Paul Dodson

4 Questions 11 Answers 0 Followers

Questions related from Paul Dodson

Anyone (Maybe Mark Krause) have problems derivatizing Br- for the USP pesticides list by PPO?

Dear beloved fellow chemists, I am having trouble derivatizing Inorganic Bromide by Propylene Oxide (H2SO4 catalyzed reaction). I seem to get almost no product by the EURL-SRM method. It's...

13 June 2019 7,861 4 View

Detection Limits by GC/MS/MS, SIM and MRM?

Dear fellow beloved Chemists, I am just now heavily involved in detecting organochlorine and organophosphorus pesticides by GC/MS/MS. I was just curious what the best mode of detection was...

30 April 2019 8,783 5 View

In running pesticides how many QC recovery standards do we have to spike into the original sample for % recovery?

Dear Fellow beloved chemists, Many, many questions I have with this new USP Pesticide project. In running every pesticide in the USP 561 list, how many QC recovery STDs do I need to spike 2)...

29 January 2019 2,451 0 View

Can Inorganic Bromide be run by GC/MS instead of ECD?

Dear fellow beloved chemists, I just ran the USP standards in ordered from Chem Service and did get good separation. Now on to inorganic Bromide. The method "EURL-SRM, Bromine Containing...

25 January 2019 5,843 6 View