Application of a nested loop system for the flow injection analysis of trace aqueous peroxides

Dasgupta, Purnendu Κ.; Hwang, Hyonseok

doi:10.1021/ac00283a010

Cited by 63 publications

(27 citation statements)

References 21 publications

(8 reference statements)

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“…Further, if these data are to yield meaningful values of the desired parameters, the solutions used for such measurements should be such that all forms of the protolyzable anion are fully represented. Conductance of a C molar solution of M"_mHmX, derived from a n-protic acid (m = 0 -* n) can be generally expressed as 1000KG = (nm)CXM+ + [H+]Xh+ + [OH1Xoh-+ CQTl[ (Kai ... KJH+rtXtH^X-])] (10) i=l-*n and…”

mentioning

confidence: 99%

Measurement of acid dissociation constants of weak acids by cation exchange and conductometry

Dasgupta¹,

Nara²

1990

Anal. Chem.

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mentioning

confidence: 99%

Measurement of acid dissociation constants of weak acids by cation exchange and conductometry

Dasgupta¹,

Nara²

1990

Anal. Chem.

Self Cite

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“…Based on the previous developments, detection of NH + 4 was performed with the same fluorimetric method described in Sigg et al (1994) and Genfa and Dasgupta (1989). The detection of hydrogen peroxide and formaldehyde also used the previously developed methods, however with improved spectrometers (Dasgupta and Hwang, 1985;Dong and Dasgupta, 1987). Differing from the GRIP system, the EDC/NGRIP system used a more sensitive fluorimetric detection of Ca 2+ (Tsien et al, 1982) instead of the previously used absorption technique (Kagenow and Jensen, 1983).…”

Section: Ngrip Cfa Measurementsmentioning

confidence: 99%

High-resolution aerosol concentration data from the Greenland NorthGRIP and NEEM deep ice cores

Erhardt

Bigler

Federer

et al. 2022

Earth Syst. Sci. Data

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Abstract. Records of chemical impurities from ice cores enable us to reconstruct the past deposition of aerosols onto polar ice sheets and alpine glaciers. Through this they allow us to gain insight into changes of the source, transport and deposition processes that ultimately determine the deposition flux at the coring location. However, the low concentrations of the aerosol species in the ice and the resulting high risk of contamination pose a formidable analytical challenge, especially if long, continuous and highly resolved records are needed. Continuous flow analysis, CFA, the continuous melting, decontamination and analysis of ice-core samples has mostly overcome this issue and has quickly become the de facto standard to obtain high-resolution aerosol records from ice cores after its inception at the University of Bern in the mid-1990s. Here, we present continuous records of calcium (Ca2+), sodium (Na+), ammonium (NH4+), nitrate (NO3-) and electrolytic conductivity at 1 mm depth resolution from the NGRIP (North Greenland Ice Core Project) and NEEM (North Greenland Eemian Ice Drilling) ice cores produced by the Bern Continuous Flow Analysis group in the years 2000 to 2011 (Erhardt et al., 2021). Both of the records were previously used in a number of studies but were never published in full 1 mm resolution. Alongside the 1 mm datasets we provide decadal averages, a detailed description of the methods, relevant references, an assessment of the quality of the data and its usable resolution. Along the way we will also give some historical context on the development of the Bern CFA system. The data is available in full 1 mm and 10-year-averaged resolution on PANGAEA (https://doi.org/10.1594/PANGAEA.935838, Erhardt et al., 2021)

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“…Based on the previous developments, detection of NH + 4 was performed with the same fluorimetric method described in Sigg et al (1994) (Genfa and Dasgupta, 1989). The detection of hydrogen peroxide and formaldehyde also used the previously developed methods, however with improved spectrometers (Dasgupta and Hwang, 1985;Dong and Dasgupta, 1987). Differing from the GRIP system, the EDC/NGRIP system used a more sensitive fluorimetric detection of Ca 2+ (Tsien et al, 1982) instead of the previously used absorption technique (Kagenow and Jensen, 1983).…”

Section: Ngrip Cfa Measurementsmentioning

confidence: 99%

High resolution aerosol concentration data from the Greenland NorthGRIP and NEEM deep ice cores

Erhardt

Bigler

Federer

et al. 2021

Preprint

View full text Add to dashboard Cite

Abstract. Records of chemical impurities from ice cores enable us to reconstruct the past deposition of aerosols onto the polar ice sheets and alpine glaciers. Through that, they allow us to gain insight into changes of the source, transport and deposition processes that ultimately determine the deposition flux at the coreing location. However, the low concentrations of the aerosol species in the ice and the resulting high risk of contamination poses a formidable analytical challenge, especially if long, continuous and highly resolved records are needed. Continuous Flow Analysis, CFA, the continuous melting, decontamination and analysis of ice-core samples has mostly overcome this issue and has quickly become the de-facto standard to obtain high-resolution aerosol records from ice cores after its inception at the University of Bern in the mid 90s. Here we present continuous records of calcium (Ca2+), sodium (Na+), ammonium (NH4+), nitrate (NO3−1) and electrolytic conductivity at 1 mm depth resolution from the NGRIP (North Greenland Ice Core Project) and NEEM (North Greenland Eemian Ice Drilling) ice cores produced by the Bern Continuous Flow Analysis group in the years 2000 to 2011. Both of the records have previously been used in a number of studies but have never been published in the full 1 mm resolution. Alongside the 1 mm datasets we provide decadal averages, a detailed description of the methods, relevant references, an assessment of the quality of the data and its usable resolution. Along the way we will also give some historical context on the development of the Bern CFA system.

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Application of a nested loop system for the flow injection analysis of trace aqueous peroxides

Abstract: The novel concept of a nested loop valve system wherein one Injection valve Is Inserted within the loop of another has some unique benefits. This Is demonstrated for part-per-bllllon level differential flow Injection analysis of aqueous H202 and organic peroxides.

Cited by 63 publications

References 21 publications

Measurement of acid dissociation constants of weak acids by cation exchange and conductometry

Measurement of acid dissociation constants of weak acids by cation exchange and conductometry

High-resolution aerosol concentration data from the Greenland NorthGRIP and NEEM deep ice cores

High resolution aerosol concentration data from the Greenland NorthGRIP and NEEM deep ice cores

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