North Rhine-Westphalia State Agency for Nature, Environment and Consumer Protection (LANUV NRW), Wallneyer Str. 6, 45133, Essen, Germany.
North Rhine-Westphalia State Agency for Nature, Environment and Consumer Protection (LANUV NRW), Wallneyer Str. 6, 45133, Essen, Germany.
Chemosphere. 2021 Dec;285:131449. doi: 10.1016/j.chemosphere.2021.131449. Epub 2021 Jul 5.
Silicone rubber production using bis(2,4)-dichlorobenzoylperoxide (2,4-DCBP) as cross-linking agent was recently found to emit significant amounts of the non-Aroclor PCB congeners PCB 47, PCB 51 and PCB 68 into ambient air. Emissions were reported initially to be associated with flue gas condensate flakes deposited in the direct vicinity of the production site. These flakes were mainly composed of 2,4-dichlorobenzoic acid and were contaminated with PCBs in the range of 150-300 mg/kg. Analysis of ambient air proved that also substantial gaseous emissions of the specific PCB congeners occur. The PCB congeners PCB 47, PCB 51 and PCB 68 were also found in bulk deposition samples, bio-indicators (dandelion, kale) and soil samples in the vicinity of the production site. Substitution of 2,4-DCBP by other cross-linking agents and mitigation measures led to a significant decrease of environmental impact.
最近发现，使用双（2,4）-二氯过氧化苯甲酰（2,4-DCBP）作为交联剂生产硅橡胶会向环境空气中排放大量非多氯联苯的 PCB 同系物，如 PCB 47、PCB 51 和 PCB 68。最初报道称，排放物与沉积在生产现场附近的烟道气冷凝物薄片有关。这些薄片主要由 2,4-二氯苯甲酸组成，其中含有 150-300mg/kg 不等的多氯联苯。环境空气分析证明，也会发生特定 PCB 同系物的大量气态排放。在生产现场附近的批量沉积样本、生物指示剂（蒲公英、羽衣甘蓝）和土壤样本中也发现了 PCB 47、PCB 51 和 PCB 68。用其他交联剂替代 2,4-DCBP 并采取缓解措施可显著降低环境影响。
