ISO‐CADICA: Isotopic – continuous, automated dissolved inorganic carbon analyser

Bass, Adrian M.; Bird, Michael I.; Munksgaard, Niels C.; Wurster, Christopher M.

doi:10.1002/rcm.6143

Cited by 31 publications

(28 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…DIC and d 13 C DIC was measured using the Isotopic Continuous Dissolved Inorganic Carbon Analyser (ISO-CADICA). A full description of the ISO-CADICA system has been presented by Bass et al (2012b). The ISO-CADICA records DIC concentration to AE 0.12 mg l À1 and d 13 C DIC to AE0.2 %.…”

Section: Data Collectionmentioning

confidence: 99%

“…Johnson et al . () developed a system that continuously records pCO 2 , and instruments to measure DIC in both ocean (Sayles and Eck., ) and fluvial environments (Bass et al ., , ) have been described. These advances in measurement capability, coupled to existing automated data loggers for various hydrological and hydrochemical parameters, are enabling high‐resolution carbon budgets to be calculated in small, hydrologically responsive systems.…”

Section: Introductionmentioning

confidence: 97%

See 1 more Smart Citation

Contrasting carbon export dynamics of human impacted and pristine tropical catchments in response to a short‐lived discharge event

Bass

Munksgaard

Leblanc

et al. 2013

Hydrological Processes

Self Cite

View full text Add to dashboard Cite

Abstract:Utilising newly available instrumentation, the carbon balance in two small tropical catchments was measured during two discharge events at high temporal resolution. Catchments share similar climatic conditions, but differ in land use with one draining a pristine rainforest catchment, the other a fully cleared and cultivated catchment. The necessity of high resolution sampling in small catchments was illustrated in each catchment, where significant chemical changes occurred in the space of a few hours or less. Dissolved and particulate carbon transport dominated carbon export from the rainforest catchment during high flow, but was surpassed by degassing of CO 2 less than 4 h after the discharge peak. In contrast, particulate organic carbon dominated export from the cleared catchment, in all flow conditions with CO 2 evasion accounting for 5-23% of total carbon flux. Stable isotopes of dissolved inorganic carbon (DIC) in the ephemeral rainforest catchment decreased quickly from~1.5 % to~À16 % in 5 h from the flood beginning. A two-point mixing model revealed that in the initial pulse, over 90% of the DIC was of rainwater origin, decreasing to below 30% in low flow. In the cultivated catchment, d13 C DIC values varied significantly less (À11.0 to À12.2 %) but revealed a complex interaction between surface runoff and groundwater sources, with groundwater DIC becoming proportionally more important in high flow, due to activation of macropores downstream. This work adds to an increasing body of work that recognises the importance of rapid, short-lived hydrological events in low-order catchments to global carbon dynamics.

show abstract

Section: Data Collectionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Contrasting carbon export dynamics of human impacted and pristine tropical catchments in response to a short‐lived discharge event

Bass

Munksgaard

Leblanc

et al. 2013

Hydrological Processes

Self Cite

View full text Add to dashboard Cite

show abstract

“…This suggests that headspace equilibrium post‐acidified sample collection is a valid method to estimate the δ 13 C DIC value and [DIC]. Multiple standard calibration seems to be more prevalent in other approaches to measuring [DIC] by CF‐IRMS, but only two other groups (Table ) have utilised linear regression of aqueous DIC standards to correct values of δ 13 C DIC . St‐Jean used linear regression (personal communication) but the system that he developed allows contemporaneous measurement of δ 13 C DIC and δ 13 C DOC values and thus he used DOC standards to avoid the problems of change in composition of DIC standards over time.…”

Section: Resultsmentioning

confidence: 99%

Quantifying precision and accuracy of measurements of dissolved inorganic carbon stable isotopic composition using continuous-flow isotope-ratio mass spectrometry

Waldron

Scott

Vihermaa

et al. 2014

Rapid Commun. Mass Spectrom.

View full text Add to dashboard Cite

RATIONALEWe describe an analytical procedure that allows sample collection and measurement of carbon isotopic composition (δ13CV-PDB value) and dissolved inorganic carbon concentration, [DIC], in aqueous samples without further manipulation post field collection. By comparing outputs from two different mass spectrometers, we quantify with the statistical rigour uncertainty associated with the estimation of an unknown measurement. This is rarely undertaken, but it is needed to understand the significance of field data and to interpret quality assurance exercises.METHODSImmediate acidification of field samples during collection in evacuated, pre-acidified vials removed the need for toxic chemicals to inhibit continued bacterial activity that might compromise isotopic and concentration measurements. Aqueous standards mimicked the sample matrix and avoided headspace fractionation corrections. Samples were analysed using continuous-flow isotope-ratio mass spectrometry, but for low DIC concentration the mass spectrometer response could be non-linear. This had to be corrected for.RESULTSMass spectrometer non-linearity exists. Rather than estimating precision as the repeat analysis of an internal standard, we have adopted inverse linear calibrations to quantify the precision and 95% confidence intervals (CI) of the δ13CDIC values. The response for [DIC] estimation was always linear. For 0.05–0.5 mM DIC internal standards, however, changes in mass spectrometer linearity resulted in estimations of the precision in the δ13CVPDB value of an unknown ranging from ± 0.44‰ to ± 1.33‰ (mean values) and a mean 95% CI half-width of ±1.1–3.1‰.CONCLUSIONSMass spectrometer non-linearity should be considered in estimating uncertainty in measurement. Similarly, statistically robust estimates of precision and accuracy should also be adopted. Such estimations do not inhibit research advances: our consideration of small-scale spatial variability at two points on a small order river system demonstrates field data ranges larger than the precision and uncertainties. However, without such statistical quantification, exercises such as inter-lab calibrations are less meaningful.

show abstract

“…In situ procedures for determining DIC generally involve the acidification of seawater to pH <3, whereupon more than 99.9% of DIC is in the form of CO 2 * (the sum of dissolved CO 2 gas in solution and aqueous H 2 CO 3 ). This procedure is exploited in essentially all DIC measurement techniques, including coulometry, manometry, spectrophotometry, mass spectrometry, and cavity ring down spectrometry . Bell et al .…”

Section: Need and Rationalementioning

confidence: 99%

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

Cardenas-Valencia

Adornato

Bell³

et al. 2013

Rapid Comm Mass Spectrometry

View full text Add to dashboard Cite

show abstract

ISO‐CADICA: Isotopic – continuous, automated dissolved inorganic carbon analyser

Cited by 31 publications

References 15 publications

Contrasting carbon export dynamics of human impacted and pristine tropical catchments in response to a short‐lived discharge event

Contrasting carbon export dynamics of human impacted and pristine tropical catchments in response to a short‐lived discharge event

Quantifying precision and accuracy of measurements of dissolved inorganic carbon stable isotopic composition using continuous-flow isotope-ratio mass spectrometry

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

Contact Info

Product

Resources

About