An Automated Procedure for Laboratory and Shipboard Spectrophotometric Measurements of Seawater Alkalinity: Continuously Monitored Single-step Acid Additions

Xuewu Liu; Robert H. Byrne; Michael Lindemuth; Regina Easley; Jeremy T. Mathis

doi:10.1016/j.marchem.2015.06.008

An Automated Procedure for Laboratory and Shipboard Spectrophotometric Measurements of Seawater Alkalinity: Continuously Monitored Single-step Acid Additions

Xuewu Liu, Robert H. Byrne, Michael Lindemuth, Regina Easley, Jeremy T. Mathis

College of Marine Science

Research output: Contribution to journal › Article › peer-review

Abstract

Building on the spectrophotometric procedure of Yao and Byrne (1998), an automated analysis system has been developed for laboratory and shipboard measurements of total alkalinity at a rate of 6 samples per hour. The system is based on single-point hydrochloric acid (HCl) titrations of seawater samples of a known volume with bromocresol purple as an indicator. The titration is continuously monitored using visible spectroscopy to guide the titration rate according to the real-time pH of the samples. Each titration is terminated just below the equivalence point to achieve a precision and accuracy near 1 μmol kg ⁻¹ .

Original language	American English
Journal	Marine Chemistry
Volume	174
DOIs	https://doi.org/10.1016/j.marchem.2015.06.008
State	Published - Jan 1 2015

Keywords

Alkalinity
Seawater
Spectrophotometry
Indicator
CO2 system
Ocean acidification

Disciplines

Life Sciences

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10.1016/j.marchem.2015.06.008License: CC BY

https://doi.org/10.1016/j.marchem.2015.06.008

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title = "An Automated Procedure for Laboratory and Shipboard Spectrophotometric Measurements of Seawater Alkalinity: Continuously Monitored Single-step Acid Additions",

abstract = " Building on the spectrophotometric procedure of Yao and Byrne (1998), an automated analysis system has been developed for laboratory and shipboard measurements of total alkalinity at a rate of 6 samples per hour. The system is based on single-point hydrochloric acid (HCl) titrations of seawater samples of a known volume with bromocresol purple as an indicator. The titration is continuously monitored using visible spectroscopy to guide the titration rate according to the real-time pH of the samples. Each titration is terminated just below the equivalence point to achieve a precision and accuracy near 1 μmol kg −1 .",

keywords = "Alkalinity, Seawater, Spectrophotometry, Indicator, CO2 system, Ocean acidification",

author = "Xuewu Liu and Byrne, \{Robert H.\} and Michael Lindemuth and Regina Easley and Mathis, \{Jeremy T.\}",

year = "2015",

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doi = "10.1016/j.marchem.2015.06.008",

language = "American English",

volume = "174",

journal = "Marine Chemistry",

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T1 - An Automated Procedure for Laboratory and Shipboard Spectrophotometric Measurements of Seawater Alkalinity: Continuously Monitored Single-step Acid Additions

AU - Liu, Xuewu

AU - Byrne, Robert H.

AU - Lindemuth, Michael

AU - Easley, Regina

AU - Mathis, Jeremy T.

PY - 2015/1/1

Y1 - 2015/1/1

N2 - Building on the spectrophotometric procedure of Yao and Byrne (1998), an automated analysis system has been developed for laboratory and shipboard measurements of total alkalinity at a rate of 6 samples per hour. The system is based on single-point hydrochloric acid (HCl) titrations of seawater samples of a known volume with bromocresol purple as an indicator. The titration is continuously monitored using visible spectroscopy to guide the titration rate according to the real-time pH of the samples. Each titration is terminated just below the equivalence point to achieve a precision and accuracy near 1 μmol kg −1 .

AB - Building on the spectrophotometric procedure of Yao and Byrne (1998), an automated analysis system has been developed for laboratory and shipboard measurements of total alkalinity at a rate of 6 samples per hour. The system is based on single-point hydrochloric acid (HCl) titrations of seawater samples of a known volume with bromocresol purple as an indicator. The titration is continuously monitored using visible spectroscopy to guide the titration rate according to the real-time pH of the samples. Each titration is terminated just below the equivalence point to achieve a precision and accuracy near 1 μmol kg −1 .

KW - Alkalinity

KW - Seawater

KW - Spectrophotometry

KW - Indicator

KW - CO2 system

KW - Ocean acidification

UR - https://digitalcommons.usf.edu/msc_facpub/1780

UR - https://doi.org/10.1016/j.marchem.2015.06.008

U2 - 10.1016/j.marchem.2015.06.008

DO - 10.1016/j.marchem.2015.06.008

M3 - Article

VL - 174

JO - Marine Chemistry

JF - Marine Chemistry

ER -

An Automated Procedure for Laboratory and Shipboard Spectrophotometric Measurements of Seawater Alkalinity: Continuously Monitored Single-step Acid Additions

Abstract

Keywords

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