Any recommendation for 'soil database' that provide information about global soil properties?

More Eliezer Khaling's questions See All

Could you recommend methods for analyzing soil extracts from the rhizosphere for organic compounds, including secondary metabolites?

Additionally, could you suggest technical analytical instruments suitable for this purpose?

11 March 2024 7,579 2 View

1H NMR to determine glycerol to glycerol carbonate is possible in a 300 T equipment?

I'm studying the transcarbonation reaction of glycerol to glycerol carbonate. I have read good papers about this issue, but the problem is that the glycerol -CH- peak in my spectra is absent. The...

22 September 2022 4,939 2 View

Has anyone used Arduino to control a fixed bed reactor?

I'm building a module to study a fixed bed reactor. I have to use it to control the outlet pH, the reactor inlet and outlet temperatures, the spectrophotometer outlet data, and the inlet reactant...

03 April 2022 7,082 2 View

Are there specific adsorption / desorption kinetic equations for drugs delivery? Those ones for chemical kinetics could be used? References ?

I have been using chemical kinetics equations (1st order, 2nd, order, etc) for modeling of adsorption /desorption of drugs on molecular sieves. Is this a correct or I need specific equations? I...

07 October 2020 7,898 11 View

How to quantify and stratify the volume and specific surface area of submicro-, micro-, meso- and macropores in a porous solid?

Is it possible to quantify and stratify the kinds of pores (volume and specific surface area)? Only N2 physisorption is enough? Is there another technique to help this? Physically are there other...

04 August 2020 9,393 3 View

What's the effect of MgO impregnation over activated carbono on sugar clarification?

I'm trying to clarify sugar modifying activated carbon with diferentes oxides.

17 May 2019 3,940 2 View

I need to obtain an equation for calculation of pure urea in liquid phase. Has someone a refrence? Or a thermodynamic equation for this?

I'm developing a work that needs the density of pure liquid urea. It's liquid when the temperature is higher than 134 oC, but I didn't find references for this property.

29 November 2018 4,893 2 View

I need to prepare ZSM-12 and Beta zeólitas with TEABr, but the OH-/SiO2 ratio is very low and sílica fumed doesn't solubilize. What can I do?

Cannot synthesize these zeolites at low OH/SiO2 ratio.

10 October 2018 8,842 3 View

Are there specific models for adsorption / desorption of drugs in porous solids?

In studies of adsorption / desorption kinetics of drugs in zeolites, the kinetic models of 1st and 2nd order as in chemical kinetics give very similar results. Are there specific models for the...

29 May 2018 1,238 6 View

How to differenciate Bronsted acid sites in "nests" from isolated ones?

Is there a characterization technique to differentiate acidic sites of bronsted that accumulate in "nests" of those that are isolated? If so, how to differentiate and quantify them?

11 April 2018 7,081 2 View

How to assess the osmotic power of a substance?

Hello, I suspect that a molecule I am using is causing bacteria to experience osmotic shock. What chemical properties should I look for to compare this capability with those of other substances?...

06 August 2024 977 1 View

How to check pH of a high strength hydrogel?

We are working on biopolymeric hydrogels. Our system is highly viscous and sticky, and the gel formed are high in strength. We are unable to use pH electrode and pH strip. Please suggest an easy...

30 July 2024 942 2 View

EDTA buffer solution?

Hello everyone! How can i prepare EDTA buffer solution (pH 8.2) to determine GSH levels? Thank you in advance.

29 July 2024 4,374 1 View

Whether i can preserve leaves samples in 2.5% glutaraldehyde in 0.05 M phosphate buffer, pH 7 for coming several weeks for further LM study ?

I want to preserve the sample leaves for the LM study of the stomata and conidia analysis. Whether 2.5% glutaraldehyde in 0.05 M phosphate buffer with pH 7 can be applied for preservation.

29 July 2024 8,560 0 View

How can I regenerate a SCX column modified with Sulfonate group (Thermo 054995)? The colmun has lost its Resolution and peak to valley ratio?

The column is used in Ion Exchange Chromatography of Monoclonal antibodies and the method of analysis is based on pH gradint.

13 July 2024 7,462 1 View

My Cyclic voltammetry curve doesn't show cathodic peak of Cu2+ to Cu+. how to solve this problem?

I performed CV of Cu-MOF in a buffer solution of pH 8, and we did not find any peak corresponding to Cu2+ to Cu+. What is the reason behind this? Please give your valuable suggestions.

08 July 2024 2,388 4 View

Is it possible to generate a (semi-)permanent "transcription bubble" within a replicable plasmid?

I was wondering if it is possible to form a permanent open "ssDNA bubble" similar to a transcription bubble (>13 nucleotides) within E. coli. These criteria are important: 1. Open ssDNA...

07 July 2024 8,275 5 View

Which/who is the best laboratory/researcher that can provide syntethised mixed-layer clays?

Hi all, I am looking for some syntethised samples of mixed-layer clays to perform infrared reflectance spectroscopy measurements in the VNIR-SWIR-MWIR-LWIR regions. Best regards, Lionel Fonteneau

01 July 2024 3,875 2 View

Is it possible for the soil pH to be around 8, but with negligible amounts of carbonates, bicarbonates and exchangeable sodium?

Can this pH of 8 be due to the presence of other substances? Or do I have an error somewhere in the analysis? Thank you!

26 June 2024 9,093 4 View

How to Differentiate Tuffaceous Matrix from Clay Matrix in Sandstone Thin Sections?

I am conducting a study on sandstone samples and need to accurately differentiate between tuffaceous matrix and clay matrix when examining thin sections under a polarized light microscope. While...

20 June 2024 3,270 0 View