective desorption of components of interest without pyrolyzing of the matrix, 
- Low consumable costs,

 

 

 

What is DMI:

 Ability to analyse sample by directly introducing the matrix or extract into the 
injector - 
little if any sample prep is involved 

 Liquid or dirty solid samples contained in a DMI microvial which is inserted in
an injector liner 
 Desorption from sample directly onto head of the GC capillary column  fewer 
steps involved, less opportunities for analyte losses 
 Solvents can be removed by venting under controlled conditions 
 Compounds of interest can be transferred onto the column using the lowest 
possible final temperature
 limits pyrolyzing of matrix 
 Involatiles from the matrix are kept in the microvial which is disposed of after
use
iner can be re-used

 

LINEX , an automated liner exchanger, is designed to be used for Direct (in-injector) 
Thermal Desorbtion (DTD). It can be quickly, in a matter of minutes, mounted on any 
standard OPTIC injector. Any of the standard OPTIC liners can be handled by LINEX 
either in manual or automated mode. In the automated mode liners are transported 
between the 98-position tray and injector by ATAS GL FOCUS sampling robot equippedwith a pneumatic gripping arm.

With LINEX, the multi-sample analysis sequence works in a simple way: head of the 
injector is opened and a liner containing sample is introduced. The head is closed and 
the liner is purged with carrier gas. Next, the injector is heated and the sample is 
transferred onto the column. At the end of the analysis the empty liner is moved back to the tray and the cycle is repeated.

The use of the newly developed LINEX is a most promising approach for analysis of solid and enriched gaseous samples with the fully automated OPTIC GC or OPTIC GC/MS system. There is also a possibility to apply the approach for the analysis of samples with a difficult matrixusing the so-called DMI technique. With DMI a minimum sample preparation is required.

 

Applications done on LINEX:

 Qualitative and quantitative determination of the organic wood preservative 
component N-cyclohexyl-diazeniumdioxide (HDO) in treated timber means of  direct thermal desorption
gas chromatographymass spectrometry 
(DTD
GCMS). 
 Trace-level determination of pesticides in food using difficult matrix introduction. 
 Fatty Acid Profile in vegetable oils. 
 Analysis of car exhaust. 
 Nicotine in Tobacco. 
 Chemical Analysis of Spores and Pollen. 
 Limonene in shampoo. 
 Benzene and toluene in crude oil. 
 Caffeine in instant coffee.











FOCUS - Robotic Sample Processor

Best for automatic preparation of samples for GC analysis!


 


FOCUS is compatible with most GC and GC-MS systems and can automate the following:

Direct Thermal Desorbtion (DTD) 
SPME Automatic liquid-liquid extraction 
On-line sample derivatisation Large and standard auto injection volumes
Program for different sampling protocols Static Headspace 

FOCUS Specification
Specification in Liquid Mode

Syringe sizes:

Wide range of syringes

Injection Speed:

0.01 µl/sec - 500 µl/sec

Sample capacity:

up to 600 1-ml micro vials
up to 297 2-ml standard vials
up to 96 10-ml or 20-ml vials
up to 4 deep well microplates
up to 6 standard microplates
optional Cooled Tray holders available

Syringe cleaning:

Standard with Wash Station for 2 different solvents, but it can be more.

Specifications in SPME Mode

SPME fiber holder for standard SPMEfibers

Variable vial penetration depth for headspace or liquid extractions

Samples can be agitated and / or heated during extraction

 

 

Sample capacity:

up to 297 2-ml standard vials
up to 96 10-ml or 20-ml vials
optional Cooled Trayholders available

Fiber cleaning:

Optional Fiber cleaning station
25°C – 350°C, inert gas purging.

Incubator oven:

6 heated vial positions for 2-ml/10-ml/20-ml vials

Incubation temperature:

25°C – 200°C selectable 1°C increments

Agitation:

Interval shaking 100 rpm – 750 rpm
prior or during sample extraction

Steps of  FOCUS SPME Cycle

Fiber adsorption
in 2-ml/10-ml or 20-ml vial

Variable vial penetration for
different types of extractions
Fiber desorption in the
GC injector

 

Specifications in Headspace Mode

Syringe sizes:

1.0 ml
2.5 ml
5.0 ml

Injection volume range:

0.1 ml – 1.0 ml
0.25 ml – 2.5 ml
0.5 ml – 5.0 ml

Injection speed:

0.01 µl/sec - 1000 µl/sec

Sample capacity:

up to 297 2-ml standard vials
up to 96 10-ml or 20ml vials
optional Cooled Trayholders available

Syringe cleaning:

Inert gas purging of heated syringe

Heated syringe:

25°C – 150°C selectable 1°C increments

Incubator oven:

6 heated vial positions for 2-ml/10-ml/20-ml vials

Incubation temperature:

25°C – 200°C in 1°C increments

Agitation:

Selectable interval shaking 100 rpm – 750 rpm