Automated total and radioactive strontium separation and preconcentration in samples of environmental interest exploiting a lab-on-valve system

作者：Rodriguez Rogelio; Avivar Jessica; Ferrer Laura; Leal Luz O^*; Cerda Victor

来源：Talanta, 2012, 96: 96-101.

DOI：10.1016/j.talanta.2011.11.042

• Strontium
• LOV
• Environmental samples
• Solid phase extraction
• ICP-OES
• Low background proportional counter

A novel lab-on-valve system has been developed for strontium determination in environmental samples. Miniaturized lab-on-valve system potentially offers facilities to allow any kind of chemical and physical processes, including fluidic and microcarrier bead control, homogenous reaction and liquid-solid interaction. A rapid, inexpensive and fully automated method for the separation and preconcentration of total and radioactive strontium, using a solid phase extraction material (Sr-Resin), has been developed. Total strontium concentrations are determined by ICP-OES and Sr-90 activities by a low background proportional counter. The method has been successfully applied to different water samples of environmental interest. The proposed system offers minimization of sample handling, drastic reduction of reagent volume, improvement of the reproducibility and sample throughput and attains a significant decrease of both time and cost per analysis. The LLD of the total Sr reached is 1.8 ng and the minimum detectable activity for Sr-90 is 0.008 Bq. The repeatability of the separation procedure is 1.2% (n = 10).

• 出版日期2012-7-15