贵金属
貴金屬
귀금속
PRECIOUS METALS
2003年
3期
30-35
,共6页
分析化学%精密测定%库仑分析%金%材料
分析化學%精密測定%庫崙分析%金%材料
분석화학%정밀측정%고륜분석%금%재료
analytical chemistry%precise determination%coulometric analysis%gold%materials
提出了在Fe(Ⅲ)-EDTA-ClCH2COOH-NaOAc缓冲溶液中利用电生Fe(Ⅱ)-ED-TA络合物精密库仑滴定Au的方法.采用电位法检测终点,测定范围在5.2～17.0mg Au时,相对平均误差和标准偏差≤0.03%.方法可用于纯金、金合金和首饰等材料中Au含量的精密分析,选择性很好.讨论了电生Fe(Ⅱ)-EDTA络合物作库仑滴定剂的理论基础,获得了有益的结论.
提齣瞭在Fe(Ⅲ)-EDTA-ClCH2COOH-NaOAc緩遲溶液中利用電生Fe(Ⅱ)-ED-TA絡閤物精密庫崙滴定Au的方法.採用電位法檢測終點,測定範圍在5.2～17.0mg Au時,相對平均誤差和標準偏差≤0.03%.方法可用于純金、金閤金和首飾等材料中Au含量的精密分析,選擇性很好.討論瞭電生Fe(Ⅱ)-EDTA絡閤物作庫崙滴定劑的理論基礎,穫得瞭有益的結論.
제출료재Fe(Ⅲ)-EDTA-ClCH2COOH-NaOAc완충용액중이용전생Fe(Ⅱ)-ED-TA락합물정밀고륜적정Au적방법.채용전위법검측종점,측정범위재5.2～17.0mg Au시,상대평균오차화표준편차≤0.03%.방법가용우순금、금합금화수식등재료중Au함량적정밀분석,선택성흔호.토론료전생Fe(Ⅱ)-EDTA락합물작고륜적정제적이론기출,획득료유익적결론.
A method of precise coulometric titration of Au(Ⅲ)was studied with electrogenerating Fe(Ⅱ)-EDTA as titrant in Fe(Ⅲ)-EDTA-ClCH2COOH-NaOAc buffer solution.For the determination of gold in the range of 5.2 to 17.0mg ,the relative average errors and RSD of the results were≤0.03%(n=5),using potentiometric end point detection.The proposed method has been applied to the precise analysis of gold content in pure gold,gold alloys and jewelry with good selectivity.The theoretical basis for electrogeneration Fe(Ⅱ)-EDTA complex as a coulometric titrant was also discussed and a useful conclusion was obtained.
