Organochlorinated Compounds in the Air at NAEO, an Eastern Background Site in China: Long-Range Atmospheric Transport versus Local Sources

Abstract

Gas and particle samples were collected by a high-volume sampler from July 2009 to March 2010 at an eastern regional background site in Ningbo and analyzed for polychlorinated biphenyls (PCBs) and organochlorine pesticides (OCPs). The total (gas + particle) air concentrations of 11 OCPs ranged from 5.34 to 417 pg/m 3 , of which HCHs, DDTs, chlordane and HCB concentrations ranged from 0.67 to 214 pg/m . Similar seasonal trends of HCH, DDT, chlordane, HCB concentrations were observed with the winter maximum. Diagnostic ratios indicate that aged technical HCH, DDT and chlordane were the major source of HCHs, DDTs and chlordane, respectively. PSCF analysis identified that northern China, southern China and Japan were major source regions of OCPs at Ningbo background site. As for PCBs, the seasonal trend was characterized with higher concentrations in summer. Those compounds were mainly influenced by the sources nearby and soil volatilization.

Characterization of PAHs and PCBs in Fly Ashes of Eighteen Coal-Fired Power Plants

“…Coal burning for power generation has been considered one of the most significant anthropogenic source of PAHs by some researchers Liu et al, 2002;Arditsoglou et al, 2004;Sahu et al, 2009). PCBs are a kind of classic POPs due to their high lipophilicity, toxicity and difficulty of degradation (Guo et al, 2014;Liu et al, 2014). Although CFPPs is a known PCBs emission sources (Jansson et al, 2011;Li et al, 2011Li et al, , 2015, the PCBs emission characteristics in CFAs from CFPPs has not been studied extensively as other POPs in China.…”

Seasonal Variation and Gas/Particle Partitioning of PCBs in Air from Central Urban Area of an Industrial Base and Coastal City -Tianjin, China

“…Polychlorinated biphenyls (PCBs) are a well-known class of ubiquitous pollutants characterized by high lipophilicity, extreme toxicity and high resistance to environmental degradation process (Breivik et al, 2002;Guo et al, 2014;Liu et al, 2014). These physiochemical properties are representative of persistent organic pollutants (POPs) and PCBs can act as their ideal marker compounds for global redistribution of POPs (Hornbuckle et al, 1993;Ockenden et al, 2003).…”

Προσδιορισμός Τοξικών Ενώσεων Στη Σκόνη Της Σαχάρας Μέσω Μεταφοράς Αερίων Μαζών Στην Ανατολική Μεσόγειο

“…Επιπλέον, έχει αναφερθεί ότι εκλύεται σε σημαντικές ποσότητες στο περιβάλλον κατά την παραγωγή τσιμέντου (Bignert et al 1998, Conesa et al 2016 Πίνακας 6.2-5). Οι τιμές των κλίσεων κυμαίνονται σε σχετικά μεγαλύτερα επίπεδα (λιγότερο αρνητικές τιμές) σε σύγκριση με άλλες μελέτες σε περισσότερο επιβαρυμένες περιοχές (Kuzu 2016, Schreitmueller & Ballschmiter 1995, Yenisoy-Karakaş et al 2012, Yeo et al 2003 εμφάνισαν παρόμοιες τιμές κλίσης m σε περιοχές υπόβαθρου (Degrendele et al 2016b, Liu et al 2014. Επίσης, από τον Πίνακα 6.2-5, παρατηρούμε ότι οι συντελεστές συσχέτισης που υπολογίστηκαν για τα OCPs παρουσιάστηκαν χαμηλοί, χωρίς ιδιαίτερες διακυμάνσεις μεταξύ των τύπων δειγμάτων (μέση τιμή συσχέτισης r: -0.190, -0.130 και -0.159, για τα δείγματα τύπου ΑΜ, ΜΙ και ΑΠ, αντίστοιχα, Πίνακας 6.2-5).…”