Bayu Adi Samodro

7 Questions 3 Answers 0 Followers

Questions related from Bayu Adi Samodro

Why does mesoporous material have hysteresis loop in adsorption-desorption N2 curve?

Yesterday I measured the pore size with BJH method and I got 1.89 nm for the diameter pore and with BET method I got 450 m2/g for surface area. My material is modified ZSM-5. Looking at the...

19 May 2014 1,801 26 View

What is the best condition for analysis of methanol and formaldehyde with Gas Chromatography in a FID detector?

We are having a problem analyzing methanol and formaldehyde in an aqueous sample. We have a HP-Carbowax and Rtx-1 column. What is the best column for separation of methanol and formaldehyde? What...

23 April 2014 4,832 5 View

What do you expect from IR spectra of nh4-zsm-5?

I don't know what the difference is between IR spectra for na-zsm-5 and nh4-zsm-5. Any suggestions for what is the right characterization for knowing the exchange of Na ions to NH4 ions from...

31 March 2014 4,365 3 View

Which of these three methods for calculating the concentration of a metal sample is true?

I am kind of confused calculating the concentrations of some metal samples in my work. I digested a sample with acid then diluted it in a 250 ml volumetric flask. When I measured with AAS the...

28 March 2014 7,309 45 View

What weight to calculate the concentration of hexavalent chromium in the metal plating? Is it the weight of sample or weight of the plating?

I determined the concentration of hexavalent chromium with spectrophotometer uv - vis with diphenylcarbazide, after the extraction with base solution from metal plating. for calculating the amount...

27 August 2013 7,789 3 View

What if the intensity of sample is smaller than the intercept of calibration curve?

I am newb using ICP - OES. yesterday I used it to determine the concentration of chromium in lake water. I made a calibration curve and got a good curve. y=8234x+3452. but the intensity from the...

25 August 2013 5,319 9 View

Can we determine speciation of chromium in small steel parts?

Is it possible to determine the concentration of hexavalent and trivalent chromium in solid sample such as small steel parts? using uv-vis, aas, or icp-ms, probably How to extract hexavalent and...

15 July 2013 1,226 4 View