Development of a Novel DGT Passive Sampler for Measuring Cs-137 In Situ in Marine Environments
Ahmed Elsenbawy, Jacqueline M. Pates, Nariman H. M. Kamel, Tarek Morsi, Mohammed Mekewi, Ayman El-gamal, Nabawia A. Moussa, Hao Zhang
TL;DR
A new DGT passive sampler using potassium zinc hexacyanoferrate was developed to accurately measure Cs-137 in seawater over long periods.
Contribution
A novel DGT sampler with a KZFCN binding layer that overcomes ion competition and high pH challenges in seawater.
Findings
The KZFCN-DGT sampler works effectively in a pH range of 2–12 and ionic strength up to 0.75 M.
The sampler showed good precision (RSD = 13%) and accuracy (relative error = 8.5%) over 4 weeks.
The Cs+ diffusion coefficient in the gel was consistent with literature values.
Abstract
Cs-137 is the most released fission product in the marine environment. It is important to develop a robust in situ technique for its monitoring. The existing diffusive gradients in thin films (DGT) passive sampling techniques for in situ measurement of Cs+ have some limitations due to the ion competition and high pH of seawater. A new DGT sampler based on potassium zinc hexacyanoferrate (KZFCN) as a binding layer has been developed and investigated for the measurement of the time-weighted average concentration of Cs-137 in seawater. This binding layer proved a working pH range of 2–12 and an ionic strength of up to 0.75 M. Two types of diffusive gels were tested and agarose gel (AGE) was chosen for the KZFCN-DGT sampler. The measured Cs+ diffusion coefficient (1.71 × 10–5 cm2·s–1 at 25 °C) in the diffusive gel from seawater was within the expected range published in the literature. The…
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Taxonomy
TopicsRadioactive contamination and transfer · Radiation Detection and Scintillator Technologies · Nuclear Physics and Applications