Estimating sorption of monovalent acidic herbicides at different pH levels using a single sorption coefficient

2020 ◽  
Vol 76 (8) ◽  
pp. 2693-2698
Author(s):  
Claudio A Spadotto ◽  
Martin A Locke ◽  
Ronald L Bingner ◽  
Rafael Mingoti
Keyword(s):  
Sorption Coefficient ◽  
Acidic Herbicides

scholarly journals Gelatin Beads/Hemp Hurd as pH Sensitive Devices for Delivery of Eugenol as Green Pesticide

2021 ◽  
Author(s):  
Gianluca Viscusi ◽  
Giuliana Gorrasi
Keyword(s):  
Release Kinetics ◽  
Barrier Properties ◽  
Ph Sensitive ◽  
Release Behavior ◽  
Sorption Coefficient ◽  
Highly Sensitive ◽  
Mean Diameter ◽  
Ph Conditions ◽  
Kinetics Of ◽  
Hemp Hurd

AbstractIn this paper gelatin beads reinforced with natural hemp hurd have been produced as pH sensitive devices for the release of eugenol, as green pesticide. The composites beads, with a mean diameter of about 1 mm, were obtained by polymer droplet gelation in sunflower oil. Thermal properties were evaluated showing no noticeable difference after the introduction of hemp hurd. Barrier properties demonstrated an improvement of hydrophobization. The introduction of 5% w/w of hemp hurd led to a reduction of sorption coefficient of about 85% compared to unloaded gelatin beads. Besides, the diffusion coefficient decreased, introducing 5% w/w of hemp hurd, from 8.91 × 10−7 to 0.77 × 10−7 cm2/s. Swelling and dissolution phenomena of gelatin beads were studied as function of pH. The swelling of gelatin beads raised as pH increased up to 2.3 g/g, 9.1 g/g and 27.33 g/g at pH 3, 7 and 12, respectively. The dissolution rate changed from 0.034 at pH 3 to 0.077 h−1 at pH 12. Release kinetics of eugenol at different pH conditions were studied. The released eugenol after 24 h is 98%, 91%, 81 and 63% w/w (pH 3), 87%, 62%, 37 and 32 wt% (pH 7) and 81%, 68%, 60 and 52 wt% (pH 12) for unloaded gelatin beads and gelatin beads with 1%, 3 and 5% of hemp hurd, respectively. The eugenol release behavior was demonstrated to be highly sensitive to the pH release medium, which allows to tune such devices as green pesticide release systems in soils with different level of acidity/basicity.

scholarly journals INTERACTIONS OF ACIDIC HERBICIDES BENTAZON AND DICAMBA WITH ORGANOCLAYS

2004 ◽  
Vol 68 (6) ◽  
pp. 1863-1866 ◽  
Author(s):  
María José Carrizosa ◽  
William C. Koskinen ◽  
María del Carmen Hermosín
Keyword(s):  
Acidic Herbicides

scholarly journals Effect of pH on sorption kinetic process of acidic herbicides in a volcanic soil

2015 ◽  
pp. 0-0 ◽  
Author(s):  
G Palma ◽  
R Demanet ◽  
M Jorquera ◽  
M.L Mora ◽  
G Briceño ◽  
...  
Keyword(s):  
Kinetic Process ◽  
Sorption Kinetic ◽  
Volcanic Soil ◽  
Effect Of Ph ◽  
Acidic Herbicides

scholarly journals GC-MS/MS method for trace analysis of chlorophenoxy acidic herbicides from water samples

2019 ◽  
pp. 71-72
Author(s):  
Diana Maria Puiu ◽  
Roxana Scutariu ◽  
Vasile Iancu ◽  
Alina Tatarus ◽  
Luoana Florentina Pascu ◽  
...  
Keyword(s):  
Water Samples ◽  
Trace Analysis ◽  
Acidic Herbicides

QSPR modelling of the soil sorption coefficient from training sets of different sizes

2019 ◽  
Vol 30 (5) ◽  
pp. 299-311 ◽  
Author(s):  
C.J.M. Olguin ◽  
S.C. Sampaio ◽  
R.R. dos Reis ◽  
M.B. Remor ◽  
C.F.A. Olguin
Keyword(s):  
Soil Sorption ◽  
Sorption Coefficient ◽  
Training Sets

Dynamic moisture sorption and dimensional stability of furfurylated wood with low lignin content

Holzforschung ◽  
2019 ◽  
Vol 74 (1) ◽  
pp. 68-76
Author(s):  
Tiantian Yang ◽  
Erni Ma ◽  
Jinzhen Cao
Keyword(s):  
Relative Humidity ◽  
Dimensional Stability ◽  
Furfuryl Alcohol ◽  
Lignin Content ◽  
Moisture Sorption ◽  
Dimensional Change ◽  
Poplar Wood ◽  
Sorption Coefficient ◽  
Dimensional Changes ◽  
Sinusoidal Shape

AbstractDegradation of lignin occurs naturally in wood due to the influence of microorganisms or photic radiation. To improve the properties of wood with low lignin content, furfuryl alcohol (FA) at the concentration of 25% was used to modify poplar wood (Populus euramericana Cv.) after partial delignification. Moisture sorption and dimensional stability of the samples were investigated under dynamic conditions where the relative humidity (RH) was changed sinusoidally between 45% and 75% at 25°C. Both the moisture content (MC) and the tangential dimensional change varied with a sinusoidal shape similar to the RH. Hygroscopicity and hygroexpansion increased after delignification, while furfurylation led to an inverse impact by reducing MC, dimensional changes, amplitudes of MC and dimensional changes, moisture sorption coefficient (MSC), and humidity expansion coefficient (HEC). After delignification and further furfurylation, the MC and the dimensional changes were reduced by about 20%, and the maximum drop in amplitudes of MC and dimensional changes was about 30%, while the MSC and the HEC decreased by over 15%. In addition, the furfurylated wood with low lignin content exhibited lower sorption hysteresis and swelling hysteresis.

Supported liquid membrane technique for time-integrating field sampling of acidic herbicides at sub parts per billion level in natural waters

1992 ◽  
Vol 40 (12) ◽  
pp. 2413-2417 ◽  
Author(s):  
Magnus. Knutsson ◽  
Goeran. Nilve ◽  
Lennart. Mathiasson ◽  
Jan Aake. Joensson
Keyword(s):  
Natural Waters ◽  
Liquid Membrane ◽  
Supported Liquid Membrane ◽  
Field Sampling ◽  
Membrane Technique ◽  
Acidic Herbicides

scholarly journals Relative sorption coefficient: Key to tracing petroleum migration and other subsurface fluids

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
L. Zhang ◽  
Y. Wang ◽  
M.-W. Li ◽  
Q.-Z. Yin ◽  
W. Zhang
Keyword(s):  
Sedimentary Basins ◽  
Distribution Patterns ◽  
Polar Compounds ◽  
Source Rocks ◽  
Polar Molecules ◽  
Sorption Coefficient ◽  
Petroleum Migration ◽  
New Findings ◽  
Novel Concept ◽  
Incorrect Information

AbstractThe accumulation and spatial distribution of economically important petroleum in sedimentary basins are primarily controlled by its migration from source rocks through permeable carrier beds to reservoirs. Tracing petroleum migration entails the use of molecular indices established according to sorption capacities of polar molecules in migrating petroleum. However, little is known about molecular sorption capacities in natural migration systems, rendering these indices unreliable. Here, we present a new approach based on a novel concept of relative sorption coefficient for quantitatively assessing sorption capacities of polar molecules during natural petroleum migration. Using this approach, we discovered previously unrecognized “stripping” and “impeding” effects that significantly reduce the sorption capacities of polar compounds. These discoveries provide new insights into the behaviors of polar compounds and can easily explain why traditional molecular indices yield incorrect information about petroleum migration. In light of these new findings, we established new molecular indices for tracing petroleum migration. We demonstrate via case studies that the newly established indices, unlike traditional molecular indices, are reliable and effective in tracing petroleum migration. Our approach can be applied to diverse basins around the world to reveal distribution patterns of petroleum, which would decrease environmental risks of exploration by reducing unsuccessful wells.

Sorption of Water by Rubber

1938 ◽  
Vol 11 (3) ◽  
pp. 485-500
Author(s):  
R. L. Taylor ◽  
A. R. Kemp
Keyword(s):  
Dielectric Constant ◽  
Vapor Pressure ◽  
Test Specimen ◽  
Dielectric Materials ◽  
Sorption Coefficient ◽  
Electrical Instability ◽  
Specimen Temperature ◽  
Pressure Chemical ◽  
Direct Current Resistance ◽  
Current Resistance

Abstract THE presence of water is one of the principal causes of electrical instability in dielectric materials, often resulting in large variations in direct current resistance, dielectric constant, and power factor. A knowledge of the laws governing the sorption of water is therefore of considerable interest to the electrical and communications industries. The various investigators in the field of sorption of water by rubber have not reported their findings in a manner which will permit of consistent interpretation and correlation for engineering uses. Insufficient attention has been given to the effect of such factors as shape of test specimen, temperature control, variations in vapor pressure, chemical changes in the test specimen, etc. Consequently no sorption coefficient suitable for application to practical problems and no measure of the rate of sorption which will permit an adequate comparison of one material with another is now available. The purpose of this article is to describe the relation between rate of sorption and some of these variables, such as thickness of test specimen, temperature, and vapor pressure, and to show how sorption tests can be applied to certain practical problems. It is not the purpose to present a survey of the literature. The word “sorption” is used in conformity with current phraseology to mean the combined effect of adsorption and absorption.

Adsorption and degradation of four acidic herbicides in soils from southern Spain

2008 ◽  
Vol 64 (7) ◽  
pp. 703-710 ◽  
Author(s):  
Jaime Villaverde ◽  
Melanie Kah ◽  
Colin D Brown
Keyword(s):  
Southern Spain ◽  
Acidic Herbicides
Sign in / Sign up

Export Citation Format

Share Document