期刊
INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY
卷 96, 期 7, 页码 653-666出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/03067319.2016.1180378
关键词
bismuth; long path spectrophotometry; multi-syringe flow injection analysis (MSFIA); methylthymol blue (MTB); environmental water samples; automation
资金
- Spanish Ministry of Economy and Competitiveness (MINECO) - FEDER funds [CTQ2013-47461-R]
- European Funds [PTQ-2012-05755]
- National Council of Science and Technology in Mexico (CONACYT)
An automated spectrophotometric system is proposed for the determination of bismuth in well water samples, using multi-syringe flow injection analysis (MSFIA) and exploiting a liquid waveguide capillary cell (LWCC). This method is based on the colorimetric reaction of bismuth and methylthymol blue (MTB) in the presence of polyvinylpyrrolidone (PVP) in acid medium (0.1molL(-1) HNO3). The Bi(III)-MTB complex was measured at 600nm. The method was optimised by multivariate techniques. Some figures of merit of the proposed system are worth being highlighted, such as its wide linear working range (between 4.9 and 600gL(-1)), its low detection limit (1.5gL(-1) of bismuth) and its high intra-day precision and inter-day precision (0.7% (n=12) and 1.4% (n=5), respectively, both expressed as RSD). Moreover, a high injection frequency of 30h(-1) is achieved, as the proposed analyser is a powerful tool for fast Bi(III) determination. The method developed was successfully validated by analysing reference samples (pharmaceutical samples) by comparing the results with those obtained by ICP-OES and it was satisfactorily applied to well water samples. Besides, the present system is miniaturised allowing in situ measurements in control processes and field analysis.
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