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Mercapto-modified magnesium silicate micro-particles for efficient extraction and preconcentration of mercury ions from estuarine waters

Abstract

This article presents a new and robust adsorbent for extraction and preconcentration of Hg ions from estuary samples based on modification of magnesium silicate (MgSi) with 2-mercaptobenzoxazole (MBO). The properties, morphology, and composition of the adsorbent before and after modification were characterized by FT-IR, SEM, and XRD analysis. The concentrated ions were measured by a cold vapor atomic absorption spectrometry (CVAAS). The effects of critical parameters such as the pH value, eluent conditions, and the flow rate and volume of the sample were studied and optimized. The calibration curve was linear within the range of 0.3 to 6.0 ng mL-1 (r = 0.9979). The effect of the major coexisting ions constituting 98% of solutes in natural seawaters was examined using artificial seawater samples. The limit of detection (LOD) of the method was 0.09 ng mL-1 (n=8) under optimum conditions. The relative standard deviations (RSD, n=6) at 0.5 and 4.0 ng mL-1 were 4.3% and 3.9%, respectively. The maximum adsorption capacity of the proposed adsorbent was 58 mg g-1. The developed method was successfully applied to determine ultra-trace amounts of mercury ions in estuary waters with recoveries greater than 97%.

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Publication details

The article was received on 24 Apr 2018, accepted on 11 Jun 2018 and first published on 12 Jun 2018


Article type: Paper
DOI: 10.1039/C8AY00927A
Citation: Anal. Methods, 2018, Accepted Manuscript
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    Mercapto-modified magnesium silicate micro-particles for efficient extraction and preconcentration of mercury ions from estuarine waters

    M. Sajedi-fard, K. Ghanemi and Y. Nikpour, Anal. Methods, 2018, Accepted Manuscript , DOI: 10.1039/C8AY00927A

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