21 Questions 13 Answers 0 Followers
Questions related from Taher Rabizadeh
Dear Researchers, I want to apply a layer of PVP (Polyvinylpyrrolidone)on a metallic substrate. But the applied layer gets dissolved in water during the corrosion test. Besides crosslinking, what...
08 August 2023 8,205 1 View
Hi, I would appreciate it if you could explain to me which equation is correct for the second-order reaction. In the most textbooks I see "K" instead of "2K" in the equation. Please also see the...
14 April 2023 2,942 5 View
Dear researchers, I would appreciate if you could guide me on the following question: I put a mild steel specimen in 0.1 M HCl solutions without and with an amino acid corrosion inhibitor. I...
14 June 2018 9,511 3 View
Hi every body, I added an inhibitor to the 1 M HCl solution and assessed the corrosion behavior of mild steel by electrochemical impedance spectroscopy. Would you please tell me which EIS...
31 May 2018 8,777 4 View
Dear Researchers, I want to make tap water with different harness and Cl to SO4 ratio, I would appreciate if you could guide me how to do it. Is there any recipe? What are the main...
02 February 2018 1,261 8 View
Hi all, I synthesise crystals in the presence of organic and inorganic additives. Aqueous chemistry analysis shows that there are surface adsorptions and crystal incorporations. Also there are...
14 October 2015 9,135 9 View
Hi, I have added Sr/Na/Mg to the gypsum precipitation solution and want to study the Sr-gypsum interaction by solid states NMR would you please guide me? 1- Can solid states NMR tell me about...
25 June 2015 9,895 2 View
Hi all, I would appreciate if you could guide me about the question below: 1- I have some solutions which contain Ca: 50-300 ppm, Mg: 13-51 ppb!!!, and Na: 2-10ppm. Can I prepare the Mg and Na...
17 June 2015 7,023 3 View
I analyzed two kinds of powders (gypsum, gypsum+additives) by FTIR (attached file). There is decrease in peaks intensity and absorbance. What does it show? Can it be just because of the amount of...
22 May 2015 2,560 35 View
Hi, I have a solution with composition (Ca=2500ppm, Mg=730ppm SO4=4800ppm, Cl=7000ppm). I used ion chromatography to analyze cations concentration. I made standard solution. To prepare samples I...
05 May 2015 2,767 12 View
Hi all, I want to analyze adsorption of phosphonate on gypsum (CaSO4.2H2O) crystal. I want to know if I can use XPS or not. Someone told me as XPS performs in vacuum then gypsum might dehydrate....
27 March 2015 6,310 4 View
Hi all, I would appreciate if you could guide me.My solution contains 2500ppm calcium, 5000ppm sulphate, 8000ppm sodium, 8000ppm chloride and I add 10ppm NTMP (nitrilotri(methylenephosphonic)...
17 March 2015 1,917 4 View
Dear Researchers, I added 10ppm "nitrilotris methylene phosphonic acid" (NTMP) to water and I want to measure the P concentration during the time. Would you please guide me to measure the P...
06 March 2015 2,149 1 View
Dear Researchers, I want to calculate the saturation index or ratio of galena in high saline solution (20%NaCl). As the ionic strength is high. Would you please guide me which database of...
30 December 2014 2,705 8 View
Hi all, I want to calculate the speciation and activity coefficient of the solution below by Phreeqc 3.1 but as far as know as the ionic strength of the solution is more than 0.1M then instead of...
27 December 2014 3,371 10 View
Would you please guide me bout capillary zone electrophoresis? 1- Can capillary zone electrophoresis method be useful to determine the concentration of Calcium, magnesium, sulfate and citrate in...
25 May 2014 7,799 6 View
I mix calcium chloride, magnesium chloride and sodium sulfate in solution and during the reaction I take samples to measure their concentration variations. the initial concentrations of calcium is...
20 May 2014 3,685 1 View
Is there any reliable free software to draw the acid dissociate vs. pH plot? For example, in the case of citric acid at pH=7, the portion of the ions in the solution?
06 April 2014 7,257 4 View
I have an XRD pattern of gypsum crystals and I want to determine if each peak is related to which face. Would you please help me? I attached the information. Would you please also guide me why...
02 February 2014 6,031 2 View
Would you please guide me about questions below via the attached file: I mixed calcium chloride and sodium sulfate and precipitated prismatic monoclinic needle shape gypsum crystals that SEM (fig...
01 February 2014 4,066 6 View
I did an XRD test for gypsum crystals which have a needle shape. One peak has much more intensity than others. I have other kinds of gypsum crystals which have been produced in other conditions...
03 January 2014 1,107 8 View
