Article
Materials Science, Paper & Wood
Yun Wang, Cornellius Marcello, Neha Sawant, Abdus Salam, Said Abubakr, Dewei Qi, Kecheng Li
Summary: Organic sticky contaminants pose a significant challenge in paper recycling, causing various issues in the paper machine. This study analyzed and characterized the nature of sticky contaminants in different wastepaper grades using screening, solvent extraction, and analytical techniques. The content of stickies varied among paper grades, with higher amounts found in curb side collection wastepaper. The major components of the sticky contaminants were identified as polyvinyl acetate polymers, styrene butadiene rubber, paraffin waxes, and polyamines. The findings provide insights into the nature and behavior of stickies, with the aim of developing efficient technologies for contamination removal in paper recycling.
Article
Chemistry, Analytical
Maiko Tahara, Tsuyoshi Kawakami, Yoshiaki Ikarashi
Summary: In this study, the applicability of using hydrogen and nitrogen as alternative carrier gases in GC-MS analysis of azo compounds was examined. The results showed that both hydrogen and nitrogen can achieve sufficient peak separation of 26 primary aromatic amines under the same conditions as helium. The sensitivity of the methods using hydrogen and helium was comparable, while the sensitivity was lower when nitrogen was used. However, all carrier gases were able to quantify azo compounds below the standard value of harmful substances, indicating that hydrogen or nitrogen can be used as alternative carrier gases for GC-MS analysis of azo compounds.
JOURNAL OF AOAC INTERNATIONAL
(2023)
Article
Environmental Sciences
D. Bhatia, R. S. Kanwar, J. Singh, N. R. Sharma, R. Khandare
Summary: The present study establishes an eco-friendly and easy to scale up methodology for degrading Disperse Red 167 dye in the textile industry effluents in India. The study found that naturally occurring bacteria have the potential to treat wastewater and convert the dye into non-toxic metabolites.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2023)
Article
Polymer Science
Diyari Khaki, S. Mojtaba Amininasab, Hassan Namazi
Summary: In this study, five novel polyamides containing ether linkages, xanthene, and fluorene rings were successfully synthesized. Their solubility, thermal stability, and anti-proliferative activity were evaluated. Additionally, a polymer nanocomposite was fabricated by grafting functionalized ZnO nanoparticles onto one of the polyamides, showing enhanced antimicrobial activity. Finally, a cross-linked network structure and polyamides as absorbents were introduced for efficient dye removal from aqueous solution.
Article
Environmental Sciences
Dmitry E. Lakhmanov, Aleksandr Yu. Kozhevnikov, Sergey A. Pokryshkin, Igor P. Semiletov, Dmitry S. Kosyakov
Summary: This study represents the first investigation in 25 years of the lesser-known Siberian arctic seas, revealing the highest levels of PAHs in the Laptev Sea and a generally safe environmental situation in the region.
MARINE POLLUTION BULLETIN
(2022)
Article
Environmental Sciences
Dmitry E. Lakhmanov, Aleksandr Yu Kozhevnikov, Sergey A. Pokryshkin, Igor P. Semiletov, Dmitry S. Kosyakov
Summary: This study conducted the first research in 25 years on the least studied and hard-to-reach areas of Siberian Arctic seas. It found that the concentration of polycyclic aromatic hydrocarbons (PAHs) is comparable to the data from the 1990s, indicating a long-term persistence of pollution despite a decline in global PAH emissions. The main sources of PAHs are coal/biomass and liquid fuel combustion.
MARINE POLLUTION BULLETIN
(2022)
Article
Medicine, Legal
Satoko Ishii, Asako Fukushima, Ritsuko Katagiri, Mayumi Sakunaga, Isamu Kuribara, Takeharu Uchida, Mitsuhiro Wada, Shigeo Imai
Summary: The study used eight contaminants for a surrogate contamination test to evaluate the safety of producing recycled pulp for adult paper diapers. Based on the assessment, it was concluded that the recycling process posed no safety concerns.
REGULATORY TOXICOLOGY AND PHARMACOLOGY
(2021)
Article
Environmental Sciences
Sridhar Chinthakindi, Kurunthachalam Kannan
Summary: In this study, the concentrations of 30 primary aromatic amines (AAs), nicotine, and cotinine were measured in urine samples collected over a five-week period from 15 participants. The study found that eight AAs were detected in urine with varying frequencies, and their concentrations showed temporal variability within and between individuals. Gender and ethnicity were found to have significant effects on the concentrations of AAs.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Biotechnology & Applied Microbiology
Thaila de Mello Florencio, Leandro A. G. de Godoi, Vinicius Carvalho Rocha, Jean Maikon Santos Oliveira, Fabricio Motteran, Savia Gavazza, Karina Ferrazzoli Devienne Vicentine, Marcia Helena Rissato Zamariolli Damianovic
Summary: The study evaluated the performance of an AnSTBR reactor treating synthetic textile wastewater containing specific dye and sulfate ions, showing high removal efficiencies for dye, COD, and sulfate, but still exhibiting high toxicity to mammalian cells. Metagenomic data revealed a promising development of the inoculum in the AnSTB structure.
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
(2021)
Article
Engineering, Environmental
Siliang Wu, Xuefeng Wu, Hanke Li, Dan Li, Jianguo Zheng, Qinbao Lin, Cristina Nerin, Huaining Zhong, Ben Dong
Summary: A non-targeted method for screening the semi-volatile compounds of mechanically recycled PET for food contact materials was developed, and multiple chemometrics methods were used to analyze the data and investigate the potential influence factors. The results showed that total dissolution with comprehensive two-dimensional gas chromatography coupled with time-of-flight mass spectrometry was the most effective method. 97 compounds were classified into 4 levels based on their difference levels, with 1-Methyl-2-pyrrolidinone recognized as the primary difference indicator. The contaminant was mainly derived from residuum of non-food consumer products. The specific types of contaminants and process parameters of the recycling, such as moisture content, properties of rPET, and temperature, were found to be potential key factors affecting the presence of semi-volatile compounds in mechanically recycled rPET.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Biochemistry & Molecular Biology
Bharath Sankaralingam, Leeba Balan, Sriram Chandrasekaran, A. Muthu Selvam
Summary: Environmental pollution is a global issue, and extracting enzymes naturally to reduce pollution and protect the environment using plants like Hibiscus sabdariffa is effective in producing dyestuffs and promoting sustainable practices.
APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY
(2023)
Article
Environmental Sciences
Sridhar Chinthakindi, Kurunthachalam Kannan
Summary: Primary aromatic amines (AAs) and tobacco smoke markers were found to be prevalent in indoor house dust samples from 10 countries, with concentrations varying significantly between countries. Aniline was identified as the most abundant contaminant among AAs, while nicotine was consistently detected in all indoor samples. Concentrations of AAs in house dust were strongly correlated with nicotine levels.
ENVIRONMENT INTERNATIONAL
(2021)
Article
Chemistry, Analytical
Yelena Sapozhnikova
Summary: This study aimed to identify chemicals migrating from paper-based food packaging materials using GC-Orbitrap mass spectrometry. A total of 35 migrated chemicals were identified, including natural compounds, fatty acid ethyl esters, FDA substances, and common additives in packaging. During the migration test, levels of 23 identified chemicals significantly changed.
Article
Biochemistry & Molecular Biology
Jwahaeng Park, Kyuyeob Kim, Dayoun Ryu, Jin-Hee Whang, Jae-Hyung Mah
Summary: The aim of this study was to develop and validate a sensitive analytical method for determining 8 polycyclic aromatic hydrocarbons (PAHs) in 51 herbal medicines (HMs) using gas chromatography-tandem mass spectrometry (GC-MS/MS). Liquid-liquid extraction and florisil solid-phase extraction (SPE) were used for sample pretreatment. A new multiple reaction monitoring (MRM) method was developed and used to analyze the PAHs. Among the 459 samples, 39 samples (8.3%) did not contain any of the 8 PAHs. The total content of the 8 PAHs ranged from 0.45 μg/kg in Anemarrhenae Rhizoma to 270.94 μg/kg in Zingiberis Rhizoma. The proposed method was found to be effective for determining PAHs in HMs.
Article
Chemistry, Applied
Yu-Ting Hung, Yu-Tsung Lee, Baskaran Stephen Inbaraj, Kandi Sridhar, Bing-Huei Chen
Summary: This study aimed to determine the levels of toxic compounds PAHs and COPs in thin slices of dried pork affected by different flavorings and roasting temperature treatments. It was found that roasting temperature had a temperature-dependent increase on the levels of total COPs and PAHs in the pork slices, with soy sauce and sugar showing different effects on inhibiting or reducing the formation of these compounds.
