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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 1,755 26 View
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...
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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...
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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...
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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...
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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...
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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 1,185 4 View