State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences , P.O. Box 2871, Beijing 100085, China.
Environ Sci Technol. 2013 Sep 3;47(17):9774-80. doi: 10.1021/es402136s. Epub 2013 Aug 15.
Mono- to octa-chlorinated dibenzo-p-dioxins and dibenzofurans (mono- to octa-CDD/Fs) were determined in 14 stack gas samples from two municipal solid waste incinerators and two medical waste incinerators. The total PCDD/F concentrations were 5.1-390 ng/Nm(3), and the mono- to trichlorinated homologues contributed 53.2-94.5% of the total concentrations. The homologue profiles were dominated by the MoCDF, ranged from 1.51 to 113.1 ng/Nm(3), and the proportion that each PCDF homologue group contributed to the total concentration decreased with increasing chlorination level. The toxic equivalent concentrations (I-TEQs) were 0.01-2.81 ng I-TEQ/Nm(3), with 2,3,4,7,8-PeCDF being the biggest contributor, at 30.6-60.0%. Correlations were found among the PCDD/PCDF ratios (D/F ratios), the degree of chlorination, and the TEQ. Stack gases with low I-TEQs had higher proportions of the less chlorinated homologues and lower D/F ratios, which could be attributed to the removal of the more chlorinated isomers by the air pollution control systems used by the incinerators. 2,8-DiCDF, 2,4,8-TrCDF, DiCDF, and TrCDF can be used as TEQ indicators for monitoring PCDD/Fs. 2,8-DiCDF and 2,4,8-TrCDF correlated well with the TEQ because they strongly correlated with 2,3,4,7,8-PeCDF, implying possible correlations in their formation mechanisms.
在两座城市固体废物焚烧炉和两座医疗废物焚烧炉的 14 个烟囱气体样本中，测定了一氯至八氯二苯并对二恶英和二苯并呋喃（一氯至八氯二苯并对二恶英和呋喃）。总 PCDD/F 浓度为 5.1-390ng/Nm(3)，一氯至三氯同系物占总浓度的 53.2-94.5%。同系物分布以 MoCDF 为主，范围为 1.51-113.1ng/Nm(3)，每个 PCDF 同系物组对总浓度的贡献比例随氯化程度的增加而降低。毒性等效浓度（I-TEQs）为 0.01-2.81ng I-TEQ/Nm(3)，其中 2,3,4,7,8-PeCDF 的贡献最大，为 30.6-60.0%。PCDD/PCDF 比值（D/F 比值）、氯化程度和 TEQ 之间存在相关性。I-TEQ 较低的烟囱气具有较高比例的低氯化同系物和较低的 D/F 比值，这可能归因于焚烧炉使用的空气污染控制系统去除了更氯化的异构体。2,8-二氯二苯并呋喃、2,4,8-三氯二苯并呋喃、二氯二苯并呋喃和三氯二苯并呋喃可用作监测 PCDD/Fs 的 TEQ 指标。2,8-二氯二苯并呋喃和 2,4,8-三氯二苯并呋喃与 TEQ 相关性良好，因为它们与 2,3,4,7,8-PeCDF 强烈相关，这表明它们的形成机制可能存在相关性。
