济南市大气细颗粒物中二(口恶)英污染水平及季节变化

2021年对济南市大气PM_2.5中17种2,3,7,8氯取代二(口恶)英(PCDD/Fs)污染现状进行监测。对其异构体分布、指示性单体、季节变化规律等特征及其与常规污染物相关性进行了分析。结果表明:大气PM_2.5中PCDD/Fs浓度范围和年平均值分别为0.157~1.595 pg/m³和0.785 pg/m³,而毒性当量(以I-TEQ计)范围和年平均值分别为0.009~0.116 pg TEQ/m³和0.052 pg TEQ/m³。PCDD/Fs浓度与毒性当量季节变化特征显著,均呈现出冬季>春季>秋季>夏季的情况,可能由季节性排放源和气象条件不同导致。不同季节PCDD/Fs异构体分布模式一致,主要由高氯代(1,2,3,4,6,7,8-HpCDF、OCDD、OCDF和1,2,3,4,6,7,8-HpCDD)单体组成;而对毒性当量贡献最大的单体是2,3,4,7,8-PeCDF,其与总毒性当量具有较好的相关性。同时,PCDD/Fs浓度与SO₂、NO₂、PM_2.5等大气常规污染物呈显著正相关。这表明,大气PM_2.5中PCDD/Fs与常规污染物的生成和排放密切相关。     

Particle size effects in microbial characteristics in thermophilic anaerobic digestion of cattle manure containing copper oxide

Environmental Science and Pollution Research - Roles of bulk-, micron-, and nano-copper oxide (CuO) on methane production, microbial diversity, functions during thermophilic anaerobic digestion...     

Artificial consortia of Bacillus amyloliquefaciens HM618 and Bacillus subtilis for utilizing food waste to synthetize iturin A

Environmental Science and Pollution Research - Food waste is a cheap and abundant organic resource that can be used as a substrate for the production of the broad-spectrum antifungal compound...     

Hydrochemical characteristics,trace element sources,and health risk assessment of surface waters in the Amu Darya Basin of Uzbekistan,arid Central Asia

Environmental Science and Pollution Research - Thorough knowledge of hydrochemical characteristics and trace element concentrations in surface waters is crucial for protection of this resource,...     

Coupled effects of fly ash and calcium formate on strength development of cemented tailings backfill

Environmental Science and Pollution Research - Cemented tailings backfill (CTB) is widely adopted to ensure the safety of underground goafs and mitigate environmental risks. Fly ash (FA) and...     

Heterogeneous irradiation system: enhanced degradation of methylene blue by electron beam irradiation combined with graphite carbon nitride/carbon nanodots

Environmental Science and Pollution Research - In the present work, the degradation of methylene blue (MB) was investigated by electron beam irradiation combined with graphite carbon nitride/carbon...