Spectrophotometric sensor system based on a liquid waveguide capillary cell for the determination of titanium: Application to natural waters, sunscreens and a lake sediment

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• 作者：Ricardo N.M.J. Pá ; scoa^a ; Ildik&#xf3 ; V. T&#xf3 ; th^b ; Agostinho A. Almeida^b ; Ant&#xf3 ; nio O.S.S. Rangel^a ; ^{aorangel@esb.ucp.pt"" rel=""nofollow} [Author vitae]
• 关键词：Titanium ; Multi-pumping flow system ; Liquid waveguide capillary cell ; Spectrophotometry ; Trace analysis
• 刊名：Sensors and Actuators B: Chemical
• 出版年：2011
• 出版时间：20 September 2011
• 年：2011
• 卷：157
• 期：1
• 页码：51-56
• 全文大小：259 K

文摘

An analytical procedure for the spectrophotometric determination of titanium at trace levels was developed. The procedure involves the use of a multi-pumping flow system (MPFS) coupled with a liquid waveguide capillary cell (LWCC) with 1.0 m path length, 550 μm i.d. and 250 μL internal volume, which enabled to enhance the sensitivity of the determination and thus avoid complex and time-consuming pre-concentration steps. The determination is based on the colorimetric reaction of titanium with chromotropic acid. The limit of detection (3σ) was 0.4 μg/L and a linear response up to 100 μg/L with a sample throughput of 46 h⁻¹, and a low reagent consumption/effluent production was achieved. The developed procedure was applied to natural waters, sunscreen formulations and one certified lake sediment sample.