VOLTAMMETRIC DETERMINATION OF SOME ORGANIC COMPOUNDS OF ARSENIC REDUCED AT THE MERCURY ELECTRODE

Cyclic voltammetric scans for methylarsonic acid, dimethylarsinic acid and 3-acetamido-4-hydroxyphenylarsonic acid at amercuryelectrode in an acidic medium show anodic adsorption waves when the starting potential is sufficiently negative; the related arsines are formed on the electrode. Detection limits are at the micromolar level for the absorption peak found at about −0.1 V vs. SCE for all three compounds. Interferences are discussed.