摘要
建立了以二乙基二硫代氨基甲酸钠(DDTC)为络合剂,硫酸钠-氯仿-水盐析萃取,紫外可见分光光度法测定痕量铜(Ⅱ)的新方法。研究了萃取的条件,共存离子的干扰。结果表明本法灵敏度高,选择性好,在最佳实验条件下,铜的线性范围为0.002～0.08μg/mL,0.002μg/mL铜标准液测定的RSD=1.9%(n=7),检出限为0.11ng/mL。应用于金银花、甘草、枸杞中铜的测定,回收率分别为103%、102%、96%,RSD分别为1.5%、1.9%2、.0%。
A new Na2SO4 salting-out extraction method has been developed for preconcentration trace amounts of copper as a prior step to its determination by UV-visible spectrophotometry,in which diethyldithiocarbamate（DDTC） was used as complexing agent,with chloroform as extraction solvent.Variables affecting salting-out extraction efficiency were investigated and optimized.Under the optimal conditions,the calibration curve was linear in the range of 0.002 μg/mL～0.08 μg/mLof copper,detection limit was 0.11 ng/mL in original solution（3Sbc/m） and the relative standard deviation for seven replicate determination of 0.002 μg/mL copper was ±1.9%.The proposed method has been applied for determination of copper in Honeysuckle,Radix Glycyrrhiza,Lycium samples with satisfactory results,the recovery were 103%,102%,96%,RSD were 1.5%,1.9%,2.0%,respectively.
出处
《化学研究与应用》
CAS
CSCD
北大核心
2011年第2期244-247,共4页
Chemical Research and Application
