title: Simultaneous square wave voltammetric determination of 2-mercaptobenzothiazole and 2-mercaptobenzoxazole by partial least squares method in water samples.
abstract: A rapid sensitive and versatile method for simultaneous determination of 2-mercaptobenzothiazole (MBT) and 2-mercaptobezoxazole (MBO) based on the square wave voltammetric (SWV) using mercury drop electrode (SMDE) has been presented. A three-electrode system containing SMDE working electrode, Pt auxiliary electrode and Ag/AgCl reference electrode was used throughout. The linear calibration graphs are in the concentration range of 7-40 microg mL(-1) and the equations are: (Deltai)=1.372CMBT-9.112 (r=0.9982) and (Deltai)=0.246CMBO-1.736 (r=0.9985) for MBT and MBO, respectively. Partial least squares regression (PLS) was applied to resolve the seriously overlapped voltammograms without any pre-separation step. The five level partial factorial design was used as calibration design method and the cross-validation method was used to select the number of significant factor for PLS model building. Five significant PLS components are used for MBT and MBO. A set of synthetic sample mixtures were used to validate the propose method. The root-mean-square errors of predictions (RMSEPs) and percent of relative prediction errors (RPEs) are 0.841 and 0.777 microg mL(-1) and +/-3.58 and +/-3.74% for MBT and MBO, respectively. The developed method was then applied to the analysis of these two compounds in different water samples with satisfactory results.
authors.affiliation: Department of Chemistry, Faculty of Science, Shahid Chamran University, Ahvaz, Iran. hoparham@yahoo.com
authors.forename: H
authors.initials: H
authors.lastname: Parham
authors.forename: B
authors.initials: B
authors.lastname: Aibaghi
authors.forename: J
authors.initials: J
authors.lastname: Ghasemi
mesh_terms: D052160:Benzothiazoles / Q000032:analysis*; D001583:Benzoxazoles / Q000032:analysis*; D002138:Calibration; D004563:Electrochemistry / Q000379:methods*; D004566:Electrodes; D006863:Hydrogen-Ion Concentration; D016018:Least-Squares Analysis; D008956:Models, Chemical; D015233:Models, Statistical; D015999:Multivariate Analysis; D012044:Regression Analysis; D015203:Reproducibility of Results; D013438:Sulfhydryl Compounds / Q000032:analysis*; D014867:Water / Q000737:chemistry*
chemical_list: D052160:Benzothiazoles; D001583:Benzoxazoles; D013438:Sulfhydryl Compounds; D014867:Water; C005563:captax; C525534:2-mercaptobenzoxazole