An Ultrahigh Precision, High-Frequency Dissolved Inorganic Carbon Analyzer Based on Dual Isotope Dilution and Cavity Ring-Down Spectroscopy

2015 ◽  
Vol 49 (14) ◽  
pp. 8602-8610 ◽  
Author(s):  
Kuan Huang ◽  
Nicolas Cassar ◽  
Bror Jonsson ◽  
Wei-jun Cai ◽  
Michael L. Bender
Keyword(s):  
Isotope Dilution ◽  
High Frequency ◽  
Inorganic Carbon ◽  
Dissolved Inorganic Carbon ◽  
Cavity Ring Down Spectroscopy ◽  
Dual Isotope ◽  
Cavity Ring Down

scholarly journals Isotope Dilution Mass Spectrometry for Highly Precise Determination of Dissolved Inorganic Carbon in Seawater Aiming at Climate Change Studies

2018 ◽  
Vol 90 (7) ◽  
pp. 4677-4685 ◽  
Author(s):  
Laura Freije-Carrelo ◽  
Laura Alonso Sobrado ◽  
Mariella Moldovan ◽  
Jorge Ruiz Encinar ◽  
J. Ignacio García Alonso
Keyword(s):  
Climate Change ◽  
Mass Spectrometry ◽  
Isotope Dilution ◽  
Inorganic Carbon ◽  
Dissolved Inorganic Carbon ◽  
Isotope Dilution Mass Spectrometry ◽  
Precise Determination

scholarly journals Technical note: Coupling infrared gas analysis and cavity ring down spectroscopy for autonomous, high-temporal-resolution measurements of DIC and <i>δ</i><sup>13</sup>C–DIC

2017 ◽  
Vol 14 (5) ◽  
pp. 1305-1313 ◽  
Author(s):  
Mitchell Call ◽  
Kai G. Schulz ◽  
Matheus C. Carvalho ◽  
Isaac R. Santos ◽  
Damien T. Maher
Keyword(s):  
Temporal Resolution ◽  
Isotope Ratio ◽  
Inorganic Carbon ◽  
Dissolved Inorganic Carbon ◽  
Stable Isotope Ratio ◽  
Small Sample ◽  
High Temporal Resolution ◽  
Precision Data ◽  
Simple Method ◽  
Cavity Ring Down

Abstract. A new approach to autonomously determine concentrations of dissolved inorganic carbon (DIC) and its carbon stable isotope ratio (δ13C–DIC) at high temporal resolution is presented. The simple method requires no customised design. Instead it uses two commercially available instruments currently used in aquatic carbon research. An inorganic carbon analyser utilising non-dispersive infrared detection (NDIR) is coupled to a Cavity Ring-down Spectrometer (CRDS) to determine DIC and δ13C–DIC based on the liberated CO2 from acidified aliquots of water. Using a small sample volume of 2 mL, the precision and accuracy of the new method was comparable to standard isotope ratio mass spectrometry (IRMS) methods. The system achieved a sampling resolution of 16 min, with a DIC precision of ±1.5 to 2 µmol kg−1 and δ13C–DIC precision of ±0.14 ‰ for concentrations spanning 1000 to 3600 µmol kg−1. Accuracy of 0.1 ± 0.06 ‰ for δ13C–DIC based on DIC concentrations ranging from 2000 to 2230 µmol kg−1 was achieved during a laboratory-based algal bloom experiment. The high precision data that can be autonomously obtained by the system should enable complex carbonate system questions to be explored in aquatic sciences using high-temporal-resolution observations.

scholarly journals Major Effects of Alkalinity on the Relationship Between Metabolism and Dissolved Inorganic Carbon Dynamics in Lakes

Ecosystems ◽  
2020 ◽  
Vol 23 (8) ◽  
pp. 1566-1580 ◽  
Author(s):  
Hares Khan ◽  
Alo Laas ◽  
Rafael Marcé ◽  
Biel Obrador
Keyword(s):  
High Frequency ◽  
Inorganic Carbon ◽  
Dissolved Inorganic Carbon ◽  
Singular Spectrum Analysis ◽  
Automatic Monitoring ◽  
Carbon Dynamics ◽  
Metabolic Changes ◽  
Calcite Precipitation ◽  
Wide Range ◽  
The Relationship

AbstractSeveral findings suggest that CO2 emissions in lakes are not always directly linked to changes in metabolism but can be associated with interactions with the dissolved inorganic carbon equilibrium. Alkalinity has been described as a determining factor in regulating the relative contributions of biological and inorganic processes to carbon dynamics in lakes. Here we analyzed the relationship between metabolic changes in dissolved oxygen (DO) and dissolved inorganic carbon (DIC) at different timescales in eight lakes covering a wide range in alkalinity. We used high-frequency data from automatic monitoring stations to explore the sensitivity of DIC to metabolic changes inferred from oxygen. To overcome the problem of noisy data, commonly found in high-frequency measurements datasets, we used Singular Spectrum Analysis to enhance the diel signal-to-noise ratio. Our results suggest that in most of the studied lakes, a large part of the measured variability in DO and DIC reflects non-metabolic processes. Furthermore, at low alkalinity, DIC dynamics appear to be mostly driven by aquatic metabolism, but this relationship weakens with increasing alkalinity. The observed deviations from the metabolic 1:1 stoichiometry between DO and DIC were strongly correlated with the deviations expected to occur from calcite precipitation, with a stronger correlation when accounting also for the benthic contribution of calcite precipitation. This highlights the role of calcite precipitation as an important driver of CO2 supersaturation in lakes with alkalinity above 1 meq L−1, which represents 57% of the global area of lakes and reservoirs around the world.

scholarly journals TECHNICAL NOTE: Coupling infrared gas analysis and cavity ring down spectroscopy for autonomous, high temporal resolution measurements of DIC and δ<sup>13</sup>C-DIC

2016 ◽  
Author(s):  
Mitchell Call ◽  
Kai G. Schulz ◽  
Matheus C. Carvalho ◽  
Isaac R. Santos ◽  
Damien T. Maher
Keyword(s):  
Temporal Resolution ◽  
Isotope Ratio ◽  
Inorganic Carbon ◽  
Dissolved Inorganic Carbon ◽  
Stable Isotope Ratio ◽  
Small Sample ◽  
High Temporal Resolution ◽  
Precision Data ◽  
Simple Method ◽  
Cavity Ring Down

Abstract. A new approach to autonomously determine concentrations of dissolved inorganic carbon (DIC) and its carbon stable isotope ratio (δ13C-DIC) at high temporal resolution is presented. The simple method requires no customised design. Instead it uses two commercially available instruments currently used in aquatic carbon research. An inorganic carbon analyser utilising non-dispersive infrared detection (NDIR) is coupled to a Cavity Ring-down Spectrometer (CRDS) to determine DIC and δ13C-DIC based on the liberated CO2 from acidified aliquots of water. Using a small sample volume of 2 ml, the precision and accuracy of the new method was comparable to standard isotope ratio mass spectrometry (IRMS) methods. The system achieved a sampling resolution of 16 mins, with a DIC precision of ±1.5 to 2 µmol kg−1 and δ13C-DIC precision of ±0.14 ‰ for concentrations spanning 1000 to 3600 µmol kg−1. Accuracy of 0.1 ± 0.06 ‰ based on DIC concentrations ranging from 2000 µmol kg−1 to 2230 µmol kg−1 was achieved during a laboratory-based algal bloom experiment. The high precision data that can be autonomously obtained by the system should enable complex carbonate system questions to be explored in aquatic sciences using high temporal resolution observations.

High-Frequency Spectrophotometric Measurements of Total Dissolved Inorganic Carbon in Seawater

2013 ◽  
Vol 47 (14) ◽  
pp. 7840-7847 ◽  
Author(s):  
Zhaohui Aleck Wang ◽  
Sophie N. Chu ◽  
Katherine A. Hoering
Keyword(s):  
High Frequency ◽  
Inorganic Carbon ◽  
Dissolved Inorganic Carbon ◽  
Total Dissolved Inorganic Carbon
Sign in / Sign up

Export Citation Format

Share Document