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:. o a <br />xott:s <br />I. The above concentration values and instrument conditions are for aPerkin-Elmer HGA- <br />2100, based on the use oCa 20 ul injection, continuous flow purge gas and non-pyrolytic <br />graphite. Smaller size furnace devices or those employing faster rates of atomization can <br />be operated using lower atomization temperatures for shorter time periods than the <br />above recommended settings. <br />2. Background correction may be required if the sample contains high dissolved solids. <br />3. The use of halide acids should be avoided. <br />4. If adsorption to container walls or Cormation of AgCI is suspected, see NOTE 3 under the <br />Direct Aspiration Method 272.1. <br />5. For every sample matrix analyzed, verification is necessary to determine that method of <br />standard addition is not required (see part 5.2.1 of the Atomic Absorption Methods <br />section of this manuall. <br />6. For quality control requirements and optional recommendations for use in drinking <br />water analyses, see part IO of the Atomic Absorption Methods section of this manual. <br />7. IC method of standard addition is required, follow the procedure given earlier in part 8.5 <br />of the Atomic Absorption Methods section of this manual. <br />8. Data to be entered into STOREY must be reported as ug/l. <br />_, <br />Precision and Accuracy: <br />1. In a single laboratory (EMSL), using Cincinnati, Ohio tap Hater spiked at concentrations <br />of 25, 50, and 75 ug Ag/l, the standard deviations were •0.4, X0.7, and -0.9, <br />respectively. Recoveries at these levels were 949c. IOO~ic and 104~Jc, respectively. ) <br />272.2-2 <br />