Environmental Laboratory 77


loads and rinses the IC sample loop. The sample loop may be used to fi ll the pre-concentrator when present in the IC.


Calibration


Calibration standards are made from 4-Fluorbenzoic acid, 4-Chlorobenzoic acid, and 4- Bromobenzoic acid in DI water. All individual standards go through the complete process for each analysis: fi ltration (adsorption onto activated carbon), introduction, combustion, fraction collection, IC injection, and detection. Each calibration standard is analyzed three times.


Summary


The XPREP C-IC has been used to perform automated sample preparation of Combustion-IC analysis. The XPREP C-IC covers pyrohydrolitic sample combustion, fraction collection, and injection towards the IC. Water samples were pre-treated by the XPREP-3 fi ltration system to adsorb the organically bound halogens onto the activated carbon. Sample cups containing the activated carbon were introduced by the NEWTON solids autosampler into the boat-inlet system of the XPREP C-IC Combustion Unit. The activated carbon is combusted in an oxygen-rich environment at a high temperature. After combustion, the output gas stream containing the analytes is transferred to the Fraction Collection Unit and trapped in the absorber medium. Each individual analysis consists of sample fi ltration (adsorption onto activated carbon), combustion, fraction collection, IC injection, and detection. The IC provides accurate results with excellent repeatability (RSD) at trace level and good recoveries of targeted ions (F- samples.


, Cl- , Br- ) in spiked


Are you interested in the analytical solutions TE Instruments has to offer?? Please feel free to contact us for more information, or challenge us with your application request.


Email: Sales@teinstruments.com or call: +31 15 8795559 Example Chromatograms Figure 1 – Calibration line Bromide 0 – 100 µg/L - r2 0.9999 The IC has been calibrated in the following ranges for the individual components:


Organic Component Fluoride Chloride Bromide


Table 3 - Calibration Range of Individual Halides Range


0 – 100 µg/L 0 – 100 µg/L 0 – 100 µg/L


Regression – r2 0.9998 0.9998 0.9999


Figure 2 – Tab Water


Figure 3 – Tab Water Spiked with 10 µg/L


Author Contact Details Nick Wiegman, TE Instruments • Voltaweg 22, 2627 BC Delft, The Netherlands • Tel: +31 (0) 15 879 55 59 • Email: sales@teinstruments.com • Web: www.teinstruments.com


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