Volume correcting volumetric readings

There are two different approaches for properly correcting volumetric readings caused by environmental variations because there are two approaches to making volumetric readings those done by reading volume directly from volumetric ware, and those made indirectly by weight. 

Three or four aliquots of the sample solution are transferred to volumetric flasks and known, different amounts of a standard solution of the analyte element are added to each of these except one. The solutions in the flasks are then made up to volume. These solutions plus a reagent blank are then run in the electrothermal atomizer. Each reading should have the blank subtracted before plotting. The sample result is then itself blank-corrected. 

A stock solntion (1.0 x 10 " moldm ) of NaCl was prepared. Standards were made by adding 2.0, 3.0, 4.0, 6.0 or 10.0 cm of the stock solution to a 100 cm volumetric flask 5cm of MeCN were added to each flask which was then filled to the 100 cm mark with deionized water. A blank was also prepared. The sample for analysis was prepared by dissolving 8.90 mg of [X][PF6l2 xNalPFgl in 2.5 cm of MeCN in a 50 cm volumetric flask. This was filled to the mark with deionized water. This solution was diluted 10-fold with a 5% (by volume) MeCN/water solution. Using a sodinm hollow cathode lamp (A = 589nm), AAS was nsed to determine the absorbance of each standard. Each absorbance reading was corrected for the absorbance of the blank and the data are tabulated below ... 

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