Comparison of two methods to determine 129I in charcoal cartridge samples by AMS

Francisco, Barbara Bruna A.; Bergl, R.; Zhao, Xiaolei; Cornett, R. J.; Kieser, W.E.

doi:10.1016/j.nimb.2019.12.015

Cited by 6 publications

(5 citation statements)

References 8 publications

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“…For separation of the adsorbed iodine from activated carbon for determination of GOI, even though alkaline solution extraction is applicable, it is likely that incomplete extraction may underestimate the concentration and fraction of GOI. 41 Therefore, the thorough combustion of activated carbon medium is preferred to release iodine for further chemical preparation of 129 I. The thermogravimetric analysis of five brands of activated carbon during combustion at different temperatures in a muffle oven (Figure S3) showed that 5−13% weight was lost below 130 °C and up to 99.7% mass loss occurred between 450 and 920 °C within 20 min.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Ultra-Sensitive Determination of Particulate, Gaseous Inorganic and Organic Iodine-129 and Iodine-127 in Ambient Air

et al. 2022

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Atmospheric iodine cycling is of significance in climate change and environmental and health impacts. To better explore speciation transformation of atmospheric stable and radioactive iodine, an ultra-sensitive analytical method was established for determination of 129I and 127I in particulate, gaseous inorganic, and gaseous organic species, which was conducted with a self-designed cascade sampling apparatus, followed by their separation with a pyrolysis system and accelerator mass spectrometry and ICP–MS measurements. Combustion protocols for three sampling matrices and NaOH concentration for iodine trapping were optimized to achieve a safe analytical procedure with a high chemical yield of iodine. Based on the lowest concentrations of 129I and 127I, a suitable activated carbon product for adsorption of gaseous organic iodine was carefully selected. The detection limits of the three species were 0.30–2.21 ng m–3 for 127I and 0.05–0.22 × 105 atoms m–3 for 129I. This newly established method was successfully applied to analyze the levels and species of 129I and 127I in ambinet air from Xi’an, China, from May to August, 2020. Gaseous organic iodine was found to be the dominant species of 127I and 129I, accounting for about half of total iodine, and gaseous inorganic iodine and particulate iodine accounted for one-quarter each during the whole sampling period. Speciation variation of 129I and 127I indicates that speciation transformation apparently occurred at the turn of spring and summer, mainly between particulate and gaseous organic iodine. This study has implications on delicate tracing of the atmospheric behavior of iodine with long-lived anthropogenic 129I.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Ultra-Sensitive Determination of Particulate, Gaseous Inorganic and Organic Iodine-129 and Iodine-127 in Ambient Air

et al. 2022

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“…To overcome these challenges, an extraction method of 129 I from charcoal cartridges was developed. 49 The charcoal cartridges had previously been used to collect gaseous emissions from the Canadian Nuclear Laboratories. An extraction system was derived, which consisted of a 50 mL Erlenmeyer ask (reactor) connected via a low-density polyethylene tube to a 20 mL glass vial (collector).…”

Section: Organic Chemicalsmentioning

confidence: 99%

Atomic spectrometry update: review of advances in the analysis of metals, chemicals and materials

Carter

Clough

Fisher

et al. 2020

J. Anal. At. Spectrom.

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“…A 3MV HVE tandem AMS system was used to measure the concentrations of 129 I in the AgI extracted from the urine at the Andre E. Lalonde Accelerator Mass Spectrometry Laboratory. The technical details of the 129 I measurement by AMS are described in (Francisco et al 2020) and ion source parameters are given in Table 2. An Agilent 8800 ICP-MS triple quadrupole was used to measure the concentrations of 127 I.…”

Section: Chemicals and Instrumentsmentioning

confidence: 99%

A Rapid and Efficient Autoclave Pre-Treatment to Extract Iodine-129 from Urine Samples for AMS Analysis

Alotaibi

Mn²,

Rj³

2020

Preprint

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A new method was developed to extract 129I from urine samples and then measure it by AMS. The samples were pre-treated in an autoclave with hydrogen peroxide to remove unwanted compounds from the urine samples and were acidified with nitric acid, followed by precipitation of iodine as silver iodide (AgI) for measurement by AMS. This new procedure is substantially faster than previous methods for the extraction of iodine from urine and results in less chemical waste. The efficiency and reproducibility of this method were evaluated by using 125I as a yield tracer, eventually giving a recovery above 99%. To achieve this, several iterations of the method were required. The method was then successfully applied to measure 129I/127I isotopic ratios and 129I concentrations in 25 human urine samples. The AMS results for 129I in urine ranged 3.3 x 106 atoms/L to 884 x 106 atoms/L and the isotope ratio (129I/127I) in human urine ranged from 7.38 x 10-12 to 3.97 x 10-10 with a median of 1.29 x 10-10. This new method will be useful for investigations into the sources of iodine in the human diet and their relative importance for iodine sufficiency.

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Comparison of two methods to determine 129I in charcoal cartridge samples by AMS

Cited by 6 publications

References 8 publications

Ultra-Sensitive Determination of Particulate, Gaseous Inorganic and Organic Iodine-129 and Iodine-127 in Ambient Air

Ultra-Sensitive Determination of Particulate, Gaseous Inorganic and Organic Iodine-129 and Iodine-127 in Ambient Air

Atomic spectrometry update: review of advances in the analysis of metals, chemicals and materials

A Rapid and Efficient Autoclave Pre-Treatment to Extract Iodine-129 from Urine Samples for AMS Analysis

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