摘要
建立二乙基二硫代氨基甲酸钠(DDTC或铜试剂)光度法测定铜含量的方法。实验结果表明,在pH值4～5的条件下,Cu-DDTC配合物的最大吸收波长为460 nm,摩尔吸光系数为1.0×104L/(mol.cm),线性范围为0～2.4μg/mL,加标回收率为94.9%～104.1%,RSD为3.1%～5.7%。该方法可用于样品中常量铜的测定,并且大量的银存在时也不干扰铜的测定。经用于银包铜粉样品中铜含量的测定,结果符合要求。
A method to determine the content of copper by spectrophotometry with sodium diethyldithiocarbamate was established.The results indicated that under the medium of pH 4～5,the maximum absorption wavelength of the Cu（Ⅱ） and DDTC micellar complex is at 460 nm,the apparent molar absorptivity coefficient is 1.0×104 L/（mol·cm）.The Beer＇s law is obeyed in the range of 0～2.4 μg/mL.The recovery is 94.9%～104.1%,with relative standard deviation is 3.1%～5.7%.It is an excellent method to determine constant copper at acidic conditions as well as exclute the interference of a large number of silver by choosing the appropriate conditions.The proposed method has been applied in determination of copper in sample of silver coated copper powder with satisfactory results.
出处
《应用化工》
CAS
CSCD
2011年第5期903-905,共3页
Applied Chemical Industry
关键词
银包铜
铜
DDTC钠盐
分光光度法
silver coated copper powder
Cu（Ⅱ）
DDTC
spectrophotometry
