HPLC-DAD Purification and Characterization of Meta-Cresol-Purple for Spectrophotometric Seawater pH Measurements

Rivaro, Paola; Vivado, Davide; Falco, Pierpaolo; Ianni, Carmela

doi:10.3390/w13213030

Cited by 2 publications

(1 citation statement)

References 19 publications

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“…They further showed that the differences could be attributed to impurities in the indicator dye solutions that result in lower measured pH T . Liu et al (2011) and Rivaro et al (2021) used high performance liquid chromatography (HPLC) and Patsavas et al (2013) used flash chromatography to purify indicator dyes from a variety of manufacturers and showed that a single research group could purify indicator dyes from multiple sources and produce a consistent product. More recently, Takeshita et al (2021) organized an inter‐laboratory comparison of purified mCP indicator dyes and found that seven of nine batches of purified indicator dye obtained from four suppliers across two countries produced pH T measurements that agreed within 0.003 across pH T values, while two of nine batches produced quantifiably different pH T values (attributed to remaining impurities).…”

Section: Uncertainty Sources By Measurable Variablementioning

confidence: 99%

Uncertainty sources for measurable ocean carbonate chemistry variables

Carter,

Sharp,

Dickson

et al. 2023

Limnology & Oceanography

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The ocean carbonate system is critical to monitor because it plays a major role in regulating Earth's climate and marine ecosystems. It is monitored using a variety of measurements, and it is commonly understood that all components of seawater carbonate chemistry can be calculated when at least two carbonate system variables are measured. However, several recent studies have highlighted systematic discrepancies between calculated and directly measured carbonate chemistry variables and these discrepancies have large implications for efforts to measure and quantify the changing ocean carbon cycle. Given this, the Ocean Carbonate System Intercomparison Forum (OCSIF) was formed as a working group through the Ocean Carbon and Biogeochemistry program to coordinate and recommend research to quantify and/or reduce uncertainties and disagreements in measurable seawater carbonate system measurements and calculations, identify unknown or overlooked sources of these uncertainties, and provide recommendations for making progress on community efforts despite these uncertainties. With this paper we aim to (1) summarize recent progress toward quantifying and reducing carbonate system uncertainties; (2) advocate for research to further reduce and better quantify carbonate system measurement uncertainties; (3) present a small amount of new data, metadata, and analysis related to uncertainties in carbonate system measurements; and (4) restate and explain the rationales behind several OCSIF recommendations. We focus on open ocean carbonate chemistry, and caution that the considerations we discuss become further complicated in coastal, estuarine, and sedimentary environments.

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