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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Development of Novel Turbidity Calibration Standards and Methodologies Using Appropriate Technology

Jonathan D Racey (6866849) 15 August 2019 (has links)
The measurement of turbidity is currently conducted using a variety of methodologies for different applications, primarily using calibration standards composed of formazin, a material which can be difficult to obtain, short-lived, and toxic. The discrepancies between the various measurement methods lead to unreliability in sharing meaningful data across applications, and the deficiencies of the primary calibration standard make it difficult to conduct measurements in appropriate-technology environments. This research focused on examining the current methodologies and synthesizing new materials to use as calibration standards. The selection criteria for these materials were such as to ensure longevity, stability in solution, and ease of creation. Results showed that dilutions of dissolved sodium chloride yielded parabolic regression curves of comparable accuracy to formazin, which could be used for device calibration. These standards can be easily and safely synthesized in appropriate-technology settings. The use of fluorescent materials as calibration standards was also investigated, and the implications of the characteristic curves of turbidity versus solute concentration are discussed.

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