title: Composition-ratio determination of Chrome Azurol S (CAS) with Cu(2+) and research on dynamic reaction process of CAS with EDTA.
abstract: The composition-ratio of Chrome Azurol S (CAS) with Cu(2+) and dynamic reaction process of CAS with EDTA were studied by spectrophotometry. The composition-ratio of Cu(2+) with CAS (2:1) was successfully determined using the method of lines and EDTA complexing substitution. The effects of temperature, time, pH, concentration of cetyltrimethylammonium bromide (CTMAB), and concentration of Cu(2+) on the absorption spectrum were also discussed. By optimizing experimental conditions, the dynamic process of displacement of CAS, which forms the ternary compound Cu-CAS-CTMAB, by EDTA were determined. The test results indicated that EDTA can replace 99.6% of the CAS quickly when heated. The system reached equilibrium finally. This research method can be applied to the qualitative and quantitative analysis of related Cu complexes.
authors.affiliation: School of Environmental Science and Engineering, Shandong University, Jinan, Shandong 250100, PR China. HTUrutaoliu@sdu.edu.cnUTH
authors.forename: Rutao
authors.initials: R
authors.lastname: Liu
authors.forename: Ling
authors.initials: L
authors.lastname: Li
authors.forename: Yanmin
authors.initials: Y
authors.lastname: Tian
authors.forename: Zhaohui
authors.initials: Z
authors.lastname: Tan
authors.forename: Canzhu
authors.initials: C
authors.lastname: Gao
authors.forename: Xiaopeng
authors.initials: X
authors.lastname: Hao
mesh_terms: D000077286:Cetrimonium; D002593:Cetrimonium Compounds / Q000737:chemistry; D002614:Chelating Agents / Q000737:chemistry; D002863:Chromogenic Compounds / Q000737:chemistry; D003300:Copper / Q000737:chemistry*; D004492:Edetic Acid / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D062385:Hydroxybenzoates / Q000737:chemistry*; D013053:Spectrophotometry; D013056:Spectrophotometry, Ultraviolet; D013696:Temperature
chemical_list: D002593:Cetrimonium Compounds; D002614:Chelating Agents; D002863:Chromogenic Compounds; D062385:Hydroxybenzoates; C015076:chrome azurol S; D003300:Copper; D004492:Edetic Acid; D000077286:Cetrimonium