Hello, in our lab we've been using anion chromatography with conductimetric detection for the determination of 6 anions in tap and natural waters, namely Fluoride, Chloride, Nitrite, Nitrate, Sulphate and Phosphate. The main disadvantage we encounter is that we need 50 minutes per sample to resolve and quantify properly these 6 anions.
I've read some articles about indirect UV photometry with C18 ODS coated colums describing conditions really faster than our current method. Does anybody perform regularly any alternative chromatography under these conditions? Any other suggested approach will be really appreciated, specially if tested in "real world" conditions.
Thank you very much,
Hi Salvador,
in our lab we use a Thermofisher (formerly Dionex) ICS5000 with AS18 anion column with AG18 guard column. Detection is by conductivity. These are fast columns and at about 30 mM KOH eluent we can do a full analysis of all the anions you indicate in about 12 minutes. The column temperature does change the run time slightly and we use 30oC.
i would suggest purchasing these columns to utilise in your IC system. Google search AS18 column and you can find the specs. They are expensive though at about $3,500 Australian for the AS18 and AS18G.
hope this helps.
regards,
Brett
I should add, the ICS5000 instrument also has an anion suppressor which will greatly influence the analysis. Some for purchasing the columns please be aware that may not speed up the analysis in your system.
regards,
B
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