Carbamate degradation in water samples

Discussions about sample preparation: extraction, cleanup, derivatization, etc.

2 posts Page 1 of 1
In the last few months we have noticed a complete degradation of some carbamates in our in-house QC water samples upon preparation. We have found that the problem seems to be with our in-house RO water, as we pass all analytes if we make these QC samples in water that we purchased or got from a lab down the road. We have had our RO water tested for microbials, mycotoxins, a mineral screen, pH, conductivity, carbonate/bicarbonate, hardness-nothing is coming back as the problem. Has anyone ever experienced this issue in water samples? Does anyone have any other ideas what might be our problem? I appreciate any help you can offer, thanks in advance!
Do you preserve the water with the Acetate preservative listed in EPA531 before making the standards? If not that might help.

Residual chlorine is usually the problem though, and we have to check ours with a probe that measures total chlorine not just residual to make sure we are seeing it at low enough concentration.
The past is there to guide us into the future, not to dwell in.
2 posts Page 1 of 1

Who is online

In total there is 1 user online :: 0 registered, 0 hidden and 1 guest (based on users active over the past 5 minutes)
Most users ever online was 1117 on Mon Jan 31, 2022 2:50 pm

Users browsing this forum: No registered users and 1 guest

Latest Blog Posts from Separation Science

Separation Science offers free learning from the experts covering methods, applications, webinars, eSeminars, videos, tutorials for users of liquid chromatography, gas chromatography, mass spectrometry, sample preparation and related analytical techniques.

Subscribe to our eNewsletter with daily, weekly or monthly updates: Food & Beverage, Environmental, (Bio)Pharmaceutical, Bioclinical, Liquid Chromatography, Gas Chromatography and Mass Spectrometry.

Liquid Chromatography

Gas Chromatography

Mass Spectrometry