Photodegradation of tetra- and hexachlorodibenzo-p-dioxins

Polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) in water and suspended particulate matter from the Xijiang River, China

“…It was a dominant source of PCDD/Fs in Xijiang River. The high percent of OCDD in soil was described to derive from the photolysis and biodegradation of PCDD/Fs deposition in soil [24,25] or from the impurities of sodium pentachlorophenate (PCP-Na) and PCPs [26] which were widely used as pesticides of wood preservatives in China. The photochemical synthesis from PCP may also give rise to the high concentration OCDD in soil [20].…”

Effect of heavy metals on the biodegradation of dibenzofuran in liquid medium

“…Polychlorinated dibenzo-p-dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs), generally dioxins, are ubiquitous due to considerable increases in the incineration of wastes and the production of chemical compounds [1][2][3]. Combustion processes result in the major emission of dioxins into the environment.…”

Simultaneous removal of PCDD/Fs, pentachlorophenol and mercury from contaminated soil

“…The other perspective is explained via the relative chemical stability of PCDD/ F congeners. Previous studies individually investigating the degradation rates of different PCDD/F compounds in test systems indicated that highly chlorinated PCDD/F congeners (i.e., OCDD/F, HpCDD/F) show a relatively higher thermal and chemical stability, compared with low chlorinated PCDD/F congeners, and the half-life times of PCDD/F compounds commonly lessen with declining Clsubstitution level of PCDD/F compounds (Wu et al, 2005). However, the half-life times of low chlorinated PCDD/F congeners are longer than those of highly chlorinated PCDD/F congeners, as these coexist in a test system, because dechlorination continuously generates lower chlorinated PCDD/F homologues (Wu and Ng, 2008;Crosby et al, 1971).…”