C18-coated stir bar sorptive extraction combined with HPLC-ICP-MS for the speciation of butyltins in environmental samples. Issue 1 (7th November 2014)

• Record Type: Journal Article
• Authors: Mao, Xiangju; Fan, Wenying; He, Man; Chen, Beibei; Hu, Bin
• Is Part Of: Journal of analytical atomic spectrometry. Volume 30:Issue 1(2015:Jan.)
• Page Start: 162
• Page End: 171
• Publication Date: 2014-11-07
• Subjects: Atomic spectra -- Periodicals; Atomic absorption spectroscopy -- Periodicals; 543.0858
• DOI: 10.1039/c4ja00294f
• Languages: English
• ISSNs: 0267-9477

Abstract

Abstract : A simple, rapid and sensitive method of C18 -SBSE-HPLC-ICP-MS for the speciation of butyltins in environmental waters and sediments. Abstract : In this paper, a new approach of C18 -coated stir bar sorptive extraction (SBSE) coupled with high performance liquid chromatography-inductively coupled plasma mass spectrometry (HPLC-ICP-MS) was developed for the speciation of butyltins in environmental samples. The butyltin compounds, including monobutyltin trichloride (MBT), dibutyltin dichloride (DBT) and tributyltin chloride (TBT), were first extracted with a C18 -coated stir bar, and then desorbed with 40% (v/v) methanol for subsequent HPLC-ICP-MS analysis. The factors affecting C18 -SBSE were systematically studied. To reduce the percentage of organic solvents in the mobile phase loaded on the plasma and to improve the separation resolution, a CN column with carboxylic acids as the mobile phase additives was used for butyltin separation. Quick separation (<8 min) was accomplished using a methanol–formic acid–water (16 : 8 : 76, v/v/v) mobile phase containing 5 mmol L −1 mercaptoacetic acid, and the mobile phase was compatible with the conventional quadrupole ICP-MS detector without addition of oxygen gas or desolvation and post-column dilution systems. Under the optimal conditions, the limits of detection for three target butyltins ranged from 15.6 to 29.4 ng L −1, with a linear range of 0.05–50 μg L −1 . The enrichment factors (EFs) were 85- to 127-fold (the theoretical EF is 200-fold). The developed method is simple and rapid, with no derivatization involved, and is successfully applied to the speciation of butyltins in the Certified Reference Material of PACS-2 sediment and real water as well as sediment samples from the East Lake, Yangtze River and Bohai Sea in China.