Influence of Triton X-100 and SDBS on the Sorption of Streptomycin Sulfate from Soil

2012 ◽  
Vol 610-613 ◽  
pp. 186-189
Author(s):  
Hong Mei Zhao ◽  
Yong Li Liang ◽  
Wen Yan Zhao
Keyword(s):  
Anionic Surfactant ◽  
Contaminated Soils ◽  
Soil Washing ◽  
Distribution Coefficients ◽  
Water Soluble ◽  
Streptomycin Sulfate ◽  
Surfactant Solutions ◽  
Remediation Efficiency ◽  
Triton X ◽  
The Impact

Although surfactants have been considered in surfactant-aided soil washing systems, there is little information on the adsorption of the impact of surfactant on the adsorption of antibiotic, and this may have significant implications for the soil. In this study, Triton X-100 and SDBS were selected to study its effect on the sorption of Streptomycin sulfate from soil under equilibrium sorption. The adsorption of Streptomycin sulfate on soils in surfactant free and surfactant solutions of different critical micelle concentrations (CMCs) has been studied .The applied surfactant concentrations (X) ranged from below the (nominal) CMC to 5 times the CMC. For relatively water-soluble Streptomycin sulfate, the distribution coefficients with anionic surfactant (Kd*) deceeded those without surfactant (Kd), while non-ionic (Kd*) all exceeded those without surfactant (Kd). The Kd*/Kd ratios were used to evaluate the efficiency of surfactants and it was found that anionic surfactant is a better choice for remediation of contaminated soils whereas non-ionic surfactants leads to poor remediation efficiency.

Remediation of phenanthrene contaminated soils by nonionic–anionic surfactant washing coupled with activated carbon adsorption

2015 ◽  
Vol 72 (9) ◽  
pp. 1552-1560 ◽  
Author(s):  
Jianfei Liu ◽  
Weihong Chen
Keyword(s):  
Activated Carbon ◽  
Anionic Surfactant ◽  
Contaminated Soils ◽  
Sodium Dodecyl ◽  
Soil Washing ◽  
Mixed Surfactants ◽  
Mixed Surfactant ◽  
Activated Carbon Adsorption ◽  
The Individual ◽  
Triton X

Batch experiments were conducted to investigate the performance of nonionic–anionic mixed surfactants and their recovery through activated carbon. The solubilization capabilities of mixed surfactants toward phenanthrene (PHE) were reduced by addition of anionic surfactant to the mixed systems. Results showed that sorption of Triton X-100 (TX100) onto soil decreased with increasing mass fraction of sodium dodecyl sulfate (SDS) in the mixed surfactant solutions. Soil contaminated with PHE at 200 mg/kg was washed with different surfactant concentrations at various mass ratios of nonionic–anionic mixed surfactant. Experiments with low-concentrations of mixed surfactants revealed that removal efficiencies for PHE-contaminated soil close to the individual higher nonionic surfactant concentration can be achieved. Overall performance considering both soil washing and surfactant recovery steps is apposite when an TX100:SDS mass ratio of 8:2 at 3 g/L is used.

scholarly journals Environmental Impacts and Immobilization Mechanisms of Cadmium, Lead and Zinc in Geotechnical Composites Made from Contaminated Soil and Paper-Ash

2021 ◽  
Vol 11 (24) ◽  
pp. 11822
Author(s):  
Marija Đurić ◽  
Primož Oprčkal ◽  
Vesna Zalar Serjun ◽  
Alenka Mauko Pranjić ◽  
Janez Ščančar ◽  
...  
Keyword(s):  
Contaminated Soil ◽  
Contaminated Soils ◽  
Methodological Approach ◽  
Extraction Procedure ◽  
Water Soluble ◽  
Mineral Phases ◽  
Lead And Zinc ◽  
Remediation Efficiency ◽  
Cadmium Lead ◽  
One Year

Paper-ash is used for remediation of heavily contaminated soils with metals, but remediation efficiency after longer periods has not been reported. To gain insights into the mechanisms of immobilization of cadmium (Cd), lead (Pb), and znic (Zn), a study was performed in the laboratory experiment in uncontaminated, artificially contaminated, and remediated soils, and these soils treated with sulfate, to mimic conditions in contaminated soil from zinc smelter site. Remediation was performed by mixing contaminated soil with paper-ash to immobilize Cd, Pb, and Zn in the geotechnical composite. Partitioning of Cd, Pb, and Zn was studied over one year in seven-time intervals applying the sequential extraction procedure and complementary X-ray diffraction analyses. This methodological approach enabled us to follow the redistribution of Cd, Pb, and Zn over time, thus, to studying immobilization mechanisms and assessing the remediation efficiency and stability of newly formed mineral phases. Cd, Pb, and Zn were effectively immobilized by precipitation of insoluble hydroxides after the addition of paper-ash and by the carbonization process in insoluble carbonate minerals. After remediation, Cd, Pb, and Zn concentrations in the water-soluble fraction were well below the limiting values for inertness: Cd by 100 times, Pb by 125 times, and Zn by 10 times. Sulfate treatment did not influence the remediation efficiency. Experimental data confirmed the high remediation efficiency and stability of insoluble Cd, Pb, and Zn mineral phases in geotechnical composites.

Desorption Kinetics and Difference in Removal Enhancement of PAHs in Aged Soils by Tween 80

2014 ◽  
Vol 522-524 ◽  
pp. 257-263 ◽  
Author(s):  
He Lian Li ◽  
Rong Hui Qu ◽  
Xue Mei Han ◽  
Jia Jun Chen
Keyword(s):  
Molecular Weight ◽  
Contaminated Soils ◽  
Tween 80 ◽  
Water Soluble ◽  
Desorption Kinetics ◽  
Desorption Process ◽  
Ring Number ◽  
First Order Kinetics ◽  
Remediation Efficiency ◽  
Elovich Equation

The desorption process and desorption rate is an important factor that influence the bioavailability and remediation efficiency. PAH contaminated soils from former Beijing coking plant are remediated by Tween 80 solution. Desorption kinetics and efficiency enhancement of PAHs by Tween 80 are investigated in this paper. Results show that (1) For the relatively water-insoluble PAHs with high molecular weight, the time needed for desorption equilibrium is longer than that of relatively water-soluble PAHs with low molecular weight. The desorption kinetics of PAHs fit better to Elovich equation than to the first-order kinetics equation, especially for the PAHs with 4-6 ring numbers, which means that the desorption of PAHs from soil is an heterogeneous diffusion process; (2) Due to the severe sorption loss of Tween 80, and the difficulty in removing PAHs from aged contaminated soils, Tween 80 solution at a concentration of 5000 mg/L can only remove the PAHs with efficiencies of 11.31-18.23%. The desorption enhancement of PAHs is 7.62-14.04%, with the values of 4-6 ring number bigger than that of 2-3 ring number, which indicated that surfactant is more favorable to the desorption of PAHs with more ring numbers and thus more hydrophobic.

Serpentine-reached mining wastes as a geochemical barrier for the soil remediation under the ongoing Cu-Ni pollution in the Russian Arctic

2020 ◽  
Author(s):  
Marina Slukovskaya ◽  
Irina Kremenetskaya ◽  
Svetlana Drogobuzhskaya ◽  
Liubov Ivanova ◽  
Andrey Novikov ◽  
...  
Keyword(s):  
Organic Matter ◽  
Contaminated Soils ◽  
Plant Cover ◽  
Water Soluble ◽  
The Arctic ◽  
Soil Toxicity ◽  
Mining Wastes ◽  
Geochemical Barrier ◽  
Serpentine Minerals ◽  
The Impact

<p>The main factors for the degradation of the ecosystems in the metal-polluted territories are soil toxicity, organic matter degradation and violation of macro-element cycles. Heavily contaminated soils lose their ability to maintain sustainable vegetation, which leads to the formation of industrial barrens as the final stage of plant cover digression, where the vegetation cover is less than 10%. The deposition of metal mobile compounds into an insoluble form by alkaline sorbents is one of the most effective remediation techniques in situ. Technosol engineering is a trigger for the beginning of plant and soil cover development and the recovery succession under high pollution with metals compounds.</p><p>Field experiment of remediation using three types of serpentine mining wastes, expanded vermiculite and grass seeds mixture was laid down in 2010-2013 in the impact zone of the copper-nickel ore processing enterprise on the Kola peninsula (northern Europe) beyond the Arctic Circle at two sites with podzol and peat soil. The results obtained in 2019 showed that the immobilization effect was strengthened by high pH inherited from the alkaline wastes making Technosols a geochemical barrier. For the first 5-8 years of the experiment, the Technosol upper layers primary consisted of serpentine minerals, accumulated more than 1 g·kg-1 Ni and 0.1 g·kg<sup>-1</sup> Cu which are constantly deposited from the atmosphere as a result of the Cu-Ni enterprise activity. They also affected the underlying soil and neutralized the most toxic water-soluble and exchangeable fractions of Cu and Ni. Grass growing and litter deposition (in total 4.5-6 kg·m<sup>-2</sup>) during the experiment term led to the accumulation of organic carbon by serpentine minerals about 1.5%. Organic matter accumulation also played a significant role in metal binding by upper Technosol layers. Summarily, the remediation technology through the use of serpentine-reached mining wastes bound metals emitted by smelter into insoluble forms, reduced the toxicity of water-soluble and exchangeable fractions of heavy metals and promoted the sustainable development of plant cover.</p><p>Research was carried out with the support of the Russian Science Foundation grant 19-77-00077.</p><p> </p>

scholarly journals New Insight into the Influence of Rhamnolipid Bio-Surfactant on the Carbonate Rock/Water/Oil Interaction at Elevated Temperature

Resources ◽  
2018 ◽  
Vol 7 (4) ◽  
pp. 75
Author(s):  
Sina Rezaei Gomari ◽  
Kamal Elyasi Gomari ◽  
Meez Islam ◽  
David Hughes
Keyword(s):  
High Temperature ◽  
Elevated Temperature ◽  
Carbonate Rock ◽  
Contact Angles ◽  
Water Soluble ◽  
Water Flooding ◽  
Wettability Alteration ◽  
Surfactant Solutions ◽  
Washing Process ◽  
The Impact

Tertiary recovery is directly dependent on the alteration in wettability and interfacial tension (IFT), hence releasing the trapped oil from rock pore spaces. Bio-surfactant water flooding to mobilise residual oil in reservoirs is a new and developing prospect that can be used more often in future due to its environmentally friendly nature and economic advantages. In this work, the impact of rhamnolipids as water soluble bio-surfactant solutions on the interfacial activities of saline water and the wettability of carbonate rock are studied at elevated temperature. The effectiveness of the bio-surfactant as a rock wettability modifier is analysed in the presence of different salinities, in particular SO42− ions. The reason for the focus on SO42− is its high affinity towards calcite surfaces, and hence its ability to intervene strongly on bio-surfactant performance. To achieve the objectives of this study, the oil-wet calcite samples at elevated temperature were put through a washing process that included bio-surfactant solutions in seawater at various concentrations of sodium sulphate ions, where the measurement of the contact angles of each sample after treatment and the IFT between the oil model and the washing solutions were taken. The obtained results illustrated that bio-surfactants (rhamnolipids) with incremental concentrations of SO42− ions in sea water (up to three times higher than the original ion concentration) can lower the IFT, and assessed changing the rocks towards greater water-wettability. This study reveals that the alteration of SO42− ions had a greater impact on the wettability alteration, whereas rhamnolipids were better at reducing the IFT between the oil phase and the aqueous phase. This study also looked at temperatures of 50 °C and 70 °C, which demonstrated undesired influences on the wettability and IFT. Bio-surfactants at high temperature showed less interfacial activity, thus indicating that rhamnolipids are not active at high temperatures, while the addition of SO42− shows a continuous decrease in the contact angle and IFT measurements at high temperature.

scholarly journals Metagenomic Analysis for Evaluating Change in Bacterial Diversity in TPH-Contaminated Soil after Soil Remediation

Toxics ◽  
2021 ◽  
Vol 9 (12) ◽  
pp. 319
Author(s):  
Jin-Wook Kim ◽  
Young-Kyu Hong ◽  
Hyuck-Soo Kim ◽  
Eun-Ji Oh ◽  
Yong-Ha Park ◽  
...  
Keyword(s):  
Soil Remediation ◽  
Contaminated Soil ◽  
Contaminated Soils ◽  
Soil Bacteria ◽  
Bacterial Species ◽  
Soil Washing ◽  
Alpha Diversity ◽  
Metagenomic Analysis ◽  
Degrading Bacteria ◽  
The Impact

Soil washing and landfarming processes are widely used to remediate total petroleum hydrocarbon (TPH)-contaminated soil, but the impact of these processes on soil bacteria is not well understood. Four different states of soil (uncontaminated soil (control), TPH-contaminated soil (CS), after soil washing (SW), and landfarming (LF)) were collected from a soil remediation facility to investigate the impact of TPH and soil remediation processes on soil bacterial populations by metagenomic analysis. Results showed that TPH contamination reduced the operational taxonomic unit (OTU) number and alpha diversity of soil bacteria. Compared to SW and LF remediation techniques, LF increased more bacterial richness and diversity than SW, indicating that LF is a more effective technique for TPH remediation in terms of microbial recovery. Among different bacterial species, Proteobacteria were the most abundant in all soil groups followed by Actinobacteria, Acidobacteria, and Firmicutes. For each soil group, the distribution pattern of the Proteobacteria class was different. The most abundant classed were Alphaproteobacteria (16.56%) in uncontaminated soils, Deltaproteobacteria (34%) in TPH-contaminated soils, Betaproteobacteria (24%) in soil washing, and Gammaproteobacteria (24%) in landfarming, respectively. TPH-degrading bacteria were detected from soil washing (23%) and TPH-contaminated soils (21%) and decreased to 12% in landfarming soil. These results suggest that soil pollution can change the diversity of microbial groups and different remediation techniques have varied effective ranges for recovering bacterial communities and diversity. In conclusion, the landfarming process of TPH remediation is more advantageous than soil washing from the perspective of bacterial ecology.

Surfactant-Enhanced Washing of Aged PAH Contaminated Soils: Comparison between Nonionic Surfactant and Anionic Surfactant

2014 ◽  
Vol 522-524 ◽  
pp. 316-321 ◽  
Author(s):  
He Lian Li ◽  
Rong Hui Qu ◽  
Xue Mei Han ◽  
Jia Jun Chen
Keyword(s):  
Critical Micelle Concentration ◽  
Aqueous Solutions ◽  
Anionic Surfactant ◽  
Contaminated Soil ◽  
Contaminated Soils ◽  
Surfactant Concentration ◽  
Nonionic Surfactants ◽  
Low Concentration ◽  
Removal Efficiencies ◽  
Triton X

Nonionic surfactants Triton X-100 (TX100), Triton X-305 and anionic surfactant SDS were used to desorb PAHs from contaminated soil. The surfactant loss due to sorption/ precipitation and PAH removal efficiency by each surfactant were evaluated. Due to sorption/precipitation, the apparent critical micelle concentration (CMCsoil) values for the 3 surfactants are 1.3-3.8 times their corresponding CMC values in aqueous solutions. The maximal surfactant loss follows the order of SDS>>TX100>TX305. The anionic surfactant SDS is quite different from nonionic surfactants TX100 and TX305 in PAH removal. SDS can effectively remove 3-ring PAHs at very low concentration, but is not so efficient for 5 or 6-ring PAHs. While for nonionic surfactants TX100 and TX305, the removal efficiencies of PAHs increased with increasing surfactant concentration. Nonionic surfactants at low concentration cannot facilitate PAH desorption, but enhance the retardation of PAHs in soil. While anionic surfactant SDS enhanced PAH desorption at all the concentrations.

Genetic Variation: Impact on Folate (and Choline) Bioefficacy

2010 ◽  
Vol 80 (45) ◽  
pp. 319-329 ◽  
Author(s):  
Allyson A. West ◽  
Marie A. Caudill
Keyword(s):  
Carbon Metabolism ◽  
Genetic Variants ◽  
Plasma Homocysteine ◽  
Water Soluble ◽  
Gene Interactions ◽  
Dietary Folate ◽  
Methyl Donors ◽  
Common Genetic Variants ◽  
One Carbon Metabolism ◽  
The Impact

Folate and choline are water-soluble micronutrients that serve as methyl donors in the conversion of homocysteine to methionine. Inadequacy of these nutrients can disturb one-carbon metabolism as evidenced by alterations in circulating folate and/or plasma homocysteine. Among common genetic variants that reside in genes regulating folate absorptive and metabolic processes, homozygosity for the MTHFR 677C > T variant has consistently been shown to have robust effects on status markers. This paper will review the impact of genetic variants in folate-metabolizing genes on folate and choline bioefficacy. Nutrient-gene and gene-gene interactions will be considered along with the need to account for these genetic variants when updating dietary folate and choline recommendations.

scholarly journals Desiccation time and rainfall control gaseous carbon fluxes in an intermittent stream

2021 ◽  
Author(s):  
Maria Isabel Arce ◽  
Mia M. Bengtsson ◽  
Daniel von Schiller ◽  
Dominik Zak ◽  
Jana Täumer ◽  
...  
Keyword(s):  
Water Soluble ◽  
Intermittent Flow ◽  
Dry Period ◽  
Intermittent Stream ◽  
Aerobic Activity ◽  
Water Soluble Organic Carbon ◽  
Soluble Organic Carbon ◽  
Microbial C ◽  
Global Biogeochemical Cycles ◽  
The Impact

AbstractDroughts are recognized to impact global biogeochemical cycles. However, the implication of desiccation on in-stream carbon (C) cycling is not well understood yet. We subjected sediments from a lowland, organic rich intermittent stream to experimental desiccation over a 9-week-period to investigate temporal changes in microbial functional traits in relation to their redox requirements, carbon dioxide (CO2) and methane (CH4) fluxes and water-soluble organic carbon (WSOC). Concurrently, the implications of rewetting by simulated short rainfalls (4 and 21 mm) on gaseous C fluxes were tested. Early desiccation triggered dynamic fluxes of CO2 and CH4 with peak values of 383 and 30 mg C m−2 h−1 (mean ± SD), respectively, likely in response to enhanced aerobic mineralization and accelerated evasion. At longer desiccation, CH4 dropped abruptly, likely because of reduced abundance of anaerobic microbial traits. The CO2 fluxes ceased later, suggesting aerobic activity was constrained only by extended desiccation over time. We found that rainfall boosted fluxes of CO2, which were modulated by rainfall size and the preceding desiccation time. Desiccation also reduced the amount of WSOC and the proportion of labile compounds leaching from sediment. It remains questionable to which extent changes of the sediment C pool are influenced by respiration processes, microbial C uptake and cell lysis due to drying-rewetting cycles. We highlight that the severity of the dry period, which is controlled by its duration and the presence of precipitation events, needs detailed consideration to estimate the impact of intermittent flow on global riverine C fluxes.

scholarly journals A non-toxic, reversibly released imaging probe for oral cancer that is derived from natural compounds

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Magda Ghanim ◽  
Nicola Relitti ◽  
Gavin McManus ◽  
Stefania Butini ◽  
Andrea Cappelli ◽  
...  
Keyword(s):  
Oral Cancer ◽  
Cancer Progression ◽  
Intraoperative Imaging ◽  
Critical Role ◽  
Water Soluble ◽  
Stem Cell Marker ◽  
Squamous Cells ◽  
Tissue Identification ◽  
Tumorigenic Potential ◽  
The Impact

AbstractCD44 is emerging as an important receptor biomarker for various cancers. Amongst these is oral cancer, where surgical resection remains an essential mode of treatment. Unfortunately, surgery is frequently associated with permanent disfigurement, malnutrition, and functional comorbidities due to the difficultly of tumour removal. Optical imaging agents that can guide tumour tissue identification represent an attractive approach to minimising the impact of surgery. Here, we report the synthesis of a water-soluble fluorescent probe, namely HA-FA-HEG-OE (compound 1), that comprises components originating from natural sources: oleic acid, ferulic acid and hyaluronic acid. Compound 1 was found to be non-toxic, displayed aggregation induced emission and accumulated intracellularly in vesicles in SCC-9 oral squamous cells. The uptake of 1 was fully reversible over time. Internalization of compound 1 occurs through receptor mediated endocytosis; uniquely mediated through the CD44 receptor. Uptake is related to tumorigenic potential, with non-tumorigenic, dysplastic DOK cells and poorly tumorigenic MCF-7 cells showing only low intracellular levels and highlighting the critical role of endocytosis in cancer progression and metastasis. Together, the recognised importance of CD44 as a cancer stem cell marker in oral cancer, and the reversible, non-toxic nature of 1, makes it a promising agent for real time intraoperative imaging.

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