DETEMINATION OF As(III) IN GROUNDWATER BY CE-C4D USING DYNAMIC pH JUNCTION ONLINE PRECONCENTRATION
Đoàn Thị Hải Yến
Nguyễn Thị Liên
Phạm Tiến Đức
Phạm Thị Ngọc Mai
Nguyễn Thị Ánh Hường
Nguyễn Vân Anh
Nguyễn Xuân Trường
Abstract
Online preconcentration followed by capillary electrophoresis with capacitivelycoupled contactless conductivity detection (CE-C4D) was evaluated as an approachfor the determination of arsenite -As(III)- in groundwater samples. The runningbuffer employed consisted of 14 mmol/L arginine and 100 mmol/L 3-(Cyclohexylamino)-1-propanesulfonic acid (pH 9.6). Formic acid 15mM was found tobe the optimal sample matrix. Under these optimized conditions, the limit of detection(LOD) was 2,96μg/L and the recovery was approximately 100%. The developedanalytical procdure was applied to analyze four water samples taken from Hanoiwater supply number 2 joint stock company.