부유물질 포함 물시료의 총 유기탄소(TOC) 분석절차 개선에 대한 연구

In this study, we investigated analytical procedures for obtaining accurate and reliable total organic carbon (TOC) measurements in particle-containing water samples. Most TOC values obtained at several laboratories for cellulose particle-containing samples (20~100 μm, 10~100 mg-C/L) did not meet the quality control cri-teria (i.e., 80%). Therefore, in this study, the influence of suspended particles (particle size, and concentration) on TOC analytical procedures (sample injection, purging time, washing, dilution etc.) and TOC measurements (accuracy and precision) was evaluated specifically for cellulose particle-containing water samples, and various other environmental samples (soil, road sediment, sewage sludge). Results of the washing experiment showed that about twice the washing volume was required, compared with that required in conventional TOC analysis for dissolved samples, for the removal of residual particles in the apparatus after the measurement. Also, a normal injection method was preferred for sample injection and an appropriate sample preparation method (without dilution) and proper concentration ranges (10~100 mg-C/L) are suggested based on the results of our study.