Impacts of water level regulation on sediment physic-chemical properties and phosphorus adsorption–desorption behaviors

2014 ◽  
Vol 70 ◽  
pp. 450-458 ◽  
Author(s):  
Xianqiang Tang ◽  
Min Wu ◽  
Qingyun Li ◽  
Li Lin ◽  
Weihua Zhao
Keyword(s):  
Water Level ◽  
Chemical Properties ◽  
Phosphorus Adsorption ◽  
Adsorption Desorption ◽  
Water Level Regulation

scholarly journals An experimental study on the effects of freeze–thaw cycles on phosphorus adsorption–desorption processes in brown soil

RSC Advances ◽  
2017 ◽  
Vol 7 (59) ◽  
pp. 37441-37446 ◽  
Author(s):  
Qingzhi Wang ◽  
Jiankun Liu ◽  
Lingqing Wang
Keyword(s):  
Experimental Study ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Phosphorus Adsorption ◽  
Soil P ◽  
Freeze Thaw ◽  
Chemical Properties Of Soils ◽  
Adsorption Desorption ◽  
Physical And Chemical ◽  
And Chemical Properties

Freeze–thaw cycles (FTCs) can strongly influence the physical and chemical properties of soils in cold regions, which can in turn affect the adsorption–desorption characteristics of phosphorus (P) in the soil.

scholarly journals Conservation Evaluation of Small-flowered Lipocarpha, Lipocarpha micrantha (Cyperaceae), in Canada

2004 ◽  
Vol 118 (2) ◽  
pp. 179
Author(s):  
Tyler W. Smith ◽  
George W. Douglas ◽  
Allan G. Harris
Keyword(s):  
British Columbia ◽  
Endangered Species ◽  
Water Level ◽  
Shoreline Development ◽  
Conservation Evaluation ◽  
Water Level Regulation

In Canada, Lipocarpha micrantha has been documented at eight locations in Quebec, Ontario, and British Columbia. Four of these populations have apparently been extirpated. The remaining populations, ranging from 120 to approximately 40000 plants, are all northern disjuncts from the main range of this species. Threats to these populations include water level regulation and shoreline development. Considering the threats to the habitat of Lipocarpha micrantha, and the small size of most of the remaining populations, it has been designated an Endangered species in Canada.

Adsorption–Desorption Characteristics of ss-DNA on 2D TpTta-COF Studied by Fluorescently Labeled Oligonucleotides

NANO ◽  
2021 ◽  
pp. 2150050
Author(s):  
Zhaoyu Han ◽  
Sen Li ◽  
Shaoxian Yin ◽  
Zhi-Qin Wang ◽  
Yanfei Cai ◽  
...  
Keyword(s):  
Chemical Properties ◽  
Kinetic Mechanism ◽  
Optical Biosensors ◽  
Desorption Kinetic ◽  
Wide Range ◽  
Potential Applications ◽  
Fluorescently Labeled Oligonucleotides ◽  
Adsorption Desorption ◽  
Physical And Chemical ◽  
And Chemical Properties

Being the newest member of the 2D materials family, 2D-nanosheet possesses many distinctive physical and chemical properties resulting in a wide range of potential applications. Recently, it was discovered that 2D COF can adsorb single-stranded DNA (ss-DNA) efficiently as well as usefully to quench fluorophores. These properties make it possible to prepare DNA-based optical biosensors using 2D COF. While practical analytical applications are being demonstrated, the fundamental understanding of binding between 2D COF and DNA in solution received relatively less attention. In this work, we carried out a systematic study to understand the adsorption and desorption kinetic, mechanism, and influencing factors of ss-DNA on the surface of 2D COF. We demonstrated that shorter DNAs are adsorbed more rapidly and bind more tightly to the surface of 2D COF. The adsorption is favored by a higher pH. The different buffer types also can affect the adsorption. In Tris-HCl solution, the adsorption reached highest efficiency. By adding the complementary DNA (cDNA), desorption of the absorbed DNA on 2D COF can be achieved. Further, desorption efficiency can also be exchanged by various surfactant in solution. These findings are important for further understanding of the interactions between DNA and COFs and for the optimization of DNA and COF-based devices and sensors.

Water level regulation affects niche use of a lake top predator, Arctic charr (Salvelinus alpinus)

Ecohydrology ◽  
2016 ◽  
Vol 10 (1) ◽  
pp. e1766 ◽  
Author(s):  
Antti P. Eloranta ◽  
Javier Sánchez‐Hernández ◽  
Per‐Arne Amundsen ◽  
Sigrid Skoglund ◽  
Jaclyn M. Brush ◽  
...  
Keyword(s):  
Water Level ◽  
Salvelinus Alpinus ◽  
Arctic Charr ◽  
Top Predator ◽  
Water Level Regulation

scholarly journals Efficient adsorption of Hg(II) from aqueous solution by N, S co-doped MnFe2O4@C magnetic nanoparticles

2020 ◽  
Vol 81 (6) ◽  
pp. 1273-1282 ◽  
Author(s):  
Hangdao Qin ◽  
Hao Cheng ◽  
Chenggui Long ◽  
Xiaogang Wu ◽  
Yanhong Chen ◽  
...  
Keyword(s):  
Magnetic Nanoparticles ◽  
Chemical Properties ◽  
Point Of Zero Charge ◽  
Simple Method ◽  
Transmission Electron ◽  
Pseudo Second Order ◽  
Enhanced Adsorption ◽  
Adsorption Desorption ◽  
Physical And Chemical ◽  
Co Doped

Abstract N, S co-doped MnFe2O4@C magnetic nanoparticles were successfully synthesized by a simple method involving the preparation of MnFe2O4 nanoparticles and subsequent pyrolysis treatment. The physical and chemical properties of MnFe2O4, MnFe2O4@C and MnFe2O4@C–NS nanoparticles were characterized by X-ray diffraction (XRD), vibrating sample magnetometry (VSM), transmission electron microscopy (TEM), N2 adsorption–desorption and the pH at the point of zero charge. Their performances in the adsorption of Hg(II) from water were investigated. The adsorption process followed pseudo-second-order kinetics and the experimental data of equilibrium isotherms fitted well with the Langmuir model. MnFe2O4@C–NS showed the highest adsorption capacity of 108.56 mg/g, increasing more than 1.7 times compared to MnFe2O4. The enhanced adsorption performance was attributed to the larger specific surface area as well as the complexation of N and S ligands on the surface. The thermodynamic parameters of ΔH°, ΔS° and ΔG° at 30 °C were −24.39 kJ/mol, −0.046 kJ/mol K and −10.45 kJ/mol, respectively, which indicated that the adsorption of Hg(II) on MnFe2O4@C–NS was exothermic and spontaneous in nature. Moreover, MnFe2O4@C–NS showed superior selectivity towards Hg(II) compared with other metal ions generally present in mercury-containing industrial wastewater.

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