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矿石中砷的示波极谱测定已有报导.但其测定体系用于铜精矿中砷的测定,因主体铜的严重干扰,尤其对于低含量砷的测定,干扰更为严重,尚须进行沉淀分离,与其它方法比较,无明显优点;另一方面其测定体系采用碘化铵,经我们反复试验,发现空白值太高,对于测定低含量砷,准确度较差,而重现性也不好.本文通过试验,发现在碘化钾——硫酸——碲——EDTA体系中,于电位约-0.64伏(对S.C.E),砷能产生一个非常尖锐而对称的导数吸附催化波,而且体系无空白,
Oscillographic polarographic determination of arsenic in ore has been reported, but its determination system is used for the determination of arsenic in copper concentrates. Due to the serious interference of the host copper, especially for the determination of low levels of arsenic, the interference is more serious and must be carried out Precipitation separation, compared with other methods, no obvious advantages; the other hand, the determination of the system using ammonium iodide, after repeated tests we found that the blank value is too high for the determination of low levels of arsenic, the accuracy is poor, and reproducibility In this paper, we found that arsenic has a very sharp and symmetric derivative catalytic adsorption wave in a potassium iodide-sulfuric acid-tellurium-EDTA system at a potential of about -0.64 V (for SCE) blank,