Evaluation of reagentless pH modification for in situ ocean analysis: determination of dissolved inorganic carbon using mass spectrometry

Cardenas-Valencia, Andres M.; Adornato, Lori; Bell, Ryan J.; Byrne, Robert H.; Short, R.T.

doi:10.1002/rcm.6487

Cited by 5 publications

(8 citation statements)

References 30 publications

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“…More recent efforts from the SRI group have focused on obtaining in situ measurements of total DIC and carbon (Bell et al, 2011;Cardenas-Valencia et al, 2013). DIC is a CO 2 system variable which, along with alkalinity, controls seawater pH, carbonate saturation state, and CO 2 fugacity.…”

Section: Usf and Sri Systemsmentioning

confidence: 99%

“…MIMS CO 2 fugacity measurements were accurate to within 0.2% of certified reference standard values, but given that the standard deviation was 1.5%, the instrumental precision was too low for many carbon system measurements which require standard deviations lower than 1%. In order to eliminate the need for strong acids and associated mechanical pumps and reagent reservoirs in DIC measurements, Cardenas-Valencia et al (2013) explored the feasibility of using in situ electrolysis to acidify samples during field measurements. Calibration curves obtained with this novel reagentless technique were similar to those obtained with the in-line strong acid addition technique.…”

Section: Usf and Sri Systemsmentioning

confidence: 99%

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A Review of the Emerging Field of Underwater Mass Spectrometry

et al. 2016

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Mass spectrometers are versatile sensor systems, owing to their high sensitivity and ability to simultaneously measure multiple chemical species. Over the last two decades, traditional laboratory-based membrane inlet mass spectrometers have been adapted for underwater use. Underwater mass spectrometry (UMS) has drastically improved our capability to monitor a broad suite of gaseous compounds (e.g., dissolved atmospheric gases, light hydrocarbons, and volatile organic compounds) in the aquatic environment. Here we provide an overview of the progress made in the field of UMS since its inception in the 1990s to the present. In particular, we discuss the approaches undertaken by various research groups in developing in situ mass spectrometers. We also provide examples to illustrate how underwater mass spectrometers have been used in the field. Finally, we present future trends in the field of in situ mass spectrometry. Most of these efforts are aimed at improving the quality and spatial and temporal scales of chemical measurements in the ocean. By providing up-to-date information on UMS, this review offers guidance for researchers interested in adapting this technology as well as goals for future progress in the field.

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Section: Usf and Sri Systemsmentioning

confidence: 99%

Section: Usf and Sri Systemsmentioning

confidence: 99%

A Review of the Emerging Field of Underwater Mass Spectrometry

et al. 2016

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“…Petroleum products have been measured to ppm levels in aqueous environments via MIMS [19]. Other investigations have been conducted to examine the properties of MIMS for use in water quality monitoring [20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Development of Multi-Membrane Near-Infrared Diode Mass Spectrometer for Field Analysis of Aromatic Hydrocarbons

Mach

Wright

Verbeck

2014

J. Am. Soc. Mass Spectrom.

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Abstract. Membrane Inlet Mass Spectrometry (MIMS) is a technique that incorporates a semi-permeable membrane selective for differing organic molecules and chemistries. This eliminates the need for time-consuming sample preparation and facilitates near instantaneous analysis. This study will examine how the front end of MIMS incorporates three dual inlet ports, allowing for differing MIMS materials and selectivity for specific environments. Polydimethylsiloxane (PDMS) membranes have proven to be selective of benzene, toluene, and xylene (BTX) as well as aromatic hydrocarbons that are common in petroleum products while remaining selective against the aliphatic chains. PDMS has proven to be a successful choice of membrane with high permeability in atmospheric environments. In addition, polycyclic aromatic hydrocarbons (PAHs) such as acenaphthene, acenapthylene, naphthalene, and fluorene have recently been detected to the 5 ppb level in a nitrogen atmosphere with our current configuration. This preliminary work provides proof of concept using near-infrared laser diodes that act upon the membrane to increase its permeability and provide higher sensitivity of aromatic samples.

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“…(4) Mass spectrometry. 12,13 A membrane inlet mass spectrometer is used for measurement of dissolved CO 2 gas aer acidifying seawater to pH < 3. (5) Isotope dilution.…”

Section: Introductionmentioning

confidence: 99%

“…(5) Isotope dilution. 14 A seawater sample and a 13 C-labeled sodium bicarbonate solution are mixed; then the mixed solution is acidied and sent through a gas permeable membrane contactor, and the released CO 2 rst extracted using a CO 2 -free gas stream, and then passed into a cavity ring-down spectrometer to determine its isotope ratio. Furthermore, several systems based on ow injection analysis have been developed in the past years for automated measurements of [DIC].…”

Section: Introductionmentioning

confidence: 99%

A simplified coulometric method for multi-sample measurements of total dissolved inorganic carbon concentration in marine waters

Amornthammarong

Ortner

Hendee

et al. 2014

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A new system requiring greatly reduced operator intervention has been developed for the determination of dissolved inorganic carbon concentration in marine waters. Based on a coulometric method, the system has an accuracy and precision comparable to more complex and expensive methods currently employed. A syringe pump equipped with a 12-port distribution valve is used to precisely dispense an acid solution and sample into a gas stripper. The system can autonomously measure eight discrete samples in duplicate or triplicate with no operator input. The best precision (%RSD) obtained was 0.022% (n = 14) or less than ±1.0 μmol kg(-1). The system is calibrated against a certified reference material (CRM). Average offset from the CRM was 1.2 μmol kg(-1). Sample throughput was 4 samples per h. Carryover effects are negligible but field sample analyses suggest that prefiltering may be necessary in highly turbid waters.

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Evaluation of reagentless pH modification for in situ ocean analysis: determination of dissolved inorganic carbon using mass spectrometry

Cited by 5 publications

References 30 publications

A Review of the Emerging Field of Underwater Mass Spectrometry

A Review of the Emerging Field of Underwater Mass Spectrometry

Development of Multi-Membrane Near-Infrared Diode Mass Spectrometer for Field Analysis of Aromatic Hydrocarbons

A simplified coulometric method for multi-sample measurements of total dissolved inorganic carbon concentration in marine waters

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