Storage of Reference Electrodes
Contents
1. Storage of Reference Electrodes MR 9230 5 3 12 PREPARATION OF A NEW ELECTRODE Immediately upon receipt of your new reference electrode remove yellow plastic coating and store in 3M NaCl If using an RE SB please see instructions in electrode box for removing plastic coating For an RE 6 electrode use your fingernail to scrape and pull away the yellow plastic coating at the tip of the electrode It should come off as one large piece If you are using the short RE 6 electrode in an LC 44 electrochemical detector your next task is to add an O ring and bushing as illustrated in the user s manual SHORT TERM STORAGE OF AN ELECTROCHEMICAL DETECTOR If you plan to shut down your LCEC system for a few days the most critical element is the REFERENCE ELECTRODE Since the mobile phase does not contain chloride ions and the reference electrode filling solution does a concentration gradient exists and diffusion of chloride through the junction will occur This will change the reference potential of the Ag AgCl electrode To avoid this change the TIP of the reference electrode should be soaked continuously in 3 M NaCl As simple as this sounds there is a right way and a wrong way to do this The goal is to keep the frit at the bottom of the electrode wetted with NaCl solution at all times while keeping the pin of the electrode dry and clean If you seal the entire electrode in a vial or bottle solution will creep up the edge of the glass and start corr2. oding the pin If you immerse the electrode the products of corrosion will leach into the NaCl solution and then diffuse INTO your electrode It won t be a silver silver chloride electrode anymore it may be a silver silver chloride ferrous electrode which won twork well Drilla 3 16 hole z in cap S Order No MF 2079 RE 5B Reference Electrode 3 pkg 7 cm x 6 mm OD 3 pkg f f 4 cm tall plastic Order No MF 2078 RE 6 Reference Electrode centrifuge tube 3 1 cm x 6 mm OD 3 pkg RE 6 Order No MR 5275 Storage Vial I O ring 3 M NaCL 50 mL beaker f N YES m Cut 1 4 diameter hole in a plastic lid with a cork borer Reference Electrode tO LO ml Ny NO YES
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