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613 Aspirate the ketone layer, record the mstrument readmg for each sample and standard agamst the blank Repeat, and average the duphcate results 7 CalculatlOns 7 1 Determme the ug/l Cr m each sample from a plot of the mstrument readmgs of standards A workmg curve must be prepared with each set of samples Report Cr concentratlOns as follows Less than 10 ug/l, nearest ug/l, 10 ug/l and above, two slgmficant figures 8 PreclslOn and Accuracy 8 1 PrecIsion and accuracy data are not aval1able at this time 9 Reference 9 1 AtomiC AbsorptlOn Newsletter 6, p 128 (1967) 2183-3PDF Image | Methods for Chemical Analysis of Water and Wastes
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