Effects of age on the chemical structure of paleosol humic acids and fulvic acids

Calderoni, Gilberto; Schnitzer, M.

doi:10.1016/0016-7037(84)90385-5

Cited by 85 publications

(31 citation statements)

References 12 publications

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“…O método de extração de SH mais amplamente empregado e citado como o mais eficiente consiste no tratamento com solução de NaOH 0,1 a 0,5 mol L -1 (Senesi et al, 1994;Stevenson, 1994), sendo também recomendado pela Sociedade Internacional de Substâncias Húmicas (Calderoni & Schnitzer, 1984). Senesi et al (1994) alertam que extrações consecutivas e de longa duração podem modificar as SH extraídas, no entanto, estudos sistemáticos mostraram que SH extraídas com NaOH durante 24 h em presença do ar não sofreram oxidação (Tan et al, 1991).…”

Section: Introductionunclassified

Caracterização de substâncias húmicas extraídas de solos e de lodo orgânico

Dick

Gomes²,

Rosinha³

1998

Rev. Bras. Ciênc. Solo

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Section: Introductionunclassified

Caracterização de substâncias húmicas extraídas de solos e de lodo orgânico

Dick

Gomes²,

Rosinha³

1998

Rev. Bras. Ciênc. Solo

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“…In 1981, the International Humic Substances Society (IHSS) tentatively developed a method to prepare international standard humic substances samples (International Humic Substances Society 1981;Calderoni and Schnitzer 1984;Swift et al 1987). This method (IHSS method) is different from the NAGOY A (Nagoya University) method mainly in the volume of extractant employed and in the purification procedure of fulvic acids (FAs).…”

mentioning

confidence: 99%

Comparison of the composition of humic and fulvic acids prepared by the IHSS method and NAGOYA method

Watanabe

Itoh

Arai

et al. 1994

Soil Science and Plant Nutrition

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“…Similar decomposition problems were reported by Goh and Reid (1975) using N 2 -purged environments. Although anoxic environments do not seem to avoid the decomposition of SOM, the use of N 2 -purged NaOH as a SOM extracting solution has been recommended by the International Humic Substances Society (Calderoni and Schnitzer, 1984). Several other mild extracting solutions are now more commonly used, but many continue to use NaOH as the extracting solution.…”

Section: The Early Yearsmentioning

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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Effects of age on the chemical structure of paleosol humic acids and fulvic acids

Cited by 85 publications

References 12 publications

Caracterização de substâncias húmicas extraídas de solos e de lodo orgânico

Caracterização de substâncias húmicas extraídas de solos e de lodo orgânico

Comparison of the composition of humic and fulvic acids prepared by the IHSS method and NAGOYA method

Historical Perspective on the Tools That Helped Shape Soil Chemistry

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