摘要
铜尾矿在微波消解仪中经盐酸-硝酸(3+1)溶液和过氧化氢消解。从所得消解液中分取部分试液,加入1-(2-吡啶偶氮)-2-萘酚(PAN)溶液、Triton X-100溶液、pH6.0的氢氧化钠-磷酸二氢钾缓冲溶液及饱和氯化钠溶液,加水定容至15mL,于70℃加热30min,使铜(Ⅱ)与PAN络合并溶入Triton X-100相中,实现铜(Ⅱ)的浊点萃取分离。弃去水相,于Triton X-100相中,加入水及3滴盐酸,用石墨炉原子吸收光谱法测定其中的铜量。铜的质量浓度在0.5~20μg·L^-1范围内与吸光度呈线性关系,检出限(3a)为0.36μg·L^-1。应用本方法分析了铜尾矿样品,并用标准加入法做回收试验,测得回收率在101%~105%之间,测定值的相对标准偏差(n=6)在3.00o~3.8%之间。
Sample of copper railings was digested with a mixture of HCl-HNO3 ( 3 + 1 ) and H2O2 in a microwave digestor. An aliquot was taken from the solution obtained and 1-(2-pyridineazo)-2-naphthol (PAN), Triton X-100, NaOH-KH2PO4 buffer solution of pH 3. 0 as well as NaCl saturated solution were added. After diluting to 15 mL with water, the solution was heated at 70 ℃ for 30 rain, to have the Cu^2+ separated in form of its complex with PAN by the cloud point extraction. After discarding the water phase, the Triton X-100 phase was taken up with water and 3 drops of HCl. The content of copper in this solution was determined by GF-AAS. Linear relationship between values of absorbance and mass concentration of Cu^2+ was kept in the range of 0. 5--20 μg · L^-1 , with detection limit (3σ) of 0. 36μg · L ^-1. The proposed method was applied to the analysis of a sample of copper tailings, and recovery was tested by standard addition method giving values of recovery and RSD's (n=6) in the ranges of 101%- 105 % and 3.0%- 3.8% respectively.
出处
《理化检验(化学分册)》
CAS
CSCD
北大核心
2013年第12期1497-1499,1503,共4页
Physical Testing and Chemical Analysis(Part B:Chemical Analysis)
基金
怀化学院大学生研究性学习和创新性实验计划项目(2012-18)
怀化学院应用化学重点学科项目
关键词
铜尾矿
铜
微波消解
浊点萃取
石墨炉原子吸收光谱法
Copper railings
Copper
Microwave assisted sample digestion
Cloud point extraction
GF-AAS