Assimilation and transport of organic bound tritium in an irrigated pine forest

Duff, Martine C.; Kuhne, Wendy  W.; Viner, Brian; Swindle, Ashlee; Houk, Amanda L.; Chiswell, Steven; Hunter, Douglas B.; Rivera, Omar E.

doi:10.1039/C9EM00165D

Title: Assimilation and transport of organic bound tritium in an irrigated pine forest

Journal Article · Mon Jun 10 00:00:00 EDT 2019 · Environmental Science: Processes & Impacts

DOI:https://doi.org/10.1039/C9EM00165D· OSTI ID:1591774

^[1];

^[1]; Viner, Brian ^[1]; Swindle, Ashlee ^[1];

^[1]; Chiswell, Steven ^[1]; Hunter, Douglas B. ^[1]; Rivera, Omar E. ^[1]

Savannah River Site (SRS), Aiken, SC (United States)

The speciation of radioactive tritium (T) in a naturally-established subtropical loblolly pine forest that has been irrigated with highly-contaminated pond water for the last 20 years is reported. This irrigation project was created to limit the underground transport of a tritium-rich plume which also contains low levels of toxic organics, metals and radionuclides such as carbon-14 (¹⁴C) from a nearby low-level waste burial ground. The levels of tritiated water (HTO) in the wood cores were not influenced by recent irrigation activities. However, the tritium levels in the last 20 years of tree growth were more than 3-fold higher than that of tritium in the older growth. This was due to recent irrigation with organic-bound tritium (OBT)-rich water and subsequent accumulation of high levels tritium as OBT relative to tissue HTO. High levels of pond irrigation water OBT resulted from biogenic processes that converted HTO to OBT. Data for ¹⁴C that were acquired for some of the forest materials indicated that the processes controlling the movement and accumulation of ¹⁴C in this system are somewhat different than that of tritium. Spectroscopic characterization of tree core tissue of <20 years in age found no explanation for the unusually wide dark growth rings. Here, it was concluded that the trees were over-irrigated based on results from other published studies with wood from severely-flooded areas. Although HTO is indeed toxic to biota, OBT represents a relatively greater hazard to biota because it can be bioaccumulated and retained for long periods of time in living tissues.

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Research Organization:: Savannah River Site (SRS), Aiken, SC (United States); Savannah River National Laboratory (SRNL), Aiken, SC (United States)

Sponsoring Organization:: USDOE Office of Environmental Management (EM); USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation

Grant/Contract Number:: AC09-08SR22470; FG52-05NA27035

OSTI ID:: 1591774

Alternate ID(s):: OSTI ID: 1525492

Report Number(s):: SRNL-STI-2019-00314; ESPICZ; TRN: US2102092

Journal Information:: Environmental Science: Processes & Impacts, Vol. 21, Issue 6; ISSN 2050-7887

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 6 works

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