Denis Rodrigues

9 Questions 2 Answers 0 Followers

Questions related from Denis Rodrigues

Best methods to quantifiy the phases of a mixture of crystals/minerals?

Greetings. Up until now didn't need to quantify minerals, a qualitative analysis was enough, but I wonder if needed what are the best and more feasible/acessible methods to quantify the...

12 April 2023 4,065 3 View

Anova or t-test? Best method to test how significant the difference of the mean values using 4 different reactants is?

Hello everyone. I am testing which of the 4 reactants I selected give better recovery yields for a given chemical process. So I performed the triplicate of each and have the results, calculated...

02 November 2021 6,782 10 View

Physical-chemical formation of stalactites/stalagmites. what promotes the formation/growth of these structures?

I know, or think I do, the basic idea behind these natural structures, as from what I know they form due to water dripping from the top leaving a salt deposit behind. But started to wonder about...

23 February 2021 1,902 4 View

Can the intensity of this broad band in XRD mask other crystaline phases present?

I obtained a XRD diffractogram with significant broad band at low 2theta levels, also around 30 2theta another smaller broad band appears. It all points out to the existence of an amorphous phase....

20 February 2021 8,621 4 View

Is it possible to use a muffle furnace without N2 atmosphere to make Biochars?

Greetings Everyone. I am reading several articles about biochars and notice several use N2 atmosphere inside the muffle furnace. can you produce biochars without this N2 atmosphere or other inert...

18 August 2020 9,241 6 View

What tunes the selectivity of ionic exchange towards an ion? can we predict it? Is it pH dependent?

Cheers Everyone. I was seeing some uses of ionic exchange to recover NH4 by ionic exchange with other cations in a specific matrix. And it brought me to question what drives an ionic exchange to...

18 February 2020 6,784 3 View

How to account for Dillution effect on Mg, Ca, Na and K concentrations on Atomic absorption spectrometry method?

Cheers. I wanted to know how much Mg, Ca, K and Na a specific Salt had. So I weighted 1g of the material, left it 24h to dry remeasured its mass, and then another 24h at 500ºC. After that the...

14 July 2019 5,840 2 View

Can an element be absent from a EDX report if it is present in a low concentration?

Hi. My question comes from the following: I was studying the precipitation of phosphates and EDX clearly shows the elements forming the phosphates. it also shows Mg, that were the ions most...

28 January 2019 349 2 View

Can we infer crystallinity or structure organization from XRD diffractograms and number of counts?

Hi everyone. I am studying the precipitate output at 4 pH levels, and got the stacked diffractometers in attachment. My question is, can I say from the image higher counts for the same peak...

06 November 2018 7,917 5 View