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&EPA United States Environmental Protection Agency Research and Development Test Method Environmental MOnltonng and Support Laboratory Cincinnati OH 45268 Sodium (Atomic Absorption, furnace technique)-Method 273.2 Optimum Concentration Range 1-30 tig/l Detection limit 02 tig/l PreparatIOn of Standard Solution 1 Stock solution Prepare as described under direct aspiratIOn method 2 Prepare dilutions of the stock solutIOn to be used as calibration standards at the time of analysIs These solutions are also to be used for standard additions 3 The calibration standard should be diluted to contain 05% (v/v) HN03 Sample Preservation 1 For sample handling and preser- vation see part 41 of the Atomic Absorption Methods section of this manual Sample Preparation 1 Prepare as described under di- rect aspiration method Sample solutions for analysIs should contain 05% (v/v) HN03 Instrument Parameters (General) 1 Drying Time and Temp 30 sec @ 125°C 2 Ashlng Time and Temp 30 sec @ 250°C 3 Atomizing Time and Temp 10 sec @ 2000°C 4 Purge Gas atmosphere Argon 5 Wavelength 589 6 nm 6 Other operating parameters should be set as specified by the particular Instrument manufacturer AnalysIs Procedure 1 For the analysIs procedure and the calculation, see Furnace Procedure 93 of the Atomic Absorption method section of thiS manual Notes 27321 Dec 1982 1 The above concentration values and Instrument conditions are for a Perkin-Eimer HGA-2100 based on the use of a 20 til injection continUOUS flow purge gas and non-pyrolytlc graphite Smaller size furnace devices or those employing faster rates of atomization can be operated uSing lower atomizatIOn temperatures for shorter time periods than the above recommended settmgs Samples containing concentrations higher than those given In the optimum range should be analyzed by either the direct aspiration method (Method 273 1) or the flame photometric method (Std Methods 14th Edition p 250) Nitrogen may also be used as the purge gas For every sample matrix analyzed, verification IS necessary to determine that method of standard addition IS not required (see 5 2 1 of the Atomic Absorption method section of thiS manual) If method of standard addltlPDF Image | Methods for Chemical Analysis of Water and Wastes
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