By PTorens on Tuesday, July 20, 2004 - 11:23 am:

I need LC/MS compatible method for analysis of Paraquat and Diquat in water. Any suggestions are welcome

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By Try the Library on Tuesday, July 20, 2004 - 05:09 pm:

Liquid chromatography-electrospray ionization isotope dilution mass spectrometry analysis of paraquat and diquat using conventional and multilayer solid-phase extraction cartridges


Yang P
JOURNAL OF CHROMATOGRAPHY A
2002, 958(1-2) Page: 25-33

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By 3 minutes on Google on Tuesday, July 20, 2004 - 05:14 pm:

Determination of diquat and paraquat in water by liquid chromatography-(electrospray ionization) mass spectrometry.
J Am Soc Mass Spectrom. 1998 Aug;9(8):830-9.

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By PTorens on Tuesday, July 20, 2004 - 05:53 pm:

To "Three minutes on Google"
I did the search but found no method which fully resolve both compounds without ion-pairing reagent (so far). I do not have access to all Journals - we are a small enviromental lab in with no library.
"The official EPA chromatographic method for Paraquat and Diquat (two herbicides) does not fully resolve the compounds. The method requires dual wavelength detection, but when one compound is 10 times greater than the other, this method gives up to a 50% error in the amount calculated"

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By 3 on Wednesday, July 21, 2004 - 04:43 pm:

Most Journal articles are available by corrisponding directly with the author. If you are going to do this by lc/ms, you do not need full resolution anyway. Ion pair agents are not as bad to work with as people think.

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By JP chem on Monday, August 9, 2004 - 01:40 am:

Analysis of paraquat and diquat by liquid chromatography/mass spectrometry (TOSOH Technical Information)
Sorry only in Japanese.

http://www2.tosoh.co.jp/hlc/hlcdb.nsf/R ... enDocument