Dear researchers,
I have been working on the preparation of a triacid mixture in the ratio HNO3: H2O2: HCL: 150:125:5 ml. I start the mixture by adding a little volume (5 ml) of H2O2 to HNO3; however soon after the pouring of H2O2 into the HNO3 solution, sudden reaction occurs where the mixture develops color and releases dense fumes. However, within 1-2 minutes, the mixture again becomes colorless. My query is that if the mixture can be used for further analyses even if the mixture developed color initially?
Thanking you in anticipation!
Regards
Priyanka
Clearly your selection of HNO3, HCL and H2O2 for your tri-acid solvent causes a chemical reaction and it is probably an unsuitable choice. A brief review of the literature on tri-acid mixtures reveals a wide range of satisfactory alternative mixtures. For example, HN03 mixed with HClO4 (Perchloric acid) and H2S04 (Sulphuric acid) is referred to as a suitable digestion-solvent mixture. The reaction of H202 with HN03 is not well understood, but the fumes you observe are probably Nitrogen oxides. Please look on line to find a tried and tested alternative solvent. In all cases, note carefully any warnings about the mixing sequence.
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