Determination of transition metals in nature

Transition metal complexes have special properties, including colour and unusual magnetic properties that are useful in bioanalysis. Traditionally the most widespread technique for determining transition metals in physiological and biological fluids has been atomic absorption spectrophotometry. 

There are two major analytical techniques to determine the concentration of particular metal elements in samples, namely atomic absorption spectroscopy and 

As mentioned above, the different colorimetric qualities can give some information as to the transition metal, and the following simple examples of different colourations of transition metal-containing compounds  

Chromium(II) halides Crp2 is green CrCL is white, CrBr2 is white, and Crl2 is red-brown. 

Chromium(III) halides Crp3 is green C1CI3 is red-violet CrBrs is green-black and Crls is black. 

---