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Calibration-free Spectrophotometric Measurements of Carbonate Saturation States in Seawater.

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	Calibration-free Spectrophotometric Measurements of Carbonate Saturation States in Seawater./
Author:	Cuyler, Erin E.
Description:	1 online resource (71 pages)
Notes:	Source: Masters Abstracts International, Volume: 57-02.
Subject:	Chemical oceanography. -
Online resource:	click for full text (PQDT)
ISBN:	9780355482287

Calibration-free Spectrophotometric Measurements of Carbonate Saturation States in Seawater.
Cuyler, Erin E.

Calibration-free Spectrophotometric Measurements of Carbonate Saturation States in Seawater. - 1 online resource (71 pages)

Source: Masters Abstracts International, Volume: 57-02.

Thesis (M.S.)--University of South Florida, 2017.

Includes bibliographical references

This work describes efforts to improve methodologies and instrumentation for investigation of the marine CO2 system. In the first section of my thesis, a method was developed that provides simple, calibration-free measurements of seawater carbonate saturation states (Ospec) based solely on the use of a laboratory spectrophotometer. Measurements of pH are made in paired optical cells, one with and one without added nitric acid. The amount of added nitric acid is determined through the direct proportionality between nitrate concentration and UV absorbance. After an initial calibration, the method is calibration-free and requires no volumetric or gravimetric analyses thereafter. Saturation state measurements can be obtained in twelve minutes and attain Global Ocean Acidification Observing Network accuracy goals over a wide range of conditions. This simple one-step measurement protocol is ideal for monitoring ocean acidification conditions in coastal areas, fish hatcheries and shellfish farms.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2018

Mode of access: World Wide Web

ISBN: 9780355482287Subjects--Topical Terms:

642003
Chemical oceanography.
Index Terms--Genre/Form:

554714
Electronic books.

Calibration-free Spectrophotometric Measurements of Carbonate Saturation States in Seawater.
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100 1 $a Cuyler, Erin E. $3 1186179
245 1 0 $a Calibration-free Spectrophotometric Measurements of Carbonate Saturation States in Seawater.
264 0 $c 2017
300 $a 1 online resource (71 pages)
336 $a text $b txt $2 rdacontent
337 $a computer $b c $2 rdamedia
338 $a online resource $b cr $2 rdacarrier
500 $a Source: Masters Abstracts International, Volume: 57-02.
500 $a Adviser: Robert H. Byrne.
502 $a Thesis (M.S.)--University of South Florida, 2017.
504 $a Includes bibliographical references
520 $a This work describes efforts to improve methodologies and instrumentation for investigation of the marine CO2 system. In the first section of my thesis, a method was developed that provides simple, calibration-free measurements of seawater carbonate saturation states (Ospec) based solely on the use of a laboratory spectrophotometer. Measurements of pH are made in paired optical cells, one with and one without added nitric acid. The amount of added nitric acid is determined through the direct proportionality between nitrate concentration and UV absorbance. After an initial calibration, the method is calibration-free and requires no volumetric or gravimetric analyses thereafter. Saturation state measurements can be obtained in twelve minutes and attain Global Ocean Acidification Observing Network accuracy goals over a wide range of conditions. This simple one-step measurement protocol is ideal for monitoring ocean acidification conditions in coastal areas, fish hatcheries and shellfish farms.
520 $a The second section of my thesis outlines the development of a next-generation handheld photometer for field measurements of seawater pH. The hand-held instrument is simple to use, inexpensive, and has a pH measurement accuracy of +/-0.01. Each photometer is calibrated by relating pH-indicator absorbance ratios (R B) obtained with the broadband photometer to indicator absorbance ratios (RN) obtained with a high quality, narrowband scanning spectrophotometer. The RB vs RN relationship for each photometer is entered into the instrument's software, providing discrete, real-time pH observations from measurements of RB, salinity and temperature. Measurement accuracy is assessed through comparisons of photometer pH with pH observations obtained using standard measurement procedures and high-quality spectrophotometers. The targeted user-groups for these instruments include middle and high school students, citizen scientists, and resource managers.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2018
538 $a Mode of access: World Wide Web
650 4 $a Chemical oceanography. $3 642003
655 7 $a Electronic books. $2 local $3 554714
690 $a 0403
710 2 $a ProQuest Information and Learning Co. $3 1178819
710 2 $a University of South Florida. $b Marine Science. $3 1186052
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10640247 $z click for full text (PQDT)