Total Surface of Clays in Polar Liquids as a Characteristic Index

Dyal, R. S.; Hendricks, S. B.

doi:10.1097/00010694-195006000-00014

Cited by 153 publications

(77 citation statements)

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“…Water sorption and methylene blue adsorption methods have been proposed [22,23]. The method of ethylene glycol appears to be fairly successful and have been reported since 1950 [24,25]. The drawbacks associated with these methods are the fact that they require special apparatus, quite expensive and time consuming.…”

mentioning

confidence: 99%

Measurement of Surface Area of Modified Clays by Ethylene Glycol Monoethyl Ether Method

Ugochukwu¹

2017

Asian J. Chem.

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mentioning

confidence: 99%

Measurement of Surface Area of Modified Clays by Ethylene Glycol Monoethyl Ether Method

Ugochukwu¹

2017

Asian J. Chem.

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“…As amostras foram coletadas, secas ao ar, destorroadas e passadas por peneira de 2,00 mm de malha, obtendo-se a terra fina seca ao ar (TFSA) na qual foram realizadas as análises. A superfície específica foi quantificada seguindo as medidas de adsorção de moléculas polares (éter monoetílico de etileno glicol -EMEG) e da superfície específica teórica de determinados minerais de argila tomados como padrão (caulinita e montmorilonita) (DYAL; HENDRICKS, 1950;HEILMAN;CARTER;GONZALEZ, 1965). A amostra de solo (1 g) foi previamente seca em estufa de 110° C por 24 horas, seguindo para dessecador conectado a uma bomba pneumática, contendo CaCl 2 e EMEG.…”

Section: Methodsunclassified

Fósforo remanescente em solos formados sob diferentes materiais de origem em três topossequências, Pinheiral- RJ

et al. 2013

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ResumoEste trabalho teve o objetivo de avaliar os teores do fósforo remanescente e correlacioná-los com os atributos químicos, físicos e mineralógicos em horizontes de solos formados a partir de diferentes materiais de origem em três topossequências no município de Pinheiral, RJ. Foram descritos e coletadas amostras de horizontes superficiais (A) e subsuperficiais (B+C) de 14 perfis de solos sob pastagem em três topossequências (T1, T2 e T3), sendo T1 sob basalto, T2 sob muscovita-biotita-gnaisse e T3 sob gabro. Foram realizadas as análises químicas e físicas de rotina, bem como Al e Fe pelo ataque sulfúrico e fluorescência de raios X, Fed (ditionito-citrato-bicarbonato de sódio) e Feo (oxalato ácido de amônio), superfície específica da argila (SE), mineralogia da argila e óxido, e fósforo remanescente (Prem). Variações dos teores de Prem foram observadas, as quais relacionadas à natureza do material de origem, posição na paisagem e grau de desenvolvimento dos solos, o que pode ser analisado pelas variações dos atributos químicos, físicos e mineralógicos. Os teores de Prem seguiram a ordem T2 > T1 = T3 no horizonte A e da T1 > T3 e T2 ~ T1 e T3 nos horizontes B+C. Foram observadas correlações negativas entre os teores de Prem com Fe 2 O 3 (raios X) > Fed > SE > Feo nos horizontes A e com Fe 2 O 3 (ataque sulfúrico) > Fe 2 O 3 (raios X) > argila > Fed > Feo nos horizontes B+C. As análises de componentes principais e agrupamento hierárquico contribuíram para avaliação conjunta dos dados, evidenciando os atributos relacionados e as similaridades entre os solos. Palavras-chave: Adsorção de fosfato, horizontes superficiais e subsuperficiais, atributos dos solos AbstractThis work aimed to evaluate the remaining phosphorus tenors and correlate with the chemical, physical and mineralogical attributes in soils horizons developed from different parent materials in three topossequences in the municipality of Pinheiral, RJ. Were described and collected samples of surface 1 Parte da Tese de Doutorado do terceiro autor apresentada ao Curso de Pós-Graduação em Agronomia,

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“…Autoanalyzers have been available for several decades that have made this analysis easy to pursue on a routine basis. Th e surface area of particles can also be pursued by a gravimetric method, which was introduced by Dyal and Hendricks (1950), where the amount of liquid retained is weighed and correlated to the surface area of the material being tested. Th e BET autoanalyzers perform a similar task, but they measure instead the removal of N 2 (g) rather than the weight gain of the adsorbent.…”

Section: Surface Areamentioning

confidence: 99%

Historical Perspective on the Tools That Helped Shape Soil Chemistry

Schulthess

2011

Soil Science Society of America Journal

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SSSA 75 th Anniversary Paper T he tools of soil chemistry include instruments, mathematics, models, and software. Th ere is also the mind and imagination. Th roughout the history of our science, we have been shift ing away from a very labor-intensive laboratory environment, where long hours of concentration on tedious tasks was the norm. Th is change in the way we work has been accelerating, particularly since the 1950s. We are accomplishing more work but with less eff ort and more time to contemplate what the data are trying to tell us. Th e essence of our research activity has changed dramatically.Numerous laboratory tools have been used in soil chemistry during the last 200 yr, and the major changes that have occurred are highlighted here. It is hoped that the picture presented will help us decide how to better train our students for the future. By knowing how we have changed in the past and how we appear to be changing in the present, we can perhaps trace the path that we are taking, at least in the near future.Eight major themes are addressed here:1. Th e early years reviews the research environment of the 1800s up to the early 1900s. It marks the beginning years of soil chemistry that shaped many of our ideas for the decades that followed.2. Th e age of electronics covers the early part of the 1900s and the origins of the fi rst portable meters on the market.3. Spectroscopy is at the core of most of our modern methods of analysis. While the development of only a few tools are described here, the impact of spectroscopy on our current research activity cannot be understated.

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Total Surface of Clays in Polar Liquids as a Characteristic Index

Cited by 153 publications

References 0 publications

Measurement of Surface Area of Modified Clays by Ethylene Glycol Monoethyl Ether Method

Measurement of Surface Area of Modified Clays by Ethylene Glycol Monoethyl Ether Method

Fósforo remanescente em solos formados sob diferentes materiais de origem em três topossequências, Pinheiral- RJ

Historical Perspective on the Tools That Helped Shape Soil Chemistry

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