Determination of trace amounts of vanadium by UV–vis spectrophotometric after separation and preconcentration with modified natural clinoptilolite as a new sorbent
Natural clinoptilolite was used as a sorbent material for solid phase extraction and preconcentration of vanadium. The clinoptilolite was first saturated with a cation such as nickel(II) and then modified with benzyldimethyltetradecyleammonium chloride (BDTA) for increasing sorption of 4-(2-pyridyla...
Gespeichert in:
Veröffentlicht in: | Talanta (Oxford) 2008-06, Vol.75 (5), p.1279-1283 |
---|---|
Hauptverfasser: | , |
Format: | Artikel |
Sprache: | eng |
Schlagworte: | |
Online-Zugang: | Volltext |
Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
Zusammenfassung: | Natural clinoptilolite was used as a sorbent material for solid phase extraction and preconcentration of vanadium. The clinoptilolite was first saturated with a cation such as nickel(II) and then modified with benzyldimethyltetradecyleammonium chloride (BDTA) for increasing sorption of 4-(2-pyridylazo)resorcinol (PAR). Vanadium–PAR complex was quantitatively retained on the sorbent by the column method at the pH range 6.2–7.0 at a flow rate of 1
mL
min
−1. It was removed from the column with 5.0
mL of dimethylformamide solution at a flow rate of 0.8
mL
min
−1 and determined by UV–vis spectrophotometry at
λ
max
=
550
nm. 0.031
μg of vanadium can be concentrated from 450
mL of aqueous sample (where detection limit as 0.07
ng
mL
−1 with preconcentration factor of 90). Relative standard deviation for eight replicate determination of 5.0
μg of vanadium in final solution is 2.1%. The interference of number of anions and cations has been studied in detail to optimize the conditions and method was successfully applied for determination of all vanadium as V(IV) form in standard samples. |
---|---|
ISSN: | 0039-9140 1873-3573 |
DOI: | 10.1016/j.talanta.2008.01.045 |