I. Difference in analytical objects:
1. Analytical objects of gas chromatograph:
(1) Samples that can be vaporized, have good thermal stability and low boiling point.
(2) High boiling point, poor volatility, poor thermal stability, ionic and polymer samples can not be detected.
(3) Only about 15% to 20% of organic matter.
2, high-performance liquid chromatography analysis object:
(1) dissolved samples that can be made into a solution.
(2) Not subject to sample volatility and thermal stability.
(3) Large molecular weight, difficult to gasify, poor thermal stability, polymer and ionic samples can be detected.
(4) Widely used, accounting for about 80% to 85% of organic matter.
Two, the difference between the mobile phase:
1. Gas chromatograph mobile phase:
(1) the mobile phase is an inert gas.
(2) There is no pro-phase force between the components and the mobile phase, only with the stationary phase.
2. High performance liquid chromatography mobile phase:
(1) The mobile phase is liquid.
(2) mobile phase and components of the pro-phase force, to improve the selectivity of the column and improve the separation of the increased factors, play a large role in the separation.
(3) There are more kinds of mobile phases, and the choice is large.
(4) The choice of mobile phase polarity and pH value plays an important role in the separation.
(5) The selection of two or more liquids in different ratios as mobile phase can increase the separation selectivity.
Three, the difference in working conditions:
1, the working conditions of gas chromatograph: heating work.
2, high performance liquid chromatograph working conditions: room temperature, high pressure (liquid viscosity).
Expanded information:
Gas Chromatograph Features
(1) Large screen LCD Chinese display, while displaying the temperature control parameters and carrier gas flow or detector parameters, a variety of data at a glance.
(2) Digital flow rate display, the use of electronic mass flow meter, from the screen to accurately display the carrier gas flow rate.
(3) TCD broken gas automatic protection, the instrument breaks gas or leakage, the microcomputer system automatically disconnect the bridge current, to protect the tungsten filament from being damaged.
(4) Advanced gas flow, the instrument adopts one injection, three detector technology, better separation effect and higher sensitivity.
(5) Automatic function: after power on, the instrument automatically detects the operation status, if there is any problem, it automatically displays the fault part and fault type, and self-protects the instrument.
(6) Dedicated chromatographic workstation and chromatographic data processor
(7) Chromatographic column (imported stretcher) and three purifiers