Solid‐phase extraction and pre‐concentration of trace metals in natural waters using indigenously synthesized chelating resin and their subsequent determination by ICP‐OES

Abstract

A laboratory made chelating resin based on immobilization of fluorinated β-diketone group on styrene divinyl benzene was employed for the extraction and pre-concentration of trace metals in natural water samples before their determination by inductively coupled plasma optical emission spectrometry (ICP-OES). Extraction efficiency of the resin toward metal ions was examined by column procedure. Various experimental parameters consisting pH, sample loading flow rate, eluent concentration/volume and breakthrough limits were investigated for the effective uptake of metals on the resin. The resin capacity at pH (9) was found to be 10. 20, 9.13, 7.47, 8.67, 3.12, 6.45 and 9.80 mg g −1 for Cd (Cadmium), Co (Cobalt), Fe (Iron), Mn (Manganese), Mo (Molybdenum), Ni (Nickel) and Zn (Zinc), respectively. The method was applied for the extraction/pre-concentration of Cd, Co, Fe, Mn, Mo, Ni and Zn in natural water samples and their subsequent determination was carried out by ICP-OES. Percentage recoveries obtained for the selected metals except Mo were ≥95% under similar experimental conditions with <5% relative standard deviation. Alkali/alkaline earth metals, the major matrix ions were not retained on the resin, the resin is selective for trace metals, therefore it is suitable for the extraction of these metals in natural water samples for environmental and health-related studies. 

Study on the synthesis of a macroporous ethylacrylate‐divinylbenzene copolymer, its conversion into a bi‐functional cation exchange resin and applications for extraction of toxic heavy metals from wastewater

“…It was evaluated for extraction of heavy metals from water samples. The capacities of the resin for some common toxic metals found in wastewater were comparable or better than other sorbents reported in literature28–33 as shown in Table V.…”

Silica sequentially modified with polyhexamethylene guanidine and Arsenazo I for preconcentration and ICP–OES determination of metals in natural waters

“…Sorption preconcentration [1][2][3][4][5][6][7] allows reduction of the detection limits of elements and elimination of the influence of matrix components of natural waters for their subsequent determination by multielement method such as inductively coupled plasma mass spectrometry [1][2][3] and inductively coupled plasma optical emission spectrometry (ICP-OES) [4][5][6].…”

“…Various sorbents have been proposed for sorption preconcentration of metal ions: synthetic polymers based [2][3][4]8], activated carbon based [5] and inorganic oxide based [7,[9][10][11]. Special attention should be paid to the silica-based sorbents because the matrices of these sorbents are widely used and available.…”