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.

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 Determining the stable isotope ratio of total dissolved inorganic carbon in lake water by GC/C/IIRMS

1995 ◽  
Vol 40 (5) ◽  
pp. 994-1000 ◽  
Author(s):  
Toshihiro Miyajima ◽  
Yoshihiro Miyajima ◽  
Yuko T. Hanba ◽  
Koichi Yoshii ◽  
Tadatoshi Koitabashi ◽  
...  
Keyword(s):  
Stable Isotope ◽  
Lake Water ◽  
Isotope Ratio ◽  
Inorganic Carbon ◽  
Dissolved Inorganic Carbon ◽  
Stable Isotope Ratio ◽  
Total Dissolved Inorganic Carbon

scholarly journals A Simple Method for High Temporal Resolution Calcium Imaging with Dual Excitation Dyes

1998 ◽  
Vol 75 (4) ◽  
pp. 2025-2029 ◽  
Author(s):  
Luc Leybaert ◽  
James Sneyd ◽  
Michael J. Sanderson
Keyword(s):  
Temporal Resolution ◽  
Calcium Imaging ◽  
High Temporal Resolution ◽  
Simple Method

Stable isotope ratio analysis as a fast and simple method for identifying the origin of chitosan

2020 ◽  
Vol 101 ◽  
pp. 105516
Author(s):  
Matteo Perini ◽  
Tiziana Nardin ◽  
Matteo Venturelli ◽  
Silvia Pianezze ◽  
Roberto Larcher
Keyword(s):  
Stable Isotope ◽  
Isotope Ratio ◽  
Stable Isotope Ratio ◽  
Ratio Analysis ◽  
Simple Method ◽  
Isotope Ratio Analysis ◽  
Stable Isotope Ratio Analysis

scholarly journals Toward real-time measurement of atmospheric mercury concentrations using cavity ring-down spectroscopy

2010 ◽  
Vol 10 (6) ◽  
pp. 2879-2892 ◽  
Author(s):  
X. Faïn ◽  
H. Moosmüller ◽  
D. Obrist
Keyword(s):  
Temporal Resolution ◽  
Time Resolution ◽  
Pulse Repetition Frequency ◽  
Ambient Air ◽  
Atmospheric Mercury ◽  
Dye Laser ◽  
High Temporal Resolution ◽  
Cavity Ring Down Spectroscopy ◽  
Absorption Measurements ◽  
Cavity Ring Down

Abstract. Cavity ring-down spectroscopy (CRDS) is a direct absorption technique that utilizes path lengths up to multiple kilometers in a compact absorption cell and has a significantly higher sensitivity than conventional absorption spectroscopy. This tool opens new prospects for study of gaseous elemental mercury (Hg0) because of its high temporal resolution and reduced sample volume requirements (<0.5 l of sample air). We developed a new sensor based on CRDS for measurement of (Hg0) mass concentration. Sensor characteristics include sub-ng m−3 detection limit and high temporal resolution using a frequency-doubled, tuneable dye laser emitting pulses at ~253.65 nm with a pulse repetition frequency of 50 Hz. The dye laser incorporates a unique piezo element attached to its tuning grating allowing it to tune the laser on and off the Hg0 absorption line on a pulse-to-pulse basis to facilitate differential absorption measurements. Hg0 absorption measurements with this CRDS laboratory prototype are highly linearly related to Hg0 concentrations determined by a Tekran 2537B analyzer over an Hg0 concentration range from 0.2 ng m−3 to 573 ng m−3, implying excellent linearity of both instruments. The current CRDS instrument has a sensitivity of 0.10 ng Hg0 m−3 at 10-s time resolution. Ambient-air tests showed that background Hg0 levels can be detected at low temporal resolution (i.e., 1 s), but also highlight a need for high-frequency (i.e., pulse-to-pulse) differential on/off-line tuning of the laser wavelength to account for instabilities of the CRDS system and variable background absorption interferences. Future applications may include ambient Hg0 flux measurements with eddy covariance techniques, which require measurements of Hg0 concentrations with sub-ng m−3 sensitivity and sub-second time resolution.

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