15 Questions 39 Answers 0 Followers
Questions related from Guilherme Sobrinho
I have noticed that this is a disputable matter: are soil texture a persistent property of soils or can Land Use and Land Cover modify it?
05 May 2017 312 14 View
It's well accepted that chloride is a conservative tracer in geochemical systems. However, in highly weathered soils the abundance of amphoteric colloids, i.e., bearing variable surface net charge...
03 March 2017 5,301 5 View
I would like to know what are the average estimates for ratios between readily available (let's say accessible by a single extraction with NH4Ac, or AgTU, or BaCl, or KCl...), and "fixed" poorly...
02 February 2017 8,099 4 View
I would like to know the methods available for soil water extraction, with special interest for soils with low water content (let's say below plant wilting point), from semiarid regions, for...
01 January 2017 644 4 View
I'd like to express the concentration of silver thiourea in aqueous solution [Ag(TU)n]+1 in terms of cmolc.L-1. The protocols for soil CTC using AgTU consider the mass of Ag for calculations and...
04 April 2015 3,223 5 View
I am interested in quantify the sorption-desorption hysteresis of 137Cs in soil samples comparing the respective isotherms.
04 April 2015 9,086 4 View
Weathering indexes are useful to estimate the intensity or the duration of a weathering process in geological materials as soils. But what are the pros and cons? What are the methodological issues...
11 November 2014 7,339 3 View
The most widely used parameter for biogeochemical modelling of radionuclides in soils is arguably the Kd. The use of some sort of Kd (e.g. kinetic, parameterized, one-point-Kd) is only possible...
11 November 2014 2,789 1 View
With special concern to multimodel selection, linear regression and theoretic-informational approaches (e.g. AICc).
05 May 2014 5,122 2 View
Just read a lot of textbooks and papers on this subject. It seems that sorption is so much more favored than desorption within specialized literature. The very definition of these concepts is of...
03 March 2014 7,456 7 View
Just read the Derivation of the Freundlich equation by Sposito (1980). Sposito cites that van Bemmelen was the first to suggest the equation for solution-to-solid sorption of ions in trace amounts.
02 February 2014 4,235 1 View
There is quite a lot of papers using this formula but they don't agree about the references. Most of them cite the works of KENG and/or UEHARA (1973; 1974; 1979; etc). Recently I had access to...
12 December 2013 4,564 4 View
Couldn't find any online.
10 October 2013 526 9 View
In theory the successive grinding and milling steps performed during the standardization of reference soil samples would make it unsuitable for partition studies (e.g. sorption-desorption,...
10 October 2013 2,254 24 View
Is there any manual method other than cone and quarter technique?
10 October 2013 9,648 5 View
