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

SENSORS AND ACTUATORS B-CHEMICAL

卷:157

Article

Pascoa, Ricardo N. M. J.¹  Toth, Ildiko V.²  Almeida, Agostinho A.²  Rangel, Antonio O. S. S.¹ 

[1] Univ Catolica Portuguesa, CBQF Escola Super Biotecnol, P-4200072 Porto, Portugal

[2] Univ Porto, Fac Farm, Dept Quim, REQUIMTE, P-4050047 Porto, Portugal

关键词: Titanium;    Multi-pumping flow system;    Liquid waveguide capillary cell;    Spectrophotometry;    Trace analysis;   

DOI  :  10.1016/j.snb.2011.03.025

来源: Elsevier

【 摘 要 】

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 mu m i.d. and 250 mu L 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 calorimetric reaction of titanium with chromotropic acid. The limit of detection (3 sigma) was 0.4 mu g/L and a linear response up to 100 mu.g/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. (C)2011 Elsevier B.V. All rights reserved.

【 授权许可】

Free