The distribution coefficient (Kd) of Rf on ion exchange resins at various HNO3/HF concentrations had been studied [1]. Rf was eluted at higher HF concentrations from CIX than Zr and Hf and rather resembled Th. Up to 1 M HF, Rf was not retained on the AIX also resembling its pseudo-homolog Th. Th is known to form no anionic fluoride complexes, while Zr and Hf are forming complexes of the type [M...

Adsorption processes often include three important components: kinetics, isotherm, and thermodynamics. In the study of solid–liquid adsorption, “standard” thermodynamic equilibrium constant K Eq o ; dimensionless) pla...

2. The dissolved-phase fraction (fdissolved) is a function of the characteristics and level of suspended solids and dissolved organic matter, which may be estimated from the following relationship, where [SS] is suspended solid content, [DOC] is DOC concentration, kd is partition coefficient between the dissolved phase and the suspended solids, and kDOC is the partition coefficient between the ...

a = nongray stretching factor for fill-spectrum k-distribution method I = radiative intensity,W∕m sr Ib = blackbody intensity/Planck function, W∕m sr k = reordered absorption coefficients in k distribution, cm−1 L = length of one-dimensional medium, cm M = total number of groups of nth gas component N = total number of species/scales P = total pressure, bar PL = pressure path length, P × L, bar...

This review synthesizes the methods for estimating distribution coefficient (Kd) and provides a compilation of Kd values five heavy metals (As, Pb, Cd, Cu, Zn) based on research published in last decade (2012-2021). We used PRISMA method to ensure transparency collected data. For mono-metal systems (MS), ranged from 10-2 107 L/kg 106 As, Zn, 105 Cu. In competitive (CS), 104 while no value As wa...

One concern about using transgenic plants is the genetic variation that occurred from theirs tissue culture and regeneration. Molecular markers are an important element for efficient and effective determination of genetic variation. The present work was carried out to assess the genetic uniformity of transgenic cottons (Bt and chitinase lines), using RAPD, ISSR molecular markers and SDS-PAGE an...

In this study, the distribution coefficient of Nickel on Anarak nuclear repository was studied considering effects contaminant concentration, soil particle size, and soil/solution ratio. For purpose, two experiments were designed. The sample collected from inside trench Nuclear Repository by channel method its characteristics determined using ASTM method. batch employed while different concentr...

The complexation of arsenic (As) with dissolved organic matter (DOM), although playing an important role in regulating As mobility and transformation, is poorly characterized, as evidenced by scarce reporting of fundamental parameters of As-DOM complexes. The complexation of arsenite (AsIII) with Aldrich humic acid (HA) at different pHs was characterized using a recently developed analytical te...

Propionic acid is a carboxylic acid produced by fermentation and widely used in chemical, pharmaceutical and food industries. It is used primarily for animal feed preservation, including hay, silage, and grains, and in human foods (mainly in baked goods and cheeses). The growing demand of this acid draws attention towards a more economical energy efficient technology. The conventional methods f...