在０．２ｍｏｌ／Ｌ　ＨＣｌ－１．０ｍｏｌ／ＬＮａＣｌ－０．１５ｍｏｌ／Ｌ抗坏血酸介质中，用电流氧化微分溶出计时电位法直接测定地质物料中微量Ｃｕ。富集电位－０．５５Ｖ，时间２０～４０ｓ；电极转速２５００ｒ／ｍｉｎ；溶出电流０．２～１μＡ；记录电位范围－０．２～－１．２０Ｖ；清洗电位－０．１０Ｖ，时间１０ｓ。方法检出限０．２μｇ／ｇ，线性范围２～４００ｎｇ／ｍｌ，精密度（ＲＳＤ，ｎ＝１１，４．１μｇＣｕ）６．５％，加标回收率９５％～１０５％。经标样分析验证，方法可靠。 In the 0.2 mol / L HCl-1.0 mol / L NaCl-0.15 mol / L ascorbic acid medium, the trace Cu in geological materials was directly determined by the current oxidation differential time-division potentiometry. Enrichment potential -0.55V, time 20 ~ 40s; electrode speed 2500r / min; dissolution current 0.2 ~ 1μA; recording potential range -0.2 ~ -1.20V; cleaning potential -0.10V, time 10s. The detection limit of the method was 0.2 μg / g with a linear range of 2 ~ 400 ng / ml and the precision (RSD, n = 11, 4.1 μg Cu) of 6.5% with the recoveries of 95% -105%. After the standard sample verification, the method is reliable.