SC CHEM 321 - Determination of Total Fe in Sediment Samples (3 pages)

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Determination of Total Fe in Sediment Samples



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Determination of Total Fe in Sediment Samples

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Pages:
3
School:
University Of South Carolina-Columbia
Course:
Chem 321 - Quantitative Analysis

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Cameron Kahn Muditha Dias Experiment 5 Postlab 26 March 2014 Experiment 5 Determination of Total Fe in Sediment Samples 1 Show all data from steps 2 13 14 Amount Wavelength Absorbance 0 2296 562 0 2307 562 0 2299 562 Standard deviation 0 00056862 Average 0 23006667 Site 3 Wavelength Absorbance 0 4831 562 0 4829 562 0 4826 562 Standard deviation 0 00025166 Average 0 48286667 Sample Sample Site 3 Site 10 1 0055g 1 0108g 1 0133g Site 10 Absobanc Wavelength e 0 8471 562 0 8464 562 0 8433 562 Standard deviation 0 0020224 Average 0 8456 1mL of Site 10 with 3mL Blank of Ferrozine Absorbance Wavelength Absorbance Wavelength 0 8861 562 0 0677 562 0 8875 562 0 0678 562 0 888 562 0 0677 562 Standard Average deviation 0 8872 5 7735E 05 Standard deviation 0 00098489 Average 0 06773333 2 Calculate the success of your recovery standard analysis Report Fe recovered in mg Fe g sample Solve for the standard deviation and 95 confidence interval of your answer Did you recover the same amount to the 95 level of confidence Dilution factor of 2 5 Concentration of Iron 2mL Sample 2mL Ferrozine M trial 1 trial 2 trial 3 Average Sample 1 45E 05 1 46E 05 1 45E 05 1 45E 05 Site 3 3 72E 05 3 72E 05 3 72E 05 3 72E 05 Site 10 6 98E 05 6 98E 05 6 95E 05 6 97E 05 theoretical yield 19 1 0055 0 191mg 1 1 45E 05 3500 1 0055 0 0505mg g 1 46E 05 3500 1 0055 0 0508 mg g 1 45E 05 3500 1 0055 0 0505 mg g Average 0 0506 mg g Standard Deviation 0 000173 0506 100 26 49 recovery 191 Confidence interval 0 0506 z mg g 0 0506 4 303 000173 0 0506 7 44e 4 We did not recover the same amount to the 95 level of confidence 3 Calculate the concentration of iron in mg Fe g sample in both of your samples taking into account the recovery standard and absorbance blank Show your calculations and commute error from the recovery standard calculation the commute error was just the standard deviation for both samples site 3 and site 10 A b c Where A absorbance average of absorbance average of blank molar absorbance coefficient



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