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פותח על ידי קלירמאש פתרונות בע"מ -
An improved microextraction technique for measuring dissolved inorganic carbon (DIC), δ13CDIC and δ18OH2O from milliliter-size water samples
Year:
1991
Source of publication :
Chemical Geology
Authors :
גרבר, אלן
;
.
Volume :
94
Co-Authors:

Aharon, P.

Facilitators :
From page:
137
To page:
144
(
Total pages:
8
)
Abstract:

Dissolved inorganic carbon (DIC), δ 13CDIC and δ 18IH2O are traditionally measured using three different analytical techniques. Herein is described a precise, accurate and relatively simple technique for analyzing all three parameters from a single S 2-ml water sample.

Water samples are injected through a septum into a temperature-controlled, water-jacketed, evacuated vessel containing ∼ 0.3 ml of orthophosphoric acid and a magnetic spinbar. The extraction line and vessel are coupled directly to the inlet of the mass spectrometer. Evolved CO2 is drawn through two −90°C traps to separate water vapor, and CO2 is condensed into a liquid-nitrogen trap. Yields of 98–100% are achieved by using a capillary tube between the reaction vessel and traps, dynamic “cold” pumping with liquid nitrogen, acidification to < 1 pH unit, and vigorous stirring. DIC is measured as a function of the voltage produced by mass 44 of the CO2 gas in a fixed volume, and CO2 is then analyzed for δ 13CDIC and δ 18OH2O using conventional mass spectrometry techniques. A correction factor of −1.10%o is applied to δ 18O-aqueous in order to compare it with δ 18O-vapor measured by the conventional Epstein-Mayeda method.

The method is fast (45 min. per sample), reproducible (standard deviation DIC= ± 0.1 mmol l−1; standard deviation δ 13CDIC and δ 18OH2O= ± 0.1‰), and accurate down to 1 mmol l−1. It represents a considerable refinement over existing methods, and is especially valuable for studies in which sample size is a limiting factor. It can also replace the more cumbersome conventional methods where sample size is no object.

Note:
Related Files :
Dissolved inorganic carbon
soil
water
עוד תגיות
תוכן קשור
More details
DOI :
https://doi.org/10.1016/0168-9622(91)90006-I
Article number:
0
Affiliations:
Database:
גוגל סקולר
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
38295
Last updated date:
02/03/2022 17:27
Creation date:
06/12/2018 14:56
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Scientific Publication
An improved microextraction technique for measuring dissolved inorganic carbon (DIC), δ13CDIC and δ18OH2O from milliliter-size water samples
94

Aharon, P.

An improved microextraction technique for measuring dissolved inorganic carbon (DIC), δ13CDIC and δ18OH2O from milliliter-size water samples

Dissolved inorganic carbon (DIC), δ 13CDIC and δ 18IH2O are traditionally measured using three different analytical techniques. Herein is described a precise, accurate and relatively simple technique for analyzing all three parameters from a single S 2-ml water sample.

Water samples are injected through a septum into a temperature-controlled, water-jacketed, evacuated vessel containing ∼ 0.3 ml of orthophosphoric acid and a magnetic spinbar. The extraction line and vessel are coupled directly to the inlet of the mass spectrometer. Evolved CO2 is drawn through two −90°C traps to separate water vapor, and CO2 is condensed into a liquid-nitrogen trap. Yields of 98–100% are achieved by using a capillary tube between the reaction vessel and traps, dynamic “cold” pumping with liquid nitrogen, acidification to < 1 pH unit, and vigorous stirring. DIC is measured as a function of the voltage produced by mass 44 of the CO2 gas in a fixed volume, and CO2 is then analyzed for δ 13CDIC and δ 18OH2O using conventional mass spectrometry techniques. A correction factor of −1.10%o is applied to δ 18O-aqueous in order to compare it with δ 18O-vapor measured by the conventional Epstein-Mayeda method.

The method is fast (45 min. per sample), reproducible (standard deviation DIC= ± 0.1 mmol l−1; standard deviation δ 13CDIC and δ 18OH2O= ± 0.1‰), and accurate down to 1 mmol l−1. It represents a considerable refinement over existing methods, and is especially valuable for studies in which sample size is a limiting factor. It can also replace the more cumbersome conventional methods where sample size is no object.

Scientific Publication
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