Ion compositions in artificial media control the impact of humic acid on colloidal behaviour, dissolution and speciation of CuO-NP

2021 ◽  
Vol 785 ◽  
pp. 147241
Author(s):  
Jonas Fischer ◽  
Tonya Gräf ◽  
Yvonne Sakka ◽  
Christian Tessarek ◽  
Jan Köser
Keyword(s):  
Humic Acid ◽  
Media Control ◽  
The Impact

scholarly journals The impact of humic acid on metaldehyde adsorption onto powdered activated carbon in aqueous solution

RSC Advances ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 11-22 ◽  
Author(s):  
Zhuojun Li ◽  
Yuchen Yang ◽  
Ulises Jáuregui-Haza ◽  
Zhengxiao Guo ◽  
Luiza Cintra Campos
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Humic Acid ◽  
Powdered Activated Carbon ◽  
The Impact

Powdered activated carbon with abundant micropores and mesopores can effectively remove metaldehyde from aqueous solution in the presence of humic acid.

Biological and environmental media control oxide nanoparticle surface composition: the roles of biological components (proteins and amino acids), inorganic oxyanions and humic acid

2015 ◽  
Vol 2 (5) ◽  
pp. 429-439 ◽  
Author(s):  
Imali A. Mudunkotuwa ◽  
Vicki H. Grassian
Keyword(s):  
Amino Acids ◽  
Humic Acid ◽  
Surface Composition ◽  
Environmental Matrices ◽  
Environmental Media ◽  
Media Control ◽  
Nanoparticle Surface ◽  
Oxide Nanoparticle

Evolution of nanoparticle surface composition in increasingly complex biological and environmental matrices.

scholarly journals TiO2Photocatalyst Nanoparticle Separation: Flocculation in Different Matrices and Use of Powdered Activated Carbon as a Precoat in Low-Cost Fabric Filtration

2014 ◽  
Vol 2014 ◽  
pp. 1-12 ◽  
Author(s):  
Carlos F. Liriano-Jorge ◽  
Ugur Sohmen ◽  
Altan Özkan ◽  
Holger Gulyas ◽  
Ralf Otterpohl
Keyword(s):  
Activated Carbon ◽  
Humic Acid ◽  
Photocatalytic Oxidation ◽  
Low Cost ◽  
Powdered Activated Carbon ◽  
Widespread Application ◽  
Fabric Filter ◽  
Nanoparticle Separation ◽  
Ph Range ◽  
The Impact

Separation of photocatalyst nanoparticles is a problem impeding widespread application of photocatalytic oxidation. As sedimentation of photocatalyst particles is facilitated by their flocculation, the influence of common constituents of biologically pretreated wastewaters (NaCl, NaHCO3, and their combination with humic acid sodium salt) on flocculation was tested by the pipet method. Results showed that the impact of these substances on TiO2nanoparticle flocculation is rather complex and strongly affected by pH. When humic acid was present, TiO2particles did not show efficient flocculation in the neutral and slightly basic pH range. As an alternative to photocatalyst separation by sedimentation, precoat vacuum filtration with powdered activated carbon (PAC) over low-cost spunbond polypropylene fabrics was tested in the presence of two PAC types in aqueous NaCl and NaHCO3solutions as well as in biologically treated greywater and in secondary municipal effluent. PAC concentrations of≥2 g/L were required in order to achieve a retention of nearly 95% of the TiO2nanoparticles on the fabric filter when TiO2concentration was 1 g/L. Composition of the aqueous matrix and PAC type had a slight impact on precoat filtration. PAC precoat filtration represents a potential pretreatment for photocatalyst removal by micro- or ultrafiltration.

The impact of humic acid on chromium phytoextraction by aquatic macrophyte Lemna minor

Chemosphere ◽  
2016 ◽  
Vol 147 ◽  
pp. 311-317 ◽  
Author(s):  
Gabriela Kalčíková ◽  
Marija Zupančič ◽  
Anita Jemec ◽  
Andreja Žgajnar Gotvajn
Keyword(s):  
Humic Acid ◽  
Aquatic Macrophyte ◽  
Lemna Minor ◽  
The Impact

scholarly journals Influence of Antioxidants and Salinity Stress on Seed Viability Characters of Some Wheat Cultivars

1970 ◽  
pp. 13-20
Author(s):  
A. A. Kandil, A. E. Sharief ◽  
Alkhamsa K. D. Botabaah
Keyword(s):  
Ascorbic Acid ◽  
Humic Acid ◽  
Bread Wheat ◽  
Salinity Stress ◽  
Seed Viability ◽  
Germination Index ◽  
Wheat Cultivars ◽  
Germination Time ◽  
Mean Germination Time ◽  
The Impact

To explore the impact of antioxidants types and levels prim on seed germination characters of some bread wheat cultivars under salinity stress. An experiment accompanied in seed science lab during November and December 2016, to study the response of antioxidants seed prim of some bread wheat cultivars to germinate under salinity levels. The highest of final percentages of germination (96.8 %), higher percentages of germination energy (58.11 %), highest values of germination index (0.970) and a smaller amount of germination time (2.29 day) obtained from sown Misr 1 variety. The results showed that maximum of percentages of germination (91.15 %) and germination index (0.951) obtained from soaking in humic acid. The maximum percentages of energy of germination (41.21 %) and the less mean germination time (2.77 day from soaking grains in ascorbic acid compared with without antioxidants. Increasing antioxidant concentrations to 200 ppm produced the highest percentages of germination (91.61 %), energy of germination (37.63 %), germination index (0.953) and the lowermost of mean germination time (2.97 day) compared with without antioxidants and level of 100 ppm. Increasing salinity to 160 mM during germination of wheat cultivars significantly reduced percentages of germination by 18.5 %, energy of germination by 96.7 %, germination index by 18.6 % and mean germination time by 53.5 % compared with without salinity (control). Whereas, for reducing the gap between production and consumption, it could be recommended that soaking bread wheat in humic acid or ascorbic acid at 200 mM under salinity stress enhanced seed viability and advise to sown under saline new reclaimed soil.

scholarly journals ORGANIC MATTER FRACTIONS IN A QUARTZIPSAMMENT UNDER CULTIVATION OF IRRIGATED MANGO IN THE LOWER SÃO FRANCISCO VALLEY REGION, BRAZIL

2015 ◽  
Vol 39 (4) ◽  
pp. 1068-1078 ◽  
Author(s):  
José Alberto Ferreira Cardoso ◽  
Augusto Miguel Nascimento Lima ◽  
Tony Jarbas Ferreira Cunha ◽  
Marcos Sales Rodrigues ◽  
Luis Carlos Hernani ◽  
...  
Keyword(s):  
Organic Matter ◽  
Humic Acid ◽  
Soil Organic Matter ◽  
Fulvic Acid ◽  
Agricultural Production ◽  
Soil Layer ◽  
Soil Samples ◽  
C Stocks ◽  
Organic Matter Fractions ◽  
The Impact

Improper land use has lead to deterioration and depletion of natural resources, as well as a significant decline in agricultural production, due to decreased soil quality. Removal of native vegetation to make way for agricultural crops, often managed inadequately, results in soil disruption, decreased nutrient availability, and decomposition of soil organic matter, making sustainable agricultural production unviable. Thus, the aim of the present study was to evaluate the impact of growing irrigated mango (over a 20 year period) on the organic carbon (OC) stocks and on the fractions of soil organic matter (SOM) in relation to the native caatinga (xeric shrubland) vegetation in the Lower São Francisco Valley region, Brazil. The study was carried out on the Boa Esperança Farm located in Petrolina, Pernambuco, Brazil. In areas under irrigated mango and native caatinga, soil samples were collected at the 0-10 and 10-20 cm depths. After preparing the soil samples, we determined the OC stocks, carbon of humic substances (fulvic acid fractions, humic acid fractions, and humin fractions), and the light and heavy SOM fractions. Growing irrigated mango resulted in higher OC stocks; higher C stocks in the fulvic acid, humic acid, and humin fractions; and higher C stocks in the heavy and light SOM fraction in comparison to nativecaatinga, especially in the uppermost soil layer.

scholarly journals A brief history of news making in Russia

Journalism ◽  
2020 ◽  
pp. 146488492094195
Author(s):  
Ilya Yablokov ◽  
Elisabeth Schimpfössl
Keyword(s):  
Cold War ◽  
Special Issue ◽  
Media Environment ◽  
Media Control ◽  
Journalism Studies ◽  
Introductory Article ◽  
The Us ◽  
History Of ◽  
Political Intervention ◽  
The Impact

In this introductory article to our special issue on newsmaking in Russia, we provide a context for how the study of journalism evolved in Russia in contrast to Europe and the US. This brief historical overview helps make sense of the specific trajectory of journalism studies: from normative Cold War perspectives to a highly diverse and vibrant field that considers journalistic agency, the interplay of commercialisation and media control and the complexities of a rapidly changing media environment. The contributions to this special issue present nuanced approaches to self-censorship, the impact of digital technologies and political intervention.

scholarly journals Optimized coagulation of humic acid and mineral turbidity at alkaline pH using high basicity PACl

2020 ◽  
Vol 20 (6) ◽  
pp. 2324-2338 ◽  
Author(s):  
Kanika Saxena ◽  
Urmila Brighu
Keyword(s):  
Humic Acid ◽  
Organic Carbon ◽  
Alkaline Ph ◽  
Enhanced Coagulation ◽  
High Basicity ◽  
Removal Of Impurities ◽  
The Difference ◽  
The Impact ◽  
Maximum Removal ◽  
Inorganic Turbidity

Abstract In this study, the simultaneous removal of inorganic turbidity and organics was investigated at alkaline pH to avert the need for pH adjustment and overdosing. The aim was to compare the doses for conventional and enhanced coagulation and, consequently, arrive at optimized coagulation where both had synergistic maximum removal. High basicity PACl was used to coagulate simulated waters prepared by humic acid (HA) and kaolin. The removal of turbidity, total organic carbon (TOC), dissolved organic carbon (DOC) and UV254 was evaluated. The impact of varying input concentrations of HA and turbidity on doses was studied. The enhanced coagulation doses were higher than conventional ones. However, with an increase in input TOC, the difference between enhanced and conventional doses narrowed. The doses for optimized coagulation ranged from 2 to 9 mg Al/L. At optimized coagulation, the removal of TOC, DOC and UV254 varied from 30–85%, 30–89% and 73–91% respectively. Fourier transform infrared (FTIR) spectroscopy revealed the presence of Si-O-C bond. The interactions of unsaturated bonds of hydrophobic organics to inorganic clay were possibly favoured over hydrophilics. HA agglomeration reduced coagulant consumption as the input TOC increased. It was concluded that instead of a stoichiometric approach, a modified dosing approach can be applied for limiting underdosing and overdosing while ensuring maximum removal of impurities.

The impact of humic acid on the removal of bisphenol A by adsorption and ozonation

2014 ◽  
Vol 54 (4-5) ◽  
pp. 1226-1232 ◽  
Author(s):  
Bo-Ra Lim ◽  
Si-Hyun Do ◽  
Seong-Ho Hong
Keyword(s):  
Humic Acid ◽  
Bisphenol A ◽  
The Impact
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