How to choose a reasonable chromatographic configuration? We start with the conventional configuration of more than 95% of the market: hydrogen flame ionization detector commonly known as FID detector, thermal conductivity detector commonly known as TCD detector.
(a) The difference between the two detectors:
The FID detector is a mass-type universal detector, and the TCD detector is a concentration universal detector that detects different objects. The FID detector has high sensitivity to the analysis of hydrocarbons. The object of the test is basically the analysis of various organic compounds. It requires the cooperation of auxiliary gas and the current amplification circuit of the micro current amplifier. The TCD detector is especially suitable for the analysis of permanent gases. It only needs one carrier gas to work. It can be applied to the analysis of various inorganic gases and organic substances.
(ii) packed column injector and capillary column injector
The difference between the two injectors is that the packed column is analyzed for samples with less component separation. The length of the packed column is generally between 0.5 m and 15 m, usually 2 to 5 m, and the caliber is 3 mm.
Capillary column is a sample with more components and is not easy to analyze. The capillary column is generally 15 to 100 meters in length, usually 30 meters, and has a diameter of 0.53 or 0.32 mm.
Inlet: split (capillary column), splitless (packed column), six-way valve (gas injection)
Columns: There are many types of models (if you are not sure what to do, weak, medium, and strong)
Detectors: FID, TCD (two most common), ECD (strong electron negative substances such as pesticide residues), NPD (nitrogen phosphorus detector), FPD (sulfur, phosphorus)
(3) In the analysis of some conventional components, other auxiliary devices are often used, such as reformer (gas analysis); thermal analysis (low air content TVOC detection); headspace injection technology (solvent residue detection, blood) Medium alcohol content detection); valve member conversion analysis technology, etc. These detectors and injectors, as well as some auxiliary devices, constitute different configurations of chromatographic instruments for analyzing different samples;
These seemingly simple configurations can be composed of dozens of configurations according to actual needs, and the price ranges from about 20,000 to more than 100,000.
(4) The configuration of gas chromatography is generally selected according to the needs of customers to analyze the products. The instrument generally has five kinds of FID \TCD \ECD \FPD \NPD. The precision measuring instruments can be reasonably matched according to the needs and tailored for you.
The example of FID detector is generally configured on the market: double packed column + single capillary injection system + double FID, single capillary + single FID, double capillary + double FID, double capillary + double FID + double amplification board, etc. We communicate directly.
For example, from the laboratory gas chromatograph, there are no more than one hundred types and models of domestic products. The technical performance, functional characteristics, price and operating characteristics of different products vary greatly. Coupled with the analysis of the samples are strange, the purpose of analysis and requirements are not the same, for those chromatographic users who do not work long hours, experience, to be able to choose a cost-effective instrument according to their own needs, it is not an easy Things.
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