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Fully Automating Environmental Analyses Using Inline Autodilution
Poster Presentation
Prepared by P. Field, A. Schultz
Elemental Scientific, 1500 N 24th Street, Omaha, NE, 68110
Contact Information: field@icpms.com; 402-210-8608
ABSTRACT
The prepFAST is a completely integrated inline autodilution system for ICP-OES and ICP-MS instruments. Three of the most powerful, fully-automated functions of prepFAST include: 1) inline dilution of a single multi-element stock standard to generate calibration curves, 2) user defined inline dilution of samples, and 3) inline dilution Quality Control Over Range samples to eliminate QC failures. In environmental samples organic ligand concentration, complexation, pH and ionic strength, are major factors that control the partitioning of metals between the dissolved (< 0.45 mm) and particulate (>0.45 mm) phases in natural waters. As a result, most environmentally important metals have high affinity for particles and therefore exhibit low dissolved and high total metal concentrations. To cover the full range of natural variability, autocalibration curves generated from single multi-element stock standard solution with calibration coefficients greater than 0.9999. Accuracy of dissolved metal concentrations determined for NIST 1643e are in excellent agreement with certified values. Omaha tap water is used as the EPA 200.8 defined, Laboratory Fortified Matrix (LFM) and Quality Control Standard (QCS). The fully automated method for environmental samples illustrates, recovery of 95-105% and precision of less than +/- 3% greatly exceeding EPA requirements of 70-130% and +/- 10%, respectively.
Poster Presentation
Prepared by P. Field, A. Schultz
Elemental Scientific, 1500 N 24th Street, Omaha, NE, 68110
Contact Information: field@icpms.com; 402-210-8608
ABSTRACT
The prepFAST is a completely integrated inline autodilution system for ICP-OES and ICP-MS instruments. Three of the most powerful, fully-automated functions of prepFAST include: 1) inline dilution of a single multi-element stock standard to generate calibration curves, 2) user defined inline dilution of samples, and 3) inline dilution Quality Control Over Range samples to eliminate QC failures. In environmental samples organic ligand concentration, complexation, pH and ionic strength, are major factors that control the partitioning of metals between the dissolved (< 0.45 mm) and particulate (>0.45 mm) phases in natural waters. As a result, most environmentally important metals have high affinity for particles and therefore exhibit low dissolved and high total metal concentrations. To cover the full range of natural variability, autocalibration curves generated from single multi-element stock standard solution with calibration coefficients greater than 0.9999. Accuracy of dissolved metal concentrations determined for NIST 1643e are in excellent agreement with certified values. Omaha tap water is used as the EPA 200.8 defined, Laboratory Fortified Matrix (LFM) and Quality Control Standard (QCS). The fully automated method for environmental samples illustrates, recovery of 95-105% and precision of less than +/- 3% greatly exceeding EPA requirements of 70-130% and +/- 10%, respectively.