Extraction and Analysis of Strontium in Water Sample Using a Sr (2+) Selective Polymer as the Absorbent Phase.

Rongjian Ying

doi:10.1155/2015/425084

Abstract

A kind of Sr2+ selective resin was applied as an absorption phase to extract Sr2+ ion from an aqueous solution, and the amount of Sr2+ was determined using inductively coupled plasma optical emission spectrometer. Factors, including absorption time, temperature, stirring rate, salt-out effect, desorption, and the pH of the aqueous solution, were investigated to optimize the absorption efficiency of Sr2+. Foreign ions were examined to observe their effects on the absorption behavior of Sr2+. The optimum condition was absorption time at 20 min, pH of aqueous solution 7, temperature of 35°C, and 600 rpm stirring rate. A 10 mL solution of 0.1 mol/L HCl is used as the desorption agent. The linear range of Sr2+ concentrations from 50 to 1200 μg/L was investigated with the slope of 183 μg/L. The limit of detection was 21 μg/L with 4.23% relative standard deviation. The correlation coefficient was found to be 0.9947. Under the optimized conditions, the concentrations of Sr2+ in four water samples were detected by the developed method. We propose that this method effectively extracts strontium ion from environmental water samples.

Highlights

Strontium and its isotopes as effective tracers are applied for characterizing geochemical and biogeochemical behaviors in the fields of archaeology [1, 2], water-rock interactions [3], and geologic chronology [4] to identify and trace the origins and evolutions of the climate and the environment [5, 6]
The separation of strontium from alkali and alkaline-earth elements is important for the determination of strontium isotopic composition in natural sample and for the isotopic detection of 87Sr and 87Rb by thermal ionization mass spectrometry (TIMS) or multicollector inductively coupled plasma mass spectrometry
Natural strontium compounds coexist with other alkali and alkaline-earth compounds, such as sodium, calcium, magnesium, and barium compounds, which make the separation of strontium more complex

Summary

Introduction

Strontium and its isotopes as effective tracers are applied for characterizing geochemical and biogeochemical behaviors in the fields of archaeology [1, 2], water-rock interactions [3], and geologic chronology [4] to identify and trace the origins and evolutions of the climate and the environment [5, 6]. The methods include the use of ion-exchange resins [12, 13], dispersive liquid phase microextraction [14, 15], and strontium specific resins [16]. By these methods, strontium ion was separated along with other alkaline-earth elements that demonstrate similar chemical behaviors [7]. Strontium ion was separated along with other alkaline-earth elements that demonstrate similar chemical behaviors [7] Alkali elements, such as sodium, potassium, rubidium, and others, interfered with the strontium separation

Objectives

Methods

Results