The following is an operation guide and troubleshooting method for thermoelectric liquid chromatography columns:

Guidelines for Operating Thermoelectric Liquid Chromatography Columns

Installation and Connection:

Ensure that the packaging of the chromatography column is intact and undamaged. After opening the packaging, inspect the surface of the chromatography column for any collisions or other damages.

According to the flow direction indicated on the chromatographic column, connect the inlet end of the column to the outlet of the injection valve through a connecting tube, and connect the outlet to the detector. The connecting pipe should be as short as possible and use a thin inner diameter to reduce column effects.

Preparation and filtration of mobile phase:

Prepare the mobile phase using chromatography pure reagents and ultrapure water or fully glassware double distilled water.

The flow is filtered through a 0.45 micron filtration membrane to remove solid particles and prevent clogging of the column head sieve plate.

Sample processing:

Dissolve the sample in mobile phase and use a pretreatment column to remove impurities with strong polarity or irreversible adsorption with column packing from the sample.

Temperature and pH control:

Set the instrument temperature according to the recommended temperature for the chromatographic column to avoid excessive or insufficient temperature affecting column efficiency.

Control the pH value of the mobile phase within the applicable range of the chromatographic column to avoid pH conditions damaging the column.

Operation and monitoring:

Start the instrument and set the appropriate flow rate and gradient elution program.

Monitor the chromatogram and adjust instrument parameters based on peak shape and resolution.

Troubleshooting methods

Column pressure increase:

Check if the mobile phase is filtered thoroughly and if there are solid particles blocking the column head sieve plate.

Check if the chromatographic column is tightly connected and if there is any leakage.

Chromatographic peak tailing:

Check whether the sample has been thoroughly processed and whether there are strong adsorption impurities that affect separation.

Check if the chromatographic column is aging and replace it with a new one if necessary.

Instrument malfunction:

Check if all components of the instrument are connected properly and if there is any looseness or damage.

Refer to the instrument manual for troubleshooting or contact professional maintenance personnel.

Following the above operation guidelines and troubleshooting methods can ensure the normal operation and accurate separation effect of the thermoelectric liquid chromatography column.