Cleaning For Trace Analysis

Designed to dispense Hydrofluoric Acid, MICROLIT LENTUS™ bottle top dispenser can also be used for trace analysis. The precise volume dispensing of high-purity media makes the dispenser suitable for this application.

The components of the fluid path of MICROLIT LENTUS™ have been carefully selected to only contain the highest purity materials.

To use MICROLIT LENTUS™ for trace analysis, it should be first thoroughly cleaned. Pure chemicals used for analytical purposes are used for this cleaning procedure. In order to avoid contamination of the bottle contents, the dispenser should be used without the recirculation valve. If the dispenser is used with the recirculation valve, it must be cleaned in both dispensing and recirculation modes.

We recommend the following cleaning procedure to obtain good results. However, modification can be done according to the need of the user.

  1. Mount the dispenser onto a bottle filled with Acetone, prime it and then fill it completely. Leave the piston at the upper stop and close the dispensing nozzle with the nozzle cap. Let the dispenser stand in this position for approximately 24 hours. After this, perform dispensing twice, then completely empty the dispenser and rinse it 5 times with pure water.
  2. Mount the dispenser onto a bottle filled with 20% Hydrochloric acid, prime it and then fill it completely. Leave the piston at the upper stop and close the dispensing nozzle with the nozzle cap.
  3. After approximately 24 hours contact time, perform dispensing twice and then completely fill the dispenser again.
  4. Repeat step 3 for two more times. After another approx. 24 hours contact time, empty the dispenser completely. Then, rinse it five times with pure water.
  5. Repeat the steps 2, 3 and 4 with 30% Nitric acid.
  6. Mount the dispenser onto a bottle filled with the desired dispensing medium, prime the dispenser and then fill it completely. Leave the piston at the upper stop and close the dispensing nozzle with the nozzle cap.
  7. After approximately 24 hours contact time, perform dispensing twice and then completely fill the dispenser again.
  8. Repeat step 7 for two more times. After another approx. 24 hours contact time, perform dispensing twice and then leave the piston at the lower stop.

Note: The cleaning procedure can be repeated, if the cleaning is not found sufficient.