I have arsenic precursors like arsenic tirioxide, i need to prepare AS(III) solution for the electrochemical detection. Is it need to dilute arsenic precursor in acid to make AS(III)? or else we can use any base? If we need to use acid or base what is the required concentration of acid or base in the preparation?
you can use excessivebase (NaOH or KOH) to prepare AsO33+, you can also electrochemically detect in excessive base (NaOH or KOH) solution.
Hello, you can use 5% HNO3 to prepare AS(III) solution for the electrochemical detection.
Dear
you can used 0.1 - 0.5 M HCl to dissolve arsenic tirioxide to prepared a stock solution of arsenic (III) this for acidic media of electrochemical detection.
To dissolve As(III) oxide, you have to put As2O3 in a glass beaker, add water, heat mixture close to boiling point and while keeping that temperature, start adding the peaces of solidus NaOH, while constantly stir the solution. Peaces of NaOH have to be added successively, next peace have to be added when previous is completely dissolved. When As2O3 is completely dissolved, leave solution to cool and then neutralize (set pH to desired value) with appropriate acid. I used 2M solution of sulphuric acid.
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