Please indicate the original system. ( solid, solution, mixture,  (

It will depend on the sample, but it can be performed by LC-ICP/MS

Hi everybody,thank you for replies.Infact i wanted to know in liquid samples

regards

susan verghese p

Voltammetry

HPLC.

 CrVI : colorimetric with diphenylcarbazide ( is very sensitive)I

Then total Cr by flame (reductant) AA.

The difference is CrIII.

Other approach is precipitation  of ´CrO4 2- as BaCrO4- Filter and AA in flame( it gives only CrIII.

Chromium 6+ gives spectra at 445 nm wavelength and Chromium 3+ gives spectra at 595 nm after digestion  so from this we can specify  between the spectra of Cr+3 and Cr+6 using UV- Visible Spectrophotometer

The spectra is useful with pure solutions,.

Cr 3+ can be determined by complexometric titration