Dioxin-like compound load in bulk of Chlorofen–A technical chlorobiphenyl formulation from Poland

Abstract

The results from inventory aiming to quantify production of individual chlorobiphenyl (CB) constituents and by-product impurities such as chlorodibenzo-p-dioxins (CDDs), chlorodibenzofurans (CDFs) and chloronaphthalenes (CNs) contained in the bulk of manufactured Chlorofen presented. 2,2′,3,4,4′,5,5′-Heptachlorobiphenyl (#180) is the most abundant constituent of Chlorofen and its historical production is estimated as 210 tones, and followed in decreasing order other major constituents are 2,2′,3,3′,4,4′,5′,6-/2,2′,3,4,4′,5,5′,6-OcCB (#196/203), 2,2′,3,3′,4,4′,5,5′-OcCB (#194), 2,2′,3,3′,4,5,6,6′-OcCB (#200) 2,2′,3,3′,4,5′,6-HpCB (#175), 2,2′,3,3′,4,5,5′,6-OcCB (#198) 2,2′,3,3′,4,5,5,′6′-OcCB (#199), 2,2′,3,3′,4,5′,6-HpCB (#175), 2,2′,3,4,5,5′,6-HpCB (#185) and 2,2′,4,4′,5,5′-HxCB (#153), which contributed from 150 to 53 tones, respectively. Production of non-ortho CBs was 30.277 kg with 23 kg input from 3,3′4,4′,5-PeCB (#126), while of mono-ortho CBs was 390 kg with 200 kg input from 2,3′,4,4′,5-PeCB (#118). 3,3′4,4′,5-PeCB (#126) and 3,3′,4,4′,5,5′-HxCB (#169) with 2300 and 99 g of dioxin TEQ were major dioxin-like contributors among planar CBs in this formulation. CDDs and CDFs content of the bulk of Chlorofen was estimated as 0.11 and 319 kg, respectively, and the most toxic members are 0.355 and 99.6 g TEQ. 1,2,3,4,5,6,7-HpCN (#73) with 5.3 kg (53 g TEQ) 1,2,3,4,5,6,8-HpCN (#74) with 2.9 kg (29 g TEQ) and OCN with 370 kg (37000 g TEQ) dominated among CNs in bulk of Chlorofen. An especially large contribution form OCN is due to its relatively high extrapolated REP value and absolute concentration value reported.