OP-II-3

PP-III-47meter (Shimazu Co.; TOC-5000). Qualitative/quantitative analysis of compounds inwastewater was conducted using GC/MS (HEWLETT PACKARD: HP5973MSD).RESULTS AND DISCUSSIONTable 1 Change in the reaction rate constant k [min -1 ]The results of experiment wereBLBL+TiO 2 /SiO 2GLGL+TiO 2 /SiO 2Reaction rateshown in Table1 and Figure 2. Thereconstant k [min -1 ]0.00070.00320.00070.0044was no photodegradable effect with 10090organic compounds under irradiation80by BL and GL without photocatalyst.On the other hand, photodegradationof organic compounds was observed706090%5073%4030on using TiO 2 /SiO 2 and UV lightsimultaneously. Comparing the kinds2010 17%014%BL BL+TiO2/SiO2 GL GL+TiO 2/SiO2of light, both first order reaction rateFig.2 Change in the TOC conversionconstant and TOC conversion after24 hours of above experiment showed higher performance at using GL withTiO 2 /SiO 2 than that of using BL with TiO 2 /SiO 2 . For these reasons, GL was selectedas a light source for setting of actual equipment. Furthermore, we have analyzed thewastewater using GC/MS. As shown Table 2, exsistance of organic compounds suchas aniline and benzothiazole, which were not originally found in the flux of soldering,were found in before treatment wastewater. Toxic evaluation of wastewater afterphotodegradation is also required to measure the toxicity of reaction intermediates.TO C conversion (24h)[%]Table 2. GC/MS analysis result before and after treatment of wastewater.(Software of Analysis: NAGINATA)Before treatmentChemicalsConcentration [μg/ml]Pentacosane1.34Aniline2.91Tricosane0.97Heneicosane0.95Timuvin 3280.81Heptadecane0.82Benzothiazole0.35Tetracosane1.23Octadecane1.14Eicosane0.83After treatmentChemicalsConcentration [μg/ml]PentacosaneN-nitrosomorpholineAcetophenoneBiphenylBenzothiazole0.140.490.320.110.1References[1]. K. Nakano et al. Separation and Purification Technology 34 (2004) 67-72.525