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Calibration-free Spectrophotometric ...

Cuyler, Erin E.

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

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Calibration-free Spectrophotometric Measurements of Carbonate Saturation States in Seawater./
作者:	Cuyler, Erin E.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2017,
面頁冊數:	71 p.
附註:	Source: Masters Abstracts International, Volume: 57-02.
Contained By:	Masters Abstracts International57-02(E).
標題:	Chemical oceanography. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10640247
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. - Ann Arbor : ProQuest Dissertations & Theses, 2017 - 71 p.

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

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

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.

ISBN: 9780355482287Subjects--Topical Terms:

516760
Chemical oceanography.

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