Faas Lead Analysis By Constant Volume Standard Addition Assume We Wish To Find The Lead Pb Concentration In Ppb For A 1 (155.08 KiB) Viewed 43 times
Faas Lead Analysis By Constant Volume Standard Addition Assume We Wish To Find The Lead Pb Concentration In Ppb For A 2 (92.45 KiB) Viewed 43 times
FAAS Lead Analysis by Constant-Volume Standard Addition. Assume we wish to find the Lead (Pb) concentration in ppb for a lake water sample (the "unknown"). Using a pipette, 10.00 mL of lake water is loaded into five 50 mL volumetric flasks. Next, exactly 0.00,5.00,10.00,15.00 and 20.00 mL of standard lead solution at 4.96ppb (parts per billion) is added. After dilution to the volume, FAAS readings at λ=283 nm are taken of the five solutions. The resulting absorbance values are presented below. Table 2-1. FAAS Lake Water Sample Lead Analysis. FAAS Absorbance Readings for Lead Standard Volume Additions
1. Standard Addition A283 vs. VS Plot for the Lake Water Sample. Plot in EXCEL the A283 vs. VS data. You may find pages 1 - 7 of the Lab 2 Supplement - EXCEL Graphing \& LINEST document on D2L particularly helpful. Include the R2 value and the equation of the linear trend-line (both from EXCEL). You will likely need to adjust the sig fig display for the R2 value and linear trend-line equation in EXCEL. Properly title the plot and label the axes correctly. Use reasonable sig figs and correct units. Paste in the complete plot below.
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