Storage solution for all combined pH glass electrodes with reference electrolyte c(KCl) = 3 mol/L, 250 mL. Long-term storage in KCl damages the glass as it results in ever-increasing response times. The patented 6.2323.000 Storage solution for combined pH glass electrodes has been developed to solve this problem. If a combined pH glass electrode is kept in the Storage solution then the performance of the glass membrane does not change regarding response time and the alkali error. If c(KCl) = 3 mol/L is additionally used as the reference electrolyte then the optimized composition of the Storage solution guarantees that the pH glass electrode is always ready for immediate use. Conditioning before the measurement is not necessary, no matter how long the electrode has been stored.
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The Metrosep a Supp 4/5 Guard/4.0 reliably protects the Metrosep a Supp 4, 5 and 7 IC anion columns against contamination from the sample or the eluent. It contains the same separation material as the Metrosep a Supp 5, is also made of PEEK, and is screwed directly onto the respective separation column with nearly no dead volume ( in.On Column Guard System in.). The guard column prolongs the service life of the analytical column, with practically no influence on its chromatographic separating efficiency. The economical price and simple handling make using the a Supp 4/5 Guard/4.0 highly recommended.
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