ANALYTICAL METHODS FOR THE CHARACTERIZATI ON OF SANITATION PRODUCT RESIDUES ON WORKING SURFACES IN THE MEAT INDUSTRY

Various methods of analysis to prove residual contamination of working areas in meat production companies with cleaning and disinfection age nts were examined. Due to constant monitoring of these agents the cont amination of meat products was able to be prevented or at least minimi sed already during the initial hygiene control. In solutions chemical methods based on color reaction were very vague so that a quantificati on was not possible. One of the colorimetric photometry methods for so dium hyperchlorite is considered to be a specific method and allows a continuous quantification. UV-Photometry leads only in ultra-clean wat er to an unspecific detection of all examined sanitation products up t o a concentration in ppm range. The direct on line inspection of worki ng surfaces is possible with the Screening Electron Microscopy under L ow Vacuum with Energy Dispersif X-ray spectroscopy-analysis (SEM-LV/ED X), but this method allows only the characterisation of the inspected surface and the detection of inorganic contaminations apported by the detergent. The FT-IR-ATR (Fourier Transform - Infrared - Attenuated To tal internal Reflection) method allows to characterise the residues of sanitation products and proteins on polyurethane surfaces. The OSEE ( Optically Stimulated Electron Emission) method allows to detect mug qu antites of detergent, disenfectant and organic residues per cm2 stainl ess steel and polyrethane surface. It can be concluded that the UV-Pho tometry is unsuitable for the determination of sanitation products und er the conditions of meat industry. For the on line inspection of work ing surfaces the OSEE-method allows the determination of small quantit ies and with the FT-IR-ATR-method is possible to characterise the dete cted residue.