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- W2000524674 abstract "Total reflection X-ray fluorescence spectrometry (TXRF) offers the possibility of simple and precise multielement determination of trace element impurities in ultrapure regents. With little expenditure of time and sample preparation—30 min for sample preparation and measurement are usual—as well as the small sample volumes involved, 100 μl of sample material are sufficient for a complete multielement determination, detection limits in the range of 20–100 pgml have been obtained. Adapting a simple evaporation step for pre-concentration, the limits of detection can be improved to below 5 pgml. The precision is in the range of 5–20%. The reliability of the sample preparation procedures and the accuracy of the results are checked by recovery investigations and by independent analysis of duplicate samples using ICP-MS. Results obtained for commercial products, such as HF, HCl, HNO3, H2SO4, NH4F and NH3, are presented and are compared to those obtained after additional purification." @default.
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- W2000524674 date "1991-01-01" @default.
- W2000524674 modified "2023-10-10" @default.
- W2000524674 title "Determination of trace element impurities in ultrapure reagents by total reflection X-ray spectrometry" @default.
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- W2000524674 doi "https://doi.org/10.1016/0584-8547(91)80188-9" @default.
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