This project investigates the feasibility of environmental forensics using surface enhanced Raman spectroscopy (SERS). The SERS spectra of parathion and diazinon were measured at 785 nm by portable Raman system. The calibration curves of parathion and diazinon were characterized by the SERS peaks of 1108 cm-1and 608 cm-1, respectively. The result shows methanol can be used as absorbing solution for the sampling process and the recoveries were found to be 60.0 % for parathion and 79.5% for diazinon, respectively. For the detection of formaldehyde (HCHO) in environment, two kinds of chromogenic agents DNPH (2，4－Dinitrophenylhydrazine) and AHMT (4-amino -3-hydrazino-5- mercapto-1,2,4-triazole) were investigated. Due to the huge fluorescent of the SERS spectrum within the Raman shift range of 500 cm-1 to 1500 cm-1 , the chromogenic agent of DNPH is not suitable as the absorbing solution for HCHO. However, one of product MTT (6-mercapto-5-triazolo [4,3-b]-s-tetrazine) can be measured its SERS peak at about 1367-1375 cm-1 for the quantification of HCHO after the derivative reaction with AHMT at room temperature. With the sampling method of "NIEA A705.12C", the result shows the detection limit is 0.0032 mg/L for HCHO using AHMT as the absorbing solution.

Surface Enhanced Raman Spectroscopy (SERS)，Nanostructrued thin film，Organophosphorus Pesticides，Formaldehyde detection