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[Rapid qualitative analysis of indandione rodenticides by high-performance liquid chromatography coupled with ion trap mass spectrometry].

OBJECTIVE
To establish a method for the simultaneous qualitative analysis of four indandione rodenticides by high-performance liquid chromatography coupled with ion trap mass spectrometry (LC-IT/MS).


METHODS
After the indandione rodenticides in bait were extracted by acetone, and cleaned by solid-phase extraction (SPE), the liquid chromatographic separation and the MS/MS cracking were performed in the optimal instrument conditions by LC-IT/MS. Qualitative detection were carried out by the principle of mass spectrometry analysis of three qualitative ions.


RESULTS
The MS/MS fragment ions had good characteristics and stability, the cracking ways to the parent ions and fragment ions were clear. Qualitative ion pairs were m/z 339-->167 and m/z 339-->145 for diphacine, m/z 373-->201 and m/z 373-->145 for chlorophacinone, m/z 229-->145 and m/z229-->187 for valone, and m/z 229-->172 and m/z229-->145 for pindone.


CONCLUSION
This established method is simple, accurate and reliable for the qualitative analysis of indandione rodenticides.