The importance of physico-chemical parameters on the speciation of natural radionuclides in riverine ecosystems

Environmental evolution records reflected by radionuclides in the sediment of coastal wetlands: A case study in the Yellow River Estuary wetland

“…Radionuclides may be retained by the sediments through fixation or be removed through desorption (ElReefy et al, 2014). Their mobility mainly depends on nuclide species and was also affected by physical and chemical properties such as organic matter content, redox conditions, pH, granulometric contents and mineral compositions (Aytas et al, 2012;Gavrilescu et al, 2009;Narayana and Rajashekara, 2010;Tsunashima et al, 1981). U exists in sediments in cationic form, mainly the uranous U(IV) and uranyl U(VI).…”

Seasonal variation and behavior of 210Pb in the soil and sediment of Hemavathi riverine environment

“…Other physico-chemical parameters were measured by using standard protocol. 7,8 In the present investigation the sand, silt and clay fractions were separated to find the type of soil and sediment. About 20g of sediment or soil sample was taken in a beaker; added 30% of H 2 O 2 to remove organic matter and 10% acetic acid to remove carbonate material present in the samples.…”

Radioecological, physicochemical, and mineralogical investigations of soil samples from neutral and vegetation land in Ropar, Punjab (India)

“…Often, it has been observed that a finer fraction of grain size of soil and sediments results in higher activity concentrations of 238 U, 232 Th, and 40 K (Narayana and Rajashekara, 2010). The increment in activity concentration of naturally occurring radionuclides in vegetation land is mainly due to the adsorption of radionuclides onto crystals, their grain boundaries, or the crystal defects (Baeza et al, 1995).…”