Development of a Paper Test Strip for Detection of Lead

Siriwan Teepoo, Sunisa Meenon

Abstract


Abstract

This research was the development of paper test for lead detection based on the reaction between lead and alizarin red S resulting in reddish brown product. Then reddish brown intensity was measured by image processing program. The paper test was fabricated by screening the polylacetic acid solution on chromatography paper using screen-printing technique to create hydrophobic barriers on paper. The optimum conditions of paper test for detection of lead were studied such as mole ratio of alizarin red S, pH value and reaction time between lead and alizarin red S. The results were found that the optimum concentration of alizarin red S was 14 mM. The pH value of 4.00 and the reaction time of 1 min were obtained for optimization of the reaction between lead and alizarin red S. Under optimal conditions, the color intensity was linearly correlated with concentration of lead in the range of 0.08 to 2.00 ppm. The detection limit was 0.06 ppm and %recovery was 87-116. The advantage, of the developed paper test strip were high accuracy and precision, easy to use, short analysis time.

 

Keywords :  lead, paper test strip, chromatography paper, alizarin red S


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References


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