By chris knutsen on Friday, June 1, 2001 - 04:55 am:
I am looking for a method to detect 10 ppb levels
of N-nitrosodiethanolamine in diethanolamine. I know that this is very low and will probably entail a concentration step, but if anyone has any ideas I would really, really, really appreciate it.
Thank you in advance and everyone have a great weekend
Chris
By Anonymous on Friday, June 1, 2001 - 12:33 pm:
chemiluminescence detector? (does anyone still make one?)
By Joe Runkle on Friday, June 1, 2001 - 12:46 pm:
Chris,
I did some work on NDELA in cosmetics on LC/MS with APCI ionization. I was working at ~150 ppb and had decent S/N by monitoring the m+1 SIM at 135 m/z. 10 uL injection, 5 reps gave a mean response of ~80000 area counts (S/N ~150) RSD of ~10%. If you want method specifics, or if I can be of help, feel free to email.
Have a good weekend.
Joe
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