Article
Environmental Sciences
Agnieszka Krzyszczak, Michal P. Dybowski, Magdalena Konczak, Bozena Czech
Summary: In recent years, there has been significant progress in the study of thermal transformation of waste into valuable materials such as biochar. High-temperature processes can lead to the formation of toxic polycyclic aromatic hydrocarbons (PAHs). However, the pyrolysis process can also result in the formation of derivatives containing oxygen, nitrogen, or sulfur, which may have higher toxicity than parent PAHs. The bioavailability of PAHs is an important parameter in the agricultural application of carbonaceous materials.
ENVIRONMENTAL RESEARCH
(2022)
Article
Environmental Sciences
Natasha Klasios, Hannah De Frond, Ezra Miller, Meg Sedlak, Chelsea M. Rochman
Summary: The study found microplastics and other anthropogenic microparticles in bivalves from San Francisco Bay, with significant variations in abundance between different sites, and no correlation between the number of microparticles and PAH concentrations. Bivalves may be suitable as bioindicators for microplastic levels in sediment, but not in surface water.
ENVIRONMENTAL POLLUTION
(2021)
Article
Chemistry, Applied
Gizem Goker, Sezer Kiralan, Aziz Tekin, Ferruh Erdogdu
Summary: The study found that the formation of PAHs in olive pomace during drying is influenced by temperature and time, with the total PAH formation rate increasing with temperature. The activation energy and frequency factor values also increase as temperature rises.
Article
Multidisciplinary Sciences
Wei Jin, Yuan Li, Li Lu, Dong Zhang, Shanying He, Jiali Shentu, Qiwei Chai, Lei Huang
Summary: The comprehensive water quality index (CWQI) is a mathematical statistic that reflects the pollution status of rivers based on several water quality indicators. This study established a CWQI for a typical river in eastern China, using 1-year monitoring data from 20 sampling sets. The predicted CWQI for each monitoring section indicates that most sections are moderately polluted, with some sections being seriously polluted. The analysis shows that TN, n-ary sumation PAHs, and n-ary sumation n-Alks are the main factors influencing water quality, particularly due to the impact of petroleum hydrocarbons in the middle and lower reaches.
SCIENTIFIC REPORTS
(2022)
Article
Environmental Sciences
Jennifer L. A. Keir, William Papas, Adam Wawrzynczak, Rocio Aranda-Rodriguez, Jules M. Blais, Paul A. White
Summary: This study evaluated the use of silicone wristbands as passive samplers to assess firefighters' exposures to polycyclic aromatic hydrocarbons (PAHs) during firefighting. The results showed that silicone wristbands could accurately capture exposures to various PAHs, but their effectiveness may be influenced by short sampling time, high temperatures, and high turbulence.
ENVIRONMENTAL RESEARCH
(2023)
Article
Environmental Sciences
Tao Wang, Kai Xiang, Yuan Zeng, Haifeng Gu, Yufeng Guan, Shejun Chen
Summary: A study conducted in a subtropical rainforest in southern China found that forest canopies play a crucial role in scavenging airborne semi-volatile organic compounds. The study measured polycyclic aromatic hydrocarbons (PAHs) in the understory air, foliage, and litterfall, revealing spatial and temporal variations in PAH concentrations. The research provides important insights into the degradation and accumulation dynamics of PAHs in subtropical rainforests.
ENVIRONMENTAL POLLUTION
(2023)
Article
Environmental Sciences
Amber L. Kramer, Shelby Dorn, Allison Perez, Courtney Roper, Ivan A. Titaley, Kaylee Cayton, Ronald P. Cook, Paul H-Y Cheong, Staci L. Massey Simonich
Summary: This study measured the oxidative potential of 135 individual PAHs in PM2.5 and found a mismatch between DTT50 results and computed reduction potential values. The GINI equality index correlated with Delta G(rxn) values, indicating a link between electron dispersion and thermodynamic reactions in PAHs. The additive prediction model did not accurately predict the DTT consumption in the assay, suggesting a more complex toxicity model for PAHs in ambient PM2.5.
ENVIRONMENTAL POLLUTION
(2021)
Article
Environmental Sciences
Bingxin Xie, Jihong Qin, Hui Sun, Shu Wang, Xin Li
Summary: This study focuses on the distribution and leaching behavior of polycyclic aromatic hydrocarbons (PAHs) in oil-based residues of shale gas drilling cuttings. The results show that the concentration of 4-ring PAHs is the highest, and the concentration of PAHs decreases with increasing particle size of the residues. The leachate from the tested residues shows different PAH concentrations during the leaching process, with each leached PAH accounting for 1.50-3.20% of the total PAHs. The leaching characteristics of PAHs are best described by the first-order diffusion model (FRDM), with the leaching rate initially controlled by surface wash-off and then by diffusion.
Article
Environmental Sciences
Li-Ping Tao, Xue Li, Ming-Zhu Zhao, Jing-Ru Shi, Si-Qi Ji, Wen-Yuan Jiang, Qiu-Ju Liang, Yu-Hang Lei, Yi-Yao Zhou, Rong Cheng, Zhe Shi, Wenhai Deng, Jiayin Zhu, Shu-Yun Zhang
Summary: Polycyclic aromatic hydrocarbons (PAHs), particularly chrysene, have toxic effects on the liver by increasing relative liver weight and elevated serum ALT levels; the hepatotoxicity of chrysene is dependent on the aryl hydrocarbon receptor (AhR), while Nrf2 plays a crucial role in protecting against oxidative liver injury induced by chrysene.
Article
Environmental Sciences
Ulrika Eriksson, Ivan A. Titaley, Magnus Engwall, Maria Larsson
Summary: Tire granulates recovered from end-of-life tires contain a complex mixture of toxic polyaromatic compounds (PACs), which are only partially monitored. This study used chemical analysis and bioassays to determine PAC concentrations and activities in tire granulates, revealing the presence of unknown bioactive compounds that contribute significantly to the effects observed. Further investigations are needed to identify and apportion these toxicants.
Article
Environmental Sciences
Bo Fang, Mercedes A. Bravo, Hong Wang, Lulu Sheng, Wenyi Wu, Yuanke Zhou, Xuan Xi, Truls ostbye, Qin Liu
Summary: This study found that PAH exposures may delay puberty timing in girls. Specific urinary PAH metabolite concentrations were significantly associated with delayed breast development, pubic hair development, and axillary hair development.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Engineering, Environmental
Lei Zhang, Minghui Wang, Haiyang Cui, Jie Qiao, Dongsheng Guo, Biao Wang, Xiujuan Li, He Huang
Summary: The study demonstrates that humic acid (HA) or Tween80 can significantly enhance the degradation efficiency of phenanthrene (PHE) by B. subtilis ZL09-26, by jointly regulating specific cellular pathways and increasing metabolic pathways, thereby improving PHE transport, emulsification, and degradation.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Multidisciplinary Sciences
Beata Grynkiewicz-Bylina, Bozena Rakwic, Barbara Slomka-Slupik
Summary: Rubber waste is commonly used for synthetic surfaces of sport fields. However, due to restrictions on polycyclic aromatic hydrocarbons (PAHs) and other hazardous chemicals, the recycling of rubber granules may be limited. The research found that the content of PAHs in rubber granules exceeded the standard, highlighting the need for alternative applications.
SCIENTIFIC REPORTS
(2022)
Article
Environmental Sciences
Esther M. John, Jocelyn Koo, Sue A. Ingles, Theresa H. Keegan, Jenny T. Nguyen, Catherine Thomsen, Mary Beth Terry, Regina M. Santella, Khue Nguyen, Beizhan Yan
Summary: Urinary PAH exposure was found to be widespread in girls aged 6-16 years, with concentrations varying by age, race/ethnicity, body mass index percentile, as well as outdoor, indoor, and dietary sources of exposure.
ENVIRONMENTAL RESEARCH
(2022)
Article
Environmental Sciences
Shuge Sun, Wei Shi, Yu Tang, Yu Han, Xueying Du, Weishang Zhou, Weixia Zhang, Changsen Sun, Guangxu Liu
Summary: The study found that both MPs and PAHs in the marine ecosystem may have adverse effects on the haematic parameters of blood clams, including decreased total haemocyte count, changes in haematic composition, and inhibition of haemocyte phagocytosis. Exposure to MPs and PAHs may lead to toxic impacts on haematic parameters by increasing intracellular ROS contents, causing LPO and DNA damage, reducing haemocyte viability, and disrupting important molecular signaling pathways. Moreover, coexposure to MPs and PAHs resulted in more severe adverse impacts on all parameters, indicating a significant synergistic effect.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)