Article
Biochemistry & Molecular Biology
Attila Csicsor, Etelka Tombacz
Summary: Humic substances have been studied for a long time and recent research has revealed that they have antioxidant properties. The extraction method used affects not only the physico-chemical properties of the substances but also their free radical scavenging activity.
Article
Plant Sciences
Mostafa Marzi, Karim Shahbazi, Sheida Tabakhian, Hossein Kazemian
Summary: A new method was developed in this study to quantify the humic acid (HA) content in commercial fertilizers. The extraction process was optimized by adjusting factors such as contact time, extractant concentration, extractant-to-sample ratio, and number of extractions. The modified method provided efficient and accurate results for determining HA content in commercial fertilizers.
JOURNAL OF SOIL SCIENCE AND PLANT NUTRITION
(2022)
Review
Engineering, Environmental
Mengjie Ma, Tianyi An, Xinyi Zou, Mabruk Adams, Chongjun Chen
Summary: This article examines the influence of humic substances (HSs) on the performance and mechanism of the anammox process. It was found that low concentrations of HSs stimulate anammox activity, while high concentrations cause inhibition. Further research is needed to explore the microscopic mechanisms of how additional HSs affect anammox in actual wastewater.
JOURNAL OF WATER PROCESS ENGINEERING
(2023)
Article
Chemistry, Medicinal
Laura Biessy, Kirsty F. Smith, Susanna A. Wood, Annabel Tidy, Roel van Ginkel, Joel R. D. Bowater, Ian Hawes
Summary: A method was developed to feed TTX-containing microcapsules to Paphies australis for studying its accumulation and depuration in shellfish. The experiment showed that P. australis could accumulate TTX rapidly, exceeding the recommended concentration by the European Food Safety Authority. This novel method will allow for further exploration of TTX effects and transfer through food webs.
Article
Chemistry, Physical
A. Csicsor, E. Tombacz, P. Kulcsar
Summary: An increasing proportion of the population in the Western world suffers from oxidative stress related diseases. In this study, the antioxidant potential of different humic substances (HSs) samples were evaluated and compared with well-known antioxidants. Various methods were used to assess the antioxidant potential of HSs, including determining total phenolic content, applying CUPRAC and QUENCHER-CUPRAC methods, and using electron spin resonance (ESR) for characterization. The results showed that HSs samples have antioxidant properties, and the antioxidant capacity is influenced by the extraction method and source.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Chemistry, Multidisciplinary
Weiqian Liang, Shuyin Wei, Longxia Lan, Jinfeng Chen, Yingyue Zhou, Jiawei Zhao, Hao Wang, Rui Gao, Feng Zeng
Summary: Heavy metal cations are persistent inorganic pollutants in aquatic environments, posing serious threats to ecological safety and human health. The coexistence of dissolved organic matter (DOM) and microplastics (MPs) has been found to promote the adsorption of heavy metal cations, but the underlying mechanism remains unclear. This study investigated the effect of polystyrene microplastics (PSMPs) on the binding properties of Pb2+ onto humic acid (HA) in aquatic environments using spectral analysis and two-dimensional correlation (2D-COS) analysis. The findings suggest that the presence of PSMPs enhances the adsorption capacity of Pb2+ on HA through both direct and indirect mechanisms.
Article
Plant Sciences
Jianyuan Jing, Shuiqin Zhang, Liang Yuan, Yanting Li, Chengrong Chen, Bingqiang Zhao
Summary: In this study, PHA extracted from HAP was evaluated for its effects on maize seedling growth and nutrient absorption in hydroponic culture. The results showed that moderate concentrations of PHA can stimulate maize seedling growth and nutrient absorption to a similar extent as high concentrations of raw HA.
FRONTIERS IN PLANT SCIENCE
(2022)
Article
Forestry
Yu Tan, Kaijun Yang, Zhenfeng Xu, Li Zhang, Han Li, Chengming You, Bo Tan
Summary: Soil fauna play vital roles in litter humification in cold forests, with their contributions varying among species and seasons.
Article
Engineering, Electrical & Electronic
Emtinan Ouda, Nehad Yousf, Mohamed Morsy, El-Shazly M. Duraia
Summary: The light scribe technique was used to reduce graphene oxide over a flexible substrate, resulting in a humidity sensor. The sensor showed rapid response and high precision, and can be directly fabricated on flexible substrates, making it highly favorable for future wearable smart electronics.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Environmental Sciences
Yiming Fang, Hiroshi Sakai
Summary: UV-activated persulfate showed more efficient treatment of humic substances compared to hydrogen peroxide and direct irradiation, with treatment effectiveness depending on persulfate concentrations and UV wavelengths. Lower molecular weight components were more susceptible to degradation, eventually leading to effective removal of humic substances.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Chemistry, Analytical
Xiaoli Xia, Ruonan Wu, Lei Zhang, Xiangyu Chen, Yanling Yan, Jikun Yin, Jin Ren, Hongkang Li, Jinzhong Yin, Zhenjie Xue, Lanhua Yi, Tie Wang
Summary: A simple approach is reported to fabricate colorimetric aerogel sensors assembled from MOF particles via ice template-assisted methods. Compared to conventional film sensors, aerogel sensors exhibit lower limit of detection, better sensitivity at low concentrations, faster response time, and higher stability. This approach shows great potential for rapid and real-time detection of target molecules and the structural construction of various gas-sensitive materials.
ANALYTICAL CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Ivan Iurchenko, Mykola Blazheyevskiy, Vitaliy Yaremenko, Valeriy Moroz, Oleg Kryskiv
Summary: The kinetics of the oxidation reaction of Hydroxyzine hydrochloride with potassium peroxymonosulfate was studied, and it was found that the reaction followed the laws of acid-base catalysis and nucleophilic substitution. Quantitative oxidation could be achieved in 1-1.5 min at pH 8.0-8.5, with Hydroxyzine N-oxide as the only product. A scheme of the oxidation process was proposed. The determination of Hydroxyzine hydrochloride using iodometry with Oxone as the reagent was shown to be rapid, simple, accurate, selective, and cost-effective, suitable for routine analysis in quality control laboratories.
Article
Polymer Science
Sri Mulyati, Sri Aprilia, Syawaliah Muchtar, Yanna Syamsuddin, Cut Meurah Rosnelly, Muhammad Roil Bilad, Shafirah Samsuri, Noor Maizura Ismail
Summary: The potential use of tannic acid as an additive for polyvinylidene difluoride membrane was investigated. The results showed that the addition of tannic acid improved the membrane properties, leading to increased water flux and improved fouling resistance.
Article
Nanoscience & Nanotechnology
Cheng Li, Jinjin Zeng, Ding Guo, Lei Liu, Liwei Xiong, Xiaogang Luo, Zhiyuan Hu, Fengshou Wu
Summary: In this study, cobalt-doped carbon quantum dots were successfully fabricated and showed excellent fluorescence and catalytic properties, enabling the detection of Fe3+ and ascorbic acid. The dual-mode method was successfully applied in fresh fruits, showcasing the potential applications of Co-CQDs in real sample detection.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Environmental Sciences
Yujie Zhang, Shikang Wu, Peizhe Sun
Summary: Determining the conditional stability constant (Kcond) is crucial for assessing the stability of Fe(III) complexes in surface water and wastewater. This study evaluated existing methods of Kcond determination and proposed a novel UV-Vis spectroscopy method. The results showed that Fe(III)-EDTA had the highest logKcond value (7.08), followed by Fe(III)-NTA (4.67), Fe(III)-OA (4.32), Fe(III)-TTC (4.28), and Fe(III)-Kana (3.07). The method was also applied to Fe(III) complexation with humic acid (HA), yielding a logKcond value of 5.02 M-1. The proposed methodology demonstrated satisfactory measurement capability for a wide range of complexes (103 to 107 M-1). Insights into the impact of Fe(III) complexes in water matrices can be gained using this method.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)