Trace analysis of pesticides in water using pulsed photoacoustic technique F. Hernández-Valle, M. Navarrete, E. V. Mejía and M. Villagrán-Muniz Eur. Phys. J. Special Topics, 153 (2008) 507-510 Published online: 12 March 2008 DOI: 10.1140/epjst/e2008-00495-3