Presentation Title

Smartphone Colorimetric pH Determination of Water Samples

Faculty Mentor

Dr. Yan Liu

Start Date

23-11-2019 8:00 AM

End Date

23-11-2019 8:45 AM

Location

213

Session

poster 1

Type of Presentation

Poster

Subject Area

physical_mathematical_sciences

Abstract

Water and its pH value are important abiotic factors that affect the functioning of ecosystems. Due to the pollutions, the quality of environmental water is declining and its pH is changing in the past decade. Although a pH meter is generally used to determine the pH of environmental water samples in the laboratories, a rapid and accurate method for the determination of pH value is still desired in the remote field study when the power sources are limited. Traditionally, pH indicators and pH paper are used for on-site determination for the range of pH value. Only semi-quantitative pH values, however, can be obtained by pH indicators and pH paper due to the subtle changes in their colors. In this study, the color intensity of pH indicators and the pH paper are read digitally using a smartphone. Bromothymol blue, a pH indicator, and MColorpHastTM strips, the pH paper, were both used in the pH measurement for the standard phosphate buffers ranging from pH 1.0 to pH 14.0. The color intensity of both were read digitally and measured in terms of Red, Green, and Blue (RGB) values with a smartphone App, ColorName. Preliminary data were used to construct calibration curves for bromothymol blue and MColorpHastTMstrips with the R^2value of 0.99 for bromothymol blue and 0.94 for pH paper, respectively. Real environmental water samples will be tested with more optimization on testing conditions.

This document is currently not available here.

Share

COinS
 
Nov 23rd, 8:00 AM Nov 23rd, 8:45 AM

Smartphone Colorimetric pH Determination of Water Samples

213

Water and its pH value are important abiotic factors that affect the functioning of ecosystems. Due to the pollutions, the quality of environmental water is declining and its pH is changing in the past decade. Although a pH meter is generally used to determine the pH of environmental water samples in the laboratories, a rapid and accurate method for the determination of pH value is still desired in the remote field study when the power sources are limited. Traditionally, pH indicators and pH paper are used for on-site determination for the range of pH value. Only semi-quantitative pH values, however, can be obtained by pH indicators and pH paper due to the subtle changes in their colors. In this study, the color intensity of pH indicators and the pH paper are read digitally using a smartphone. Bromothymol blue, a pH indicator, and MColorpHastTM strips, the pH paper, were both used in the pH measurement for the standard phosphate buffers ranging from pH 1.0 to pH 14.0. The color intensity of both were read digitally and measured in terms of Red, Green, and Blue (RGB) values with a smartphone App, ColorName. Preliminary data were used to construct calibration curves for bromothymol blue and MColorpHastTMstrips with the R^2value of 0.99 for bromothymol blue and 0.94 for pH paper, respectively. Real environmental water samples will be tested with more optimization on testing conditions.