Skates V.W.L., van Hal R.E.G.
Schlumberger-Doll Research, US
Keywords: colorimetry, hydrogen sulfide, nanoparticles, sensor
This paper provides a novel colorimetric method to measure hydrogen sulfide in water, air, natural gas and oil. A bismuth ion based reagent reacts with sulfide to form bismuth sulfide nanoparticles, causing the solution to change color. The bismuth sulfide nanoparticles formed have limited quantum confinement effects and are kept in colloidal solution using the soluble polymer poly(acrylic acid). A linear relation between optical density and hydrogen sulfide concentration is observed, and it is proven that the reagent is reproducible and independent of the reaction environment. The lower limit of detection is dictated by the resolution of the optical spectrometer, and the upper limit is determined by the bismuth ion concentration in the reagent. This measurement range can be extended by using longer optical pathlengths or by changing the mixing ratio of reagent to sample.
Journal: TechConnect Briefs
Volume: TechConnect Briefs 2019
Published: June 17, 2019
Pages: 318 - 321
Industry sector: Sensors, MEMS, Electronics
Topics: Nanoelectronics, Sensors - Chemical, Physical & Bio
ISBN: 978-0-9988782-8-7