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本文用硝酸—氢氟酸溶样,高氯酸冒烟除去氟和硅后,以酒石酸—乙醇胺作为总离子强度缓冲剂,采用钢离子选择性电极直接电位法测定。它具有对铝及其共存元素掩蔽效果良好,缓冲容量大,pH值易控制,共存元素含量为Al~(3+)100mg、Fe~(3+)1.2mg、Cu~(2+)6mg、Ti~(4+)1.0mg、Mg~(2+)1.4mg时不干扰测定的特点。操作手续简便,易于掌握,适用于钠含量大于0.01％的铝合金试样。
In this paper, nitric acid - hydrofluoric acid dissolved samples, perchloric acid fumes to remove fluorine and silicon, with tartaric acid - ethanolamine as the total ionic strength buffer, the use of steel ion selective electrode direct potentiometry. The invention has the advantages of good masking effect on aluminum and its coexisting elements, large buffering capacity and easy pH control, and the content of the coexisting elements is 100 mg of Al 3+, 1.2 mg of Fe 3+, 6 mg of Cu 2+, Ti ~ (4 +) 1.0mg, Mg ~ (1.4mg) does not interfere with the determination of the characteristics. Operating procedures is simple, easy to grasp, suitable for sodium content greater than 0.01% of the aluminum alloy sample.