Field study on thorium uptake by plants within and around of a thorium ore deposit

Impact of Tropical Ecosystem on the Migrational Behavior of K-40, Cs-137, Th-232 U-238 in Perennial Plants

“…Under acidic conditions of soil, UO 2þ 2 is the predominant uranium species in the soil whereas Th has only one stable oxidation state i.e. IV, under all redox conditions in soil and is extremely particle reactive having K d value of the order of 10 6 (Saric et al 1995;Zararsiz et al 1997). Hence, higher soil to plant concentration was observed in case of uranium compared to thorium.…”

“…Determination of soil to plant transfer factor (TF S-P ) in case of perennial plant is an important tool for understanding the impact of local geo-chemical environment on the uptake of radionuclides from soil. Radioactivity in the soil due to anthropogenic radionuclides is indicative of the distribution and accumulation of radioactivity in the environment due to nuclear facilities whereas the natural radionuclides in the soil are a true representation of rock material beneath the surface soil (Saric et al 1995;Zararsiz et al 1997). The specific levels of terrestrial environmental radiation is related to the geological composition of each lithologically separated area and to the content of thorium (Th), uranium (U) and potassium (K) of the rock from which the soil originate in each area.…”

Thorium uptake by wheat at different stages of plant growth

“…The studies on the fate and transport of thorium in the environment are more limited. However, recently the biogeochemistry of thorium has generated more interest to the environmental scientists (Higgy and Pimpl, 1998;Zararsiz et al, 1997;Morton et al, 2001;Sar and D'Souza, 2002;Morton et al, 2002).…”

Subcellular distribution and chemical forms of thorium in Brassica juncea var. foliosa

“…Exposure of human to Th will increase the risk of pancreatic cancer, colorectal cancer and some other serious diseases due to its radiotoxicity and chemical toxicity (ATSDR, 1999), thus the remediation of Th-contaminated soil is extremely urgent. Among various strategies, phytoremediation has a great potential for the remediation of radioactively contaminated soil with significant advantages such as low cost, environmental friendly and in-situ remediation (Salt et al, 1998;Willscher et al, 2013;Zararsiz et al, 1997). However, studies on phytoremediation of Th-contaminated soil are still far from being comprehensive, for instance, recent studies have mainly focused on the search of hyperaccumulators (Li et al, 2011;Saritz, 2005;Oufni et al, 2011) and influential factors on the accumulation of Th in plants (Shtangeeva et al, 2005;Soudek et al, 2013;Wang et al, 2014).…”