Polychlorinated dibenzo-p-dioxins and dibenzofurans and polychlorinated biphenyls in surface soil from the Tibetan Plateau

Abstract

Concentrations of Polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/FsThe concentrations decreased with altitudes below about 4500 m above sea level (a.s.l.), while they increased with altitudes above it. These phenomena indicate that cold condensation of PCDD/Fs and PCBs would happen above 4500 m a.s.l, on the Tibetan Plateau.

Influence of long-range atmospheric transportation (LRAT) on mono-to octa-chlorinated PCDD/Fs levels and distributions in soil around Qinghai Lake, China

“…4(b)). Few studies of PCDD/Fs in high-altitude soil samples have been conducted; however, the homolog patterns of 2,3,7,8-substituted PCDD/Fs in our samples were similar to those found in surface soil from the Tibetan Plateau, Zhangmu-Nyalam, Ny- Ålesund and Fildes Peninsula, whose major contributors were also hepta-and octa-chlorinated PCDD/F homologs (Jia et al, 2014;Tian et al, 2014). This may be affected by the components of PCDD/F emissions, for instance, higher-chlorinated (seven and eight) PCDD/ Fs accounted for 62%, 88%, 70% and 75% of total 17 PCDD/Fs released from municipal solid waste incineration, iron ore sintering, medical waste incineration and non-ferrous metal production, respectively (Jia et al, 2014).…”

“…The mean annual temperature in the Qinghai Lake basin ranges from À3.4 to 1.7 C, which may play a significant role in the atmospheric deposition and global transport of SVOCs (Lu et al, 2015;Tian et al, 2014;Yang et al, 2010). High emissions of low-chlorinated PCDD/Fs from waste incineration may be one source of PCDD/Fs around Qinghai Lake.…”

Mono- to Octachlorinated Polychlorinated Dibenzo-p-dioxin and Dibenzofuran Emissions from Sintering Plants Synergistically Controlled by the Desulfurization Process

“…The desulfurization installations operated at <200 °C, so the formation of PCDD/Fs during desulfurization was avoided . The TEQ concentrations were higher in the gypsum samples than those that have been found in soil samples − and in fly ash collected in primary magnesium smelting and coking plants. , The pollution of PCDD/Fs in gypsum cannot be ignored.…”

An overview on the organic pollution around the Qinghai-Tibet plateau: The thought-provoking situation

“…BDE-3 was the dominant congener, followed by BDE-2 and BDE-1. Tian et al (2014) speculated that cold condensation of PCBs would happen above 4500 m on the Qinghai-Tibet Plateau. Liu et al (2014a) measured concentrations of PCBs in soil from the eastern slope of the Mt.…”

“…Zhangmu-Nyalam suffered the highest occurrence of PCDD/Fs due to contributions of both local and regional sources. Tian et al (2014) reported that concentrations of PCDD/Fs congeners were quadratically related with elevation. Moreover, cold condensation of PCDD/Fs occurred above 4500 m on the Qinghai-Tibet plateau based on the concentration-elevation curve.…”