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Monitoring Acid–Base Titrations on Wax Printed Paper Microzones Using a Smartphone
Monitoring Acid–Base Titrations on Wax Printed Paper Microzones Using a Smartphone
- Source :
- Micromachines, Micromachines; Volume 8; Issue 5; Pages: 139, Micromachines, Vol 8, Iss 5, p 139 (2017)
- Publication Year :
- 2017
- Publisher :
- MDPI, 2017.
-
Abstract
- This study describes the use of a smartphone for monitoring acid–base titrations on wax printed paper microzones. An array of twelve microzones of 5 mm diameter each was wax printed on filter paper. The analytical performance of the proposed devices was explored with acid–base titrations examples, where jaboticaba peel extract was used as a natural pH indicator. The color intensity was captured using a smartphone and analyzed through a free App named Photometrix®. Before titrations, color intensity versus pH was calibrated to be used as a reference in titrations as (i) strong acid versus strong base; (ii) strong base versus strong acid; and (iii) weak acid versus strong base. In all examples, images were obtained after the addition of each aliquot of titrant solutions. The obtained titration curves showed the same behavior as the conventional titration curves. After evaluating the feasibility of the proposed methodology, the concentration level of acetic acid was obtained in three vinegar samples. Although the obtained values ranged from 5% to 8% compared to the concentrations on the conventional method, the proposed methodology presented high analytical reliability. The calculated concentrations of acetic acid in three samples ranged from 3.87% to 3.93%, and the proposed methodology did not significantly differ from classic acid–base titration at a confidence level of 95%. The acid–base titration on paper-based devices is outstanding, since any titration can be completed within 5 min using 20 µL volumes. Besides, the use of a smartphone to capture images followed by analysis in a free app offers simplicity to all users. The proposed methodology arises as a new strand to be exploited in the diffusion of the analytical chemistry education field as well as an alternative for quantitative analysis with extremely simplified instrumentation.
- Subjects :
- spot tests
Titration curve
lcsh:Mechanical engineering and machinery
Analytical chemistry
Acid–base titration
02 engineering and technology
chemical education
01 natural sciences
Article
Acetic acid
chemistry.chemical_compound
pH indicator
lcsh:TJ1-1570
microfluidic paper-based analytical devices
Electrical and Electronic Engineering
Wax
Filter paper
Mechanical Engineering
010401 analytical chemistry
cell-phone analysis
instrument-free chemical assays
paper microfluidics
021001 nanoscience & nanotechnology
0104 chemical sciences
chemistry
Control and Systems Engineering
visual_art
visual_art.visual_art_medium
Titration
0210 nano-technology
Quantitative analysis (chemistry)
Subjects
Details
- Language :
- English
- ISSN :
- 2072666X
- Volume :
- 8
- Issue :
- 5
- Database :
- OpenAIRE
- Journal :
- Micromachines
- Accession number :
- edsair.doi.dedup.....c29d9b24ee296819a6ece3464ef19886