Study on the Estimation of Source Contribution to PCDD/Fs using Chemical Mass Balance Method Based on Functional Relationship Analysis

A Chemical Mass Balance method based on Functional Relationship Analysis (Fr-CMB) was applied to estimate the contributions of sources to polychlorinated dibenzo-para-dioxins and polychlorinated dibenzofurans (PCDD/Fs) in samples of water and sediment collected from rivers in Niigata Prefecture. The assumed sources were as follows; flue gases of wasted incinerators and two banned agricultural chemicals, Chloronitrophen (CNP) and Pentachlorophenol (PCP) . To determine the classification of various compounds of PCDD/Fs and the data of agricultural chemicals to be used in the analysis, several investigations have been made. The results indicated that it was appropriate to use the ordinary classification of PCDD/Fs mainly composed of 2, 3, 7, 8-homologues, and to use the results summarized by applying k-means clustering to the data of agricultural chemicals collected until now. The results obtained by Fr-CMB seemed to be more reasonable than those by CMB8, the conventional U.S. Environmental Protection Agency (USEPA) method based on effective variance weighting.