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.~ <br />0 0 <br />Si~,v~~a <br />Method 272.2 (Atomic Absorption, furnace technique) <br />S'd'®I2E'I' I~1®. 'Il'otal Ofl077 <br />IIDissolaed Ofl075 <br />Suspended 01076 <br />~,.~ <br />~~~ <br />Optimum Concentration Rangc: 1-25 ug/1 <br />Aetection I.iruit: 0.2 ug/I <br />Preparation of Standard Solution <br />1. Stock Solution: Prepare az described under "direct aspiration method". <br />2. Prepare dilutions oC the stock solution to be used as calibration standards at the time of <br />analysis. These solutions are also to be used for "standard additions". <br />3. The calibration standard should be diluted to contain 0.5% (v/v) HNO~. <br />Sample Preservation <br />1. For sample handling and preservation, see part 4.1 of the Atomic Absorption Methods <br />section of this manual. <br />Sample Preparation <br />1. Prepare as described under "direct aspiration method". Sample solutioru for analysis <br />should contain 0.5% (v/v) HNO~. <br />Instrument Parameters (Genera]) <br />1. Drying Time and Temp: 30sec-125°C. <br />2. Aching Time and Temp: 30 sec~00°C. <br />3. Atomizing Time and Temp: IOcec-2700°C. <br />4. Purge Gas Atmosphere: Argon <br />5. Wavelength: 328.1 nm <br />6. Other operating parameters should be set as specified by the particular instrument <br />manufacturer. <br />Analysis Procedure <br />1. For the analysis procedure and the calculation, see "Furnace Procedure" part 9.3 of the <br />Atomic Absorption Methods section o(this manual. <br />Approved for NPDES and SD\VA <br />Issued 1978 <br />272.2- I <br />