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Chemistry Forums for Students => Analytical Chemistry Forum => Topic started by: xshadow on November 08, 2021, 04:19:45 PM

Title: LIBS spectroscopy
Post by: xshadow on November 08, 2021, 04:19:45 PM

Hi

I don't understand why in LIBS I have a strong matrix effect!

Plasma temperatures reached in libs are very high (9000K) so the matrix should be destroyed ...mhhh

Title: Re: LIBS spectroscopy
Post by: Corribus on November 08, 2021, 10:47:49 PM

In some ways the same reason you get matrix effects in other methods that depend on sample atomization, coupled with the fact that ablation physics are complicated and frankly not very well understood.

Title: Re: LIBS spectroscopy
Post by: xshadow on November 09, 2021, 07:06:50 AM

Quote from: Corribus on November 08, 2021, 10:47:49 PM

In some ways the same reason you get matrix effects in other methods that depend on sample atomization, coupled with the fact that ablation physics are complicated and frankly not very well understood.

thanks :)
 
So due te the strong matrix effect LIBS is usually  used for semi-quantitative determination....LODs are high, right?

Title: Re: LIBS spectroscopy
Post by: Corribus on November 09, 2021, 10:19:45 AM

Not an expert by any means but my understanding is that full quantitative analysis using LIBS is achievable, even without material standards. Just google "quantitative LIBS spectroscopy" or some such and you'll find lots of hits.