P639: Construction of a photometer as an instructional tool for electronics and instrumentation

Author: Robert L. McClain, University of Wisconsin-Madison, USA

Co-Author:

Date: 8/5/14

Time: 5:15 PM6:30 PM

Room: LIB

Related Symposium: S33

In this poster I will describe an introductory electronics laboratory unit for the undergraduate chemical instrumentation course. In this unit, students use basic electronic components to build a functioning photometer. Students interface the photometer to a microcontroller and write an Arduino program to collect the signal, calculate the absorbance and display the result on a liquid crystal display (LCD). Students use their home-built instruments to measure the concentration of hexavalent chromium in a water sample, and determine the figures of merit: sensitivity, detection limit, and dynamic range of the instrument.