High precision multiwavelength pH determinations in seawater using cresol red

Byrne, Robert H.; Breland, Jabe A.

doi:10.1016/0198-0149(89)90152-0

Cited by 139 publications

(79 citation statements)

References 4 publications

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“…These estimates are performed using the precise spectrophotometric dye methods developed by Robert-Baldo et al [1985] and Byrne and Breland [1989] and modified from Clayton and Byrne [1993] and Breland and Byrne [1993]. A single-beam spectrophotometer (Ocean Optics) was used.…”

Section: Methodsmentioning

confidence: 99%

Annual cycle of primary production in the Cariaco Basin: Response to upwelling and implications for vertical export

Muller‐Karger¹,

Varela²,

Thunell³

et al. 2001

J. Geophys. Res.

156

118

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at 1225 m, with no seasonality in the proportion of vertical flux to primary production. In total, between 10 and 11 gC m -2 yr-*were delivered to the bottom sediment of Cariaco, which suggests that between 4 x l0 s and 1 x 10 6 t of C yr -• were delivered to sediments within the upwelling area of the Cariaco Basin. This represents permanent sequestration of carbon previously entrained in the North Atlantic gyre in the area of formation of SUW. Results suggests that upwelled inorganic nitrogen, rather than nitrogen fixation, is responsible for the large productivity and particulate carbon settling flux in the Cariaco Basin.

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Section: Methodsmentioning

confidence: 99%

Annual cycle of primary production in the Cariaco Basin: Response to upwelling and implications for vertical export

Muller‐Karger¹,

Varela²,

Thunell³

et al. 2001

J. Geophys. Res.

156

118

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show abstract

“…These products have numerous applications, [35][36][37][38][39][40][41] often in biological and medical fields. [42][43][44][45][46][47][48][49][50][51][52][53] Sulfonphtaleine dyes are not only sensitive to pH, but are also used in sensor applictions for detecting pesticides, CO 2 and ammonia. [54][55][56] The development of new glassy carbon electrodes also deserves mention.…”

Section: Introductionmentioning

confidence: 99%

Substituent effects on absorption spectra of pH indicators: An experimental and computational study of sulfonphthaleine dyes

Meyer

Hemelsoet²,

Speybroeck³

et al. 2014

Dyes and Pigments

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Sulfonphthaleine dyes are an important class of pH indicators, finding applications in novel (textile) sensors. In this paper, we present a combined experimental and theoretical study to elucidate the halochromic behaviour of a large set of sulfonphthaleine compounds. Starting from an experimental analysis consisting of UV/Vis spectroscopy, the pH region and the absorption wavelengths related to the colour shift are obtained and pK a values are derived. The effect of the substituents on the pH region can be traced back to their electron donating/withdrawing properties. Time-Dependent Density Functional Theory (TD-DFT) is able to adequately produce the trend in experimental wavelengths. Proton affinities are used to assess the effect of substituents on the pH region. The combination of theory and experiment is able to give a better understanding of the pH sensitivity; the methodology in this work will be useful in future dye design and is applicable to other dye classes as well.

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“…For cruises A6 and A7, we were unable to find the appropriate metadata describing how the alkalinities were measured. The pH measurements were done by electrode, spectrophotometric, or potentiometric determination (Byrne and Breland 1989). Discrete fCO 2 was measured by equilibration of a discrete sample with a headspace with known initial concentration and by subsequent IR analysis (Wanninkhof and Thoning 1993) or gas chromatography (Chipman, Marra, andTakahashi 1993, Neil et al 1997).…”

Section: Introductionmentioning

confidence: 99%

Comparison of Inorganic Carbon System Parameters Measured in the Atlantic Ocean from 1990 to 1998 and Recommended Adjustments

Wanninkhof¹

2003

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High precision multiwavelength pH determinations in seawater using cresol red

Cited by 139 publications

References 4 publications

Annual cycle of primary production in the Cariaco Basin: Response to upwelling and implications for vertical export

Annual cycle of primary production in the Cariaco Basin: Response to upwelling and implications for vertical export

Substituent effects on absorption spectra of pH indicators: An experimental and computational study of sulfonphthaleine dyes

Comparison of Inorganic Carbon System Parameters Measured in the Atlantic Ocean from 1990 to 1998 and Recommended Adjustments

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