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Chemistry Forums for Students => Analytical Chemistry Forum => Topic started by: xshadow on October 31, 2021, 06:14:56 PM

Title: CHNSO - combustion for organic elemental analysis
Post by: xshadow on October 31, 2021, 06:14:56 PM

Hi

I have a dobut: with a CHNSO elemental analyzers can I analyze only the C/N/S/O/H with an  "organic origin" ?

 i.e. If in my organic sample there is also (for example) some inorganic carbon with an elemental analyzers it will be determinated like an interferent? (it would be a problem...i think)

Or inorganic carbon (or Nitrogen or sulfur) is not combusted in this process, with those temperatures ?
Another example the TOX analysis for determination of "organic halide"" in water....so if there is some  inorganic Cl₂ will not be determinated??

THANKS

Title: Re: CHNSO - combustion for organic elemental analysis
Post by: wildfyr on October 31, 2021, 07:05:23 PM

Correct, it cannot distinguish the origin of a material. That requires examination of the ¹³C to ¹²C ratio, which is an entirely different analysis.

Can't speak to the halide analysis.

Title: Re: CHNSO - combustion for organic elemental analysis
Post by: xshadow on November 02, 2021, 02:42:24 PM

Quote from: wildfyr on October 31, 2021, 07:05:23 PM

Correct, it cannot distinguish the origin of a material. That requires examination of the ¹³C to ¹²C ratio, which is an entirely different analysis.

Can't speak to the halide analysis.

Thanks:)

For halide analysis in water (for example) I've found that I can separate the inorganic halide (es: Cl-) using a filter with an activated carbon filter.  The organic compunds will be adosrbed by the filter and then they could be analyzed selectively