how are spectra used in forensic science? give two examples?

Answer 1

Usually the spectra are linked with analytical determinations to define carefully the quantity. For an example, Chromatography is used often with mass spectroscopy and from fragmentary peaks you can reform the molecule(s) you need to know.
Other times, after sampling and purification of the sample you may perform UV or IR or NMR on organic compounds to state if there are drugs/ poisoning agents. Sometimes (UVs) to establish the concentration, you may have to perform the measures with some "blanks" that reproduce a straightforwardly increasing line, with 2 distinct points that are your beginning and ending concentrations, where in the meanwhile you think your unknown concentration is... Soon after the measurement, you can extrapolate that value using the common formulas used for calculating the concentration to establish if it is contamined or not. that is useful in forensic science to determine if - for an example you may find too high poisoning concentrations in the blood of a dead or if a compound may contain drugs or not,

Answer 2

I'm not sure which type of spectra you are talking about but two examples are:
1. Mass spectrometers which are used to identify chemical substances by breaking individual molecules of a substance into smaller fragments of different mass, then counting the number of fragments of each mass produced. The results are plotted as a bar graph, called a mass spectrum. The pattern thus produced creates a graphic profile of a chemical substance, which then can be compared against others and identified.
2. FTIR spectroscopy (Fourier Transform Infrared spectroscopy) which measures the absorption, scattering, or emission of electromagnetic radiation by atoms or molecules in order to identify compounds.

Answer 3

heating different materials give of different spectra... sodium yellow... i think mg is red...

Answer 4

you got it Fabrizio G.....