王水
化学
环境化学
消化(炼金术)
多氯代二苯并呋喃
氧化剂
氯
多氯联苯
木质素
纤维素
持久性有机污染物
碳纤维
污染物
金属
有机化学
色谱法
材料科学
复合数
复合材料
作者
Wenjing Xie,Wenjuan Li,Pu Wang,Yanfen Hao,Bolei Chen,Ligang Hu,Thanh Wang,Qinghua Zhang,Yong Liang,Guibin Jiang
标识
DOI:10.1021/acs.est.3c03682
摘要
Dioxins, such as polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans (PCDD/Fs), are among the most toxic unintentionally produced persistent organic pollutants, and their emission is of great concern. Herein, we discovered abundant dioxin formation in soil and various organic carbon-containing matrices after digestion with aqua regia. Σ17PCDD/Fs concentrations were in the range of 66.6-142,834 pg/g dw (5.6-17,021 pg WHO2005-TEQ/g dw) in 19 soil samples after digestion with aqua regia for 6 h. Σ17PCDD/Fs concentration was significantly and positively correlated with soil organic carbon content (R2 = 0.89; p < 0.01). Compared with cellulose and lignin, humic acid served as an important organic matter component that was converted to PCDD/Fs during soil digestion. Strong oxidation and production of reactive chlorine by aqua regia may be the key factors in the formation of PCDD/Fs. The yearly emission of PCDD/Fs due to digestion with strong acids by the inspection and testing industry was estimated to be 83.8 g TEQ in China in 2021 based on the highest level, which was ∼0.9% of the total dioxin inventory in China. Great attention should be paid to unexpected dioxin formation during digestion processes considering the potential risk of release from laboratories and enterprises.
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