In situ measurements of seawater pCO2

Spectrophotometric Determination of Formaldehyde in Seawater Samples after In-situ Derivatization and Dispersive Liquid-Liquid Microextraction

In this paper, a simple dispersive liquid-liquid microextraction for the extraction and pre-concentration of formaldehyde in seawater samples followed with spectrophotometric is proposed. Formaldehyde was derivatized in situ with acetyl acetone in the presence of ammonium acetate in a single step. Then it was collected into a mixture of ethanol (disperser solvent) and chloroform (extracting...

Application of Liquid Waveguide to Shipboard Underway and in Situ Low-level Nutrient Measurements in Seawater

Fluctuating seawater pH/pCO2 regimes are more energetically expensive than static pH/pCO2 levels in the mussel Mytilus edulis

Ocean acidification (OA) studies typically use stable open-ocean pH or CO2 values. However, species living within dynamic coastal environments can naturally experience wide fluctuations in abiotic factors, suggesting their responses to stable pH conditions may not be reflective of either present or near-future conditions. Here we investigate the physiological responses of the mussel Mytilus edu...

ESTIMATING GLOBAL CARBON TRENDS USING IN-SITU pCO2 OBSERVATIONS

While nearly half of total CO2 emissions over the last 50 years remain in the atmosphere, this fraction is subject to large year-to-year variability due to erratic land and ocean sink rates (Le Quéré et al. 2009). In order to investigate the tendency for oceanic CO2 uptake around the globe, long-term trends must be determined from available historical data. Recent studies of the North Atlantic ...

Calibration of an in situ membrane inlet mass spectrometer for measurements of dissolved gases and volatile organics in seawater.

Use of membrane inlet mass spectrometers (MIMS) for quantitative measurements of dissolved gases and volatile organics over a wide range of ocean depths requires characterization of the influence of hydrostatic pressure on the permeability of MIMS inlet systems. To simulate measurement conditions in the field, a laboratory apparatus was constructed for control of sample flow rate, temperature, ...