RA-4500 Reagent Line Cleaning

RA-4500 Reagent Line Cleaning

If a contaminated reagent is used, or the reagent tubing becomes contaminated, you will need to clean the reagent tubing. 

1.  Carry out "Reagent Discharge". 



2.  Empty the reagent bottle, rinse with DI water, then add nitric acid (1+10) to the reagent bottle, and execute "Reagent Filling". 



3.  Leave the system standing in this state for at least two hours, preferrably longer. 

4.  Empty the nitric acid solution in the lines by running the “Reagent Discharge" step (same as in Step 1). 

5.  Follow the above steps with DI water in place of the nitric acid to flush out any remaining nitric acid in the line(s).

 
The above procedure is for the teflon reaction tubing.  It is recommended to replace a contaminated reagent pump tube because it is difficult to eliminate contamination from the pump tube due to the type of material it is made of.

    • Related Articles

    • Cleaning the Reagent Tubing

      If a contaminated reagent is used, or the reagent tubing becomes contaminated, you will need to clean the reagent tubing. 1.  Carry out "Reagent Discharge". 2.  Empty the reagent bottle, rinse with DI water, then add nitric acid (1+10) to the reagent ...

    • RA-4500 Cap and Bubbler Cleaning

      1.  Remove the resin screws fixing the measuring cap, and detach the cap.  The digestion side cap does not need to be removed. 2.   Once removed, there are three more screws holding the cap assembly together. Remove those screws and disassemble the ...

    • RA-5 User's Manual

      The attached PDF is the Model RA-5 User Operational and Maintenance instrument and software manual. The maintenance procedures for the RA-5 can be found in the manual.

    • RA-4300A High Blanks

      The following are the possible causes of high blank values:  Contaminated reagent or deionized water  Contaminated reagent bottle or DI bottle  Contamination inside the instrument  Rise in the concentration of mercury in the atmosphere (air)  Carry ...

    • RA-4500 Digestion Block Heater Calibration

      The attached PDF is the instructions for calibrating the heaters for the digestion block to ensure proper sample digestion.  This calibration should be performed once a year.