Nguyen Binh

4 Questions 6 Answers 0 Followers

Questions related from Nguyen Binh

When analyzing VOCs in the air, is a packed column better or a capillary one?

I am analyzing VOCs in the air and have a question about choosing a column for good separation of VOCs. I use GC-FID and inject 1 uL (split ratio: 1:10).

13 September 2021 9,684 10 View

Is it possible when the BTEX desorption efficiency (DE) after one extraction is about 40%?

The mass of analyte found in the sample is corrected for DE. So if the DE value is low but stable, will it be ok to use the value of 40%. I increased the number of extractions by 2 and 3 times and...

20 June 2021 6,201 0 View

Why carbon disulfide can extract BTEX better than dichloromethane (DCM) and DCM can extract BTEX better than acetone?

Carbon disulfide is a nonpolar solvent (dielectric constant ε = 2.6, dipole moment µ =0). Therefore, it can extract well non/less polar compounds (BTEX) (hydrophobic interactions). DCM can also...

31 May 2021 6,173 2 View

Why the lines of the desorption efficiency versus the concentration of BTEX in charcoal adsorbent are curved instead of linear?

I determined the desorption efficiency of BTEX based on the NIOSH 1501 standard at five different concentrations (0.5/2/4/50/100 mg/L). I injected 20 uL of DE stock solution onto 400 mg charcoal...

17 April 2021 4,254 4 View