Premium
Study of Spectrophotometric Method for Determination of Trace Copper after Separation/Enrichment using Microcrystalline Absorption System
Author(s) -
Tu ChangQing,
Wen And XinRong
Publication year - 2010
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.201000053
Subject(s) - chemistry , microcrystalline , copper , atomic absorption spectroscopy , precipitation , ammonium chloride , trace amounts , chloride , absorption (acoustics) , nuclear chemistry , analytical chemistry (journal) , inorganic chemistry , chromatography , medicine , physics , alternative medicine , organic chemistry , pathology , quantum mechanics , meteorology , acoustics , crystallography
The paper presents a novel method for the separation/enrichment of copper using microcrystalline absorption system prior to the determination of trace copper by spectrophotometry. The effects of different parameters, such as the dosages of KI and cetyltrimethyl ammonium chloride (CTMAC), various salts and acidity etc on the enrichment yield of Cu 2+ have been investigated to select the experimental conditions. The possible enrichment mechanism of Cu 2+ was discussed. The results showed that under the optimum conditions, cetyltrimethyl ammonium chloride cation (CTMAC + ) reacted with I − to produce the microcrystalline matter (Ms‐M) of (CTMAC + ṁI − ), Cu 2+ in the solution was absorbed on the surface of Ms‐M of (CTMAC + ṁI − ) and reacted with I − to form the precipitation of CuI, Cu 2+ was completed enriched on the Ms‐M of (CTMAC + ṁI − ). Thereby Cu 2+ was separated completely from K + , Na + , Ca 2+ , Mg 2+ , Zn 2+ , Ni 2+ , Co 2+ , Mn 2+ , Fe 2+ and Al 3+ at pH 4.0. A new method of determination of trace copper was established. The proposed method has been successfully applied to the determination of trace Cu 2+ in the sample of human hair, and the results agreed well with AAS method. The recoveries were 94.5% ∼ 105.6%, and the RSD was 2.2% ∼ 2.5%.