Hamed Khodadadi Tirkolaei

10 Questions 9 Answers 0 Followers

Questions related from Hamed Khodadadi Tirkolaei

Can anyone help with cation-coated sand grains?

I need to treat the sand (light yellow quartz, 92% SiO2) with Ca2+ in order to increase the positive charge concentration on grains surface. How can I do it?

12 June 2014 3,973 1 View

Can we autoclave urea dissolved in a solution containing NH4Cl?

I know that urea will be decomposed to NH3 and CO2 when it is heated (NH2COONH4(s) 2NH3(g) + CO2(g)). But if we add urea to the solution containing enough concentration of NH3 (e.g. solution with...

18 December 2013 6,555 6 View

To what extent does the pH of a solution change after flowing within a dry sandy soil?

I am going to inject a solution into a sandy soil. This is important to know the range of changes in pH of the injected solution. What are the influencing factors and how can I know the range of...

03 December 2013 345 17 View

Which pH level of acidic water is most effective for removing carbonate content from quartz sand?

In our research work we need to minimize the carbonate content of our quartz sand (containing quartz, calcite, feldspar, dolomite). We are going to wash the sand with acidic water (distilled water...

11 November 2013 3,507 8 View

How can I set up a bender element equipment for measurement of shear wave velocity in soil samples?

As I found we should have a transmitter piezo sensor connected with signal generator (waveform producer) and a receiver piezo sensor connected with oscilloscope. Is it true? If so, where can i buy...

27 October 2013 5,044 5 View

May urea be sometimes autoclaved for sterilization? Should it not be always filter-sterilized?

I saw in some papers that they mixed urea with nutrient broth, NH4Cl and NaHCO3 and then autoclaved. Can urea be autoclave-sterilized in combination with other chemicals?

21 October 2013 945 6 View

What is the cheapest, fastest and easiest method for measuring amount of CaCO3 precipitation in a solution?

I am using filter paper method (0.2micro meter) to find amount of CaCO3 precipitation in more than 80 solutions. As the filter paper method is a little bit expensive, I would like to know if there...

03 October 2013 5,912 2 View

How can I prepare Tris buffer solution pH9? Can it be sterilized by using autoclave?

As Tris buffer solution is expensive to buy I want to prepare it using Tris powder which is cheaper.

24 September 2013 4,094 10 View

Is there any soil improvement technique for decreasing earthquake amplification?

Currently the seismic response of site is considered in structural design part of buildings (as a design spectrum). I want to know if there is not a specific soil improvement technique to mitigate...

09 March 2013 7,460 2 View

Can adjusting the pH of culture media with NaOH or HCl influence performance of bacteria?

I am investigating the urease activity of S.pasteurii. Na+ and Cl- have not any influence on its urease activity, according to literature. Are there any other points which should be considered as...

03 March 2013 6,344 7 View