Dear Yahaya, you can find in the link here attached a extraction method for the determination of thymol and amitraz in honey, wax and bees.

http://www.apidologie.org/articles/apido/pdf/1992/03/Apidologie_0044-8435_1992_23_3_ART0009.pdf

The following references are devoted to the chromatographic analysis of these pesticides in different matrices;

10.1016/j.talanta.2012.05.068

10.1007/s00216-008-2003-2

10.1002/jssc.200900437

http://aoac.publisher.ingentaconnect.com/content/aoac/jaoac/2010/00000093/00000002/art00004

10.1016/j.jchromb.2008.09.024

10.1590/S1516-05722012000400013  

10.5740/jaoacint.11-207

10.1016/S0021-9673(02)00126-7

Most of the methods for the determination of thymol methods are based in GC-MS and LC-UV. Perhaps you can developed a LC-MS method for thymol analysis.

Hope its useful.

Thanks a lot Dr.Beatriz Sevilla Morán 

combine these two method to come up with a single method. Should not be that difficult. Good Luck