Prediction of Soil Clay Content and Cation Exchange Capacity Using Visible Near-Infrared Spectroscopy, Portable X-ray Fluorescence, and X-ray Diffraction Techniques

2021 ◽  
Vol 55 (8) ◽  
pp. 4629-4637
Author(s):  
Yuting Chen ◽  
Shibo Gao ◽  
Edward J. Jones ◽  
Balwant Singh
Clay Minerals ◽  
2005 ◽  
Vol 40 (1) ◽  
pp. 15-24 ◽  
Author(s):  
S. Ramirez ◽  
D. Righi ◽  
S. Petit

AbstractHydrolytic exchange was performed experimentally on four smectitic clays to evaluate the extent of clay alteration induced by this process and the associated ‘auto-transformation’ of H+ clays. Clay samples were Na-saturated and submitted to 10, 50 and 100 wetting-drying (WD) cycles and characterized after treatment using X-ray diffraction (XRD), infrared spectroscopy (FTIR) and cation exchange capacity analysis. Evidence for hydrolytic exchange was given by increasing amounts of exchangeable Mg2+ and precipitation of Na soluble salts for samples subjected to 100 WD cycles. Results indicated a decrease in the interlayer charge after 10 WD cycles but no further decrease was observed after 50 and 100 WD cycles. For one sample, XRD data indicated a decrease in the proportion of the smectite phase and a relative increase in the concentration of illite-smectite mixed layers also present in the sample. The results suggested that the reaction induces first a decrease in the layer charge and then a partial dissolution of some smectite layers.


2021 ◽  
Vol 212 ◽  
pp. 106209
Author(s):  
Fevronia T. Andreou ◽  
Barbara Barylska ◽  
Zuzanna Ciesielska ◽  
Marek Szczerba ◽  
Arkadiusz Derkowski ◽  
...  

2020 ◽  
Author(s):  
Clémence Mariage ◽  
Gilles Colinet ◽  
Valérie Genot

<p>REQUASUD network (based in Wallonia, Belgium) consists of laboratories working directly with farmers, giving them soil fertility diagnostics and advice for a good management of soils and cultures. Therefore, the laboratories analyze, among others, available nutrients. But they need more information to correctly interpret the results and give fertility advice, like the cationic exchange capacity (CEC) and the clay content. However, analyzing CEC and clay content is expensive, time-consuming and requires the use of chemicals. To overpass this problem, the near-infrared reflectance spectroscopy (NIRS) has been developed and is now used routinely in the laboratories. This method is rapid, non-destructive and allows the simultaneous estimation of soil characteristics. Nowadays, the REQUASUD NIR database performances for clay content are the followings : RPD = 2,22% for cultures and RPD = 1,72% for grasslands. This method of analysis can be used for other purposes than fertility advice.</p>


2016 ◽  
Vol 68 (4) ◽  
pp. 57 ◽  
Author(s):  
Kumiko Morihana ◽  
Masahiro Tsujimoto ◽  
Pierre Dubath ◽  
Tessei Yoshida ◽  
Kensuke Suzuki ◽  
...  

Geoderma ◽  
2020 ◽  
Vol 365 ◽  
pp. 114212 ◽  
Author(s):  
Lucas Benedet ◽  
Wilson Missina Faria ◽  
Sérgio Henrique Godinho Silva ◽  
Marcelo Mancini ◽  
Luiz Roberto Guimarães Guilherme ◽  
...  

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