Mutual separation and preconcentration of vanadium(V) and vanadium(IV) in natural waters with chelating functional group immobilized silica gels followed by determination of vanadium by inductively coupled plasma atomic emission spectrometry

Abstract

Depa rtm en t o f In d us tria I Ch em is tr y, Co lleg e o f Engineering, Nih o n Un ive rsit y, Ko ri yam a , Fu kus h ima 963, JapanThe mutual separation and preconcentration of Vv and VIv using chelating functional group immobilized silica gels (CISs) has been studied, based on inductively coupled plasma atomic emission spectrometric detection. Ethylenediamine-bonded (ED-CIS) and ethylenediaminetriacetate-bonded (ED3A-CIS) silica gels were used. A two-column system consisting of a first column of ED-CIS and a second column of ED3A-CIS was developed for on-line separation and preconcentration of Vv and VIv. In the pH range 2.5-3.0, ED-CIS retains Vv and separates it completely from VIv, whereas ED3A-CIS collects both Vv and VIv. The second column can be used t o preconcentrate VIv in the breakthrough solution from the first column. Separation is achieved with recoveries of 91-105%. The recovery of both ions is 98% or better. An enrichment factor of 40 is obtained, with which the detection limit of V with inductively coupled plasma atomic emission spectrometry is improved down to 60 pg ml-l. The method was applied successfully to V speciation in natural waters.

Determination of V(IV) and V(V) by Electrothermal Atomic Absorption Spectrometry Following Selective Solid-Phase Extraction and the Study on the Change in the Oxidation State of Vanadium Species in Seawater during the Sample Storage

“…2,3 Therefore, the development of the selective determination techniques for V(IV) and V(V) in natural water samples was an attractive topic for many researchers because vanadium is supposed to exist in quadrivalent or pentavalent state. [4][5][6][7][8][9][10][11] The conditions of sample storage are the critical points of the trace analysis. The loss of a desired element resulting from the adsorption on a container wall may occur when the sample solution was stored in the wrong conditions.…”

Flow Injection Analysis for Oxidation State Speciation of Vanadium(IV) and Vanadium(V) in Natural Water

“…10,11 Catalytic spectrophotometry 12-14 is a conventional method used for determination of vanadium with high sensitivity, but generally this kind of method can not distinguish the vanadium species. Recently, a solid phase extraction (SPE) and detection procedures for preconcentration and separation of trace analysis have been developed, using ionexchange resins, 15,16 chelating resins, 17,18 chelating functional group, 19 chelating agents, 20 and activated carbon, 21 coupled with fluorination assisted electrothermal vaporization (FETV)-ICP-OES, 15 FIA-ICP-OES, 16 ICP-AES, 19 electrothermal atomic absorption spectrometry (ETAAS) 22 and graphite furnace AAS. 18,21 However, many of these methods are expensive, timeconsuming, and reagent-consuming; they require skillful operators and must be performed in batchwise.…”

Separation via Flotation, Spectrophotometric Speciation, and Determination of Vanadium(IV) in Wastes of Power Stations

“…Many separation and preconcentration techniques [6][7][8] for the determination of V(V) and V(IV) species have been proposed, including chelation and extraction, precipitation and the use of ion-exchange resins. However, many of these methodologies are performed in batch, thus requiring large sample volumes in order to reach low detection limits.…”