Dispersive liquid-liquid microextraction combined with online preconcentration MEKC for the determination of some phenoxyacetic acids in drinking water

2013 ◽  
Vol 36 (18) ◽  
pp. 3067-3074 ◽  
Author(s):  
Yaohai Zhang ◽  
Bining Jiao
Keyword(s):  
Drinking Water ◽  
Online Preconcentration ◽  
Phenoxyacetic Acids ◽  
Dispersive Liquid Liquid Microextraction ◽  
Liquid Microextraction

Spectrophotometric Determination of Mercury in Water Samples After Preconcentration Using Dispersive Liquid–Liquid Microextraction

2012 ◽  
Vol 95 (1) ◽  
pp. 227-231 ◽  
Author(s):  
Valfredo Azevedo Lemos ◽  
Liz Oliveira dos Santos ◽  
Eldevan dos Santos Silva ◽  
Emanuel Vitor dos Santos Vieira
Keyword(s):  
Drinking Water ◽  
Water Samples ◽  
Sea Water ◽  
Certified Reference Materials ◽  
Simple Method ◽  
Rich Phase ◽  
Subsequent Determination ◽  
Dispersive Liquid Liquid Microextraction ◽  
Liquid Microextraction

Abstract A simple method for the determination of mercury in water samples after preconcentration using dispersive liquid–liquid microextraction is described. The procedure is based on the extraction of mercury in the form of a complex and its subsequent determination by spectrophotometry. The complex is formed between Hg(II) and 2-(2-benzothiazolylazo)-p-cresol. The detection at 650 nm is performed directly in the metal-rich phase, which is spread on a triacetylcellulose membrane. The method eliminates the need to use a cuvet or large quantities of samples and reagents. The parameters that influence the preconcentration were studied, and the analytical characteristics were determined. The enrichment factor and the consumptive index for this method were 64 and 0.16 mL, respectively. The LOD (3.3 μg/L) and LOQ (11.1 μg/L) were also determined. The accuracy of the method was tested by the determination of mercury in certified reference materials BCR 397 (Human Hair) and SRM 2781 (Domestic Sludge). The method was applied to the determination of mercury in samples of drinking water, sea water, and river water.

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