摘要
建立了非完全消化-火焰原子吸收光谱法测定紫菜中铜的方法,样品在低温下用高氯酸:硝酸(V:V=1:3)混合酸消解,再用20%的OP乳化剂溶液溶解消解过程中产生的油脂,配制成均匀、透明的样品溶液。同时制备空白溶液。用标准曲线法测定,本法相对标准偏差为2.72%,回收率为98.7%~106.8%。方法检出限(3σ)为0.0015μg/mL。将该法与灰化法进行了比较,结果表明无显著性差异。
A method for determining of micro copper content in laver by incomplete digestion-flame atomic absorption spectrometry was studied.The laver sample was digested in a mixed acid consisting of HClO4-HNO3(V:V=1:3) at low temperature.The fat produced during the digestion process was dissolved by adding the emulsifier OP to make a homogeneous and transparent solution of the sample.The working curve method was applied,and a blank solution was used as reference.The detection limit(3σ) was 0.001 5 μg/mL.This method was used to determine the copper in laver,the relative standard deviation(RSD) was 2.72%,and the recoveries were 98.7%~106.8%.The analytical result obtained by the proposed method showed not significant difference compared with the traditional ashing method.
出处
《化学试剂》
CAS
CSCD
北大核心
2007年第11期665-666,686,共3页
Chemical Reagents
基金
山西省重点学科建设项目(2004506)
山西省高校科技开发项目(200611038)
关键词
火焰原子吸收光谱法
非完全消化法
紫菜
铜
flame atomic absorption spectrometry
incomplete digestion
laver
copper