Development of a portable spectrophotometric device with flow-based analysis system for detection of heavy metal ions

Name: Metida Srikullaphat

Organization : Chulalongkorn University. Faculty of Science

Name: Passapol Ngamukot

Organization : Chulalongkorn University. Faculty of Science

Email : passapol.ngamukot@gmail.com

keyword: Flow-based analysis

LCSH: Spectrophotometry

LCSH: Heavy metals

Abstract: Lead(II) and cadmium(II) were determined by a flow-based analysis with spectrophotometric detection. Quercetin (Querc) and cetyltrimethylammonium bromide (CTAB) were used as a complexing agent and a surfactant, respectively. The absorbance of the yellow-colored complexes (Pb-Querc and Cd-Querc) were measured in Tris(hydroxymethyl)aminomethane buffer (pH 8.9) within the wavelength of 420–470 nm. The optimal condition was obtained by using 800 mgL-1 quercetin reagent (20 μL) in solution with 3.0 × 10-3 mol·L-1 CTAB (150 μL). The sample solutions were determined by a sequential injection spectrophotometer using deionized water as a carrier. The linear relationship between absorbance and concentration of metals were obtained over the concentration range from 0.02-0.1 ppm for both Cd(II) and Pb(II). The limit of detection (LOD, defined as 3SD) of Cd(II) was 0.002 ppm and the limit of quantification (LOQ, defined as 10SD) was 0.008 ppm. The limit of detection (LOD, defined as 3SD) of Pb(II) was 0.002 ppm and the limit of quantification (LOQ, defined as 10SD) was 0.007 ppm. The relative standard deviations were 5.2% (n=7) and 2.3% (n=7) for 0.3 ppm Cd(II) and Pb(II), respectively. The optimal condition was applied with the developed device for the determination of Cd(II) and Pb(II) in water. The alternative light source, LED (light-emitting diode), was also used for a miniaturization purpose.

King Mongkut's University of Technology North Bangkok. Central Library

Address: BANGKOK

Email: library@kmutnb.ac.th

Created: 2016

Modified: 2562-10-04

Issued: 2019-10-04

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BibliograpyCitation : In Chemical Society of Thailand under the Patronage of Professor Dr. HRH Princess Chulabhorn and Chulalongkorn University Faculty of science. Pure and Applied Chemistry International Conference (PACCON 2016) (pp.20-31). Bangkok : Chemical Society of Thailand under the Patronage of Professor Dr. HRH Princess Chulabhorn

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