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• <br />\otes <br />1. The above concentration values and instrument conditions are for aPerkin-Elmer HGA- <br /> 2100, based on the use of a 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 adsoretion to container walls or formation of AgCI is suspected, see NOTE 3 under the <br /> , .IJirect Aspiration Method 272.1. <br />S. 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 thismanuall. ___ -_: - . -. ._ <br />6. For quality-control requirements and optional recommendations for use in drinking <br /> water analyses, see part 10 of the Atomic Absorption Methods section of this manual. <br />7. If 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/ 1. <br /> <br />__ _. - <br />Precision and Accuracy: <br />1. In a sinele laboratory (EMSL), using Cincinnati, Ohio tap water spiked a[ concentrations <br />• of 25, 50, and 75 ug Ag/1, the standard deviations were -0.4, .0.7, and -0.9, <br />respectively. Recoveries at these levels were 94~c. 1005'c and 104%, respectively. j <br />L J <br />?7?.?-2 <br />