Abstract
Sorptive properties of Transcarpathian clinoptilolite towards trace amounts of Lu(III) were studied under dynamic conditions. It is shown that this lanthanide is sorbed from the weakly alkaline solution (?? 10) most efficiently. The sorption capacity of clinoptilolite under the optimal conditions is equal to 9.37 mg g-1. The distribution of various species of Lu(III) in aqueous solutions at various total concentration of the lanthanide in the pH range from 4 to 13 was calculated. The best desorbent of Lu(III) is the 1 mol L-1 solution of NaCl, preacidified with the solution of HCl to a value of ?? 4.0. This desorbent enables 95-100 % of Lu(III) removal. The method of Lu(III) trace amounts preconcentration from aqueous samples in a solid phase extraction mode with the further determination of this rare earth element via the spectrophotometric method using arsenazo III was developed. The linearity of the proposed method was observed in the range of 1-12 ng mL-1 with the detection limit of 0.4 ng mL-1.
Highlights
Nowadays lanthanides (Ln) are widely used in many innovative industrial processes: for the preparation of constant magnets, catalysts, powerful lasers, magnetic alloys, and in machine engineering, radioelectronics, chemical industry, nuclear power, cosmetology, and medicine.[1,2,3,4,5,6] That is why the wastes of these metals cause a danger of natural waters contamination, which can lead to a potential risk for the whole environment.Unlike many other heavy metals, Ln are not considered the priority environmental contaminants
The energy distribution function of water thermodesorption from the Transcarpathian clinoptilolite surface is described by an asymmetric curve with the maximum near 35 kJ mol–1.34 The difference between the numeric values of sorption characteristics of specific clinoptilolite samples taken from the same batch of sorbent was between 2–3%
The dissociation of surface hydroxo-groups of the sorbent that first of all are responsible for heavy metals sorption from solutions, is almost completely inhibited at low pH values, which is the reason for the small value of clinoptilolite sorption capacity towards Lu(III)
Summary
Unlike many other heavy metals, Ln are not considered the priority environmental contaminants. It is known that they cause negative consequences for the human health.[7] That is why the determination of Ln in natural waters is important from the point of view of analytical chemistry, and geochemistry, oceanography, and natural science.[8,9,10,11,12]. Ln are present in natural objects in small quantities, so often the preliminary treatment of samples is applied for their determination, which in particular includes preconcentration, separation, and exclusion.[13,14,15,16]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
