Chemical analysis of main arsenic species in mixtures of AsIII and AsF6−

Known analytical techniques are not applicable to the accurate and precise determination of AsV and total arsenic (Ast) in the mixtures of AsIII and AsF6−. For this reason, an accurate and precise analytical procedure for determination of the content of AsV and Ast in the range of 5–10 mg of As with a relative standard deviation (R.S.D.) smaller than 0.4% was developed. The results were proved by the determination of AsIII by titration with KBrO3 and gravimetric determination of AsF6− species.