I have found in literature about use of chloroform and thymol as preservatives for cations as well as organic acids. Therefore I would like to know is it necessary to treat the rainwater sample with preservatives and is there any negative effect on the sample?
It depends on collection method of rainwater, catchment types ( rooftop, surface run-off etc.) and use of rainwater. After knowing all, answers may be given.
You may try to use a toluene (1 drop of per litre of water), but better check your activity with ISO 5667.
Be careful about th release of formate from plastic vials especially if exposed to heat and light. Chloroform can be used, but on a longer timescale, it an be harmful for the IC columns. nevertheless, chloroform is heavier than water and so you can partially avoid to inject it by injecting the surnatant.
Thank you Stefano Polesello. Actually I am using chloroform as a preservative for rainwater samples and also analyzing using IC. Here I like to know what would be the ideal time for storage of rainwater samples before analysis to measure organic acids?
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