Calculate the concentration of zinc within the water sample

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Reference no: EM133761207

Question: Std Addition results from Flame Atomic Absorption Spectroscopy - Zinc added into Derwent River Estuary water samples - Collected samples were not acidified upon collection.

	Conc. Added	Response (absorbance - AU)			SUM	Av (AU)	SDEV
	mg/L	Reading No.1	No.2	No.3
EXP.1
Sample	0	4.1	3.95	3.79	11.840	3.947
Spike 1	0.1	5.33	5.12	5.42	15.870	5.290
Spike 2	0.15	5.85	5.9	5.78	17.530	5.843
Spike 3	0.2	8.12	8.2	8.23	24.550	8.183
Spike 4	0.25	8.67	8.55	8.58	25.800	8.600
Spike 5	0.5	12.34	12.28	12.31	36.930	12.310
Spike 6	1	21.67	21.59	21.64	64.900	21.633
Spike 7	2	35.88	35.9	35.95	107.730	35.910

STD ADD	Av (AU)
0
0.1
0.15
0.2
0.25
0.5
1
2

Question (1) Complete the Table to the left. Comment on any trends you might note in the standard deviation?

Question (2) Plot the standard addition calibration graph (using average AU data). Title and label axis correctly. Insert trendline and include equation and R2 values on graph. Extend trendline backwards. (Insert the graph to the right of this text-box.)

Question (3) From the best-fit equation, calculate the concentration of zinc within the water sample.

Question (4) Postulate the source of Zn within the Derwent Estuary and suggest a literature reference to support this.

Zn. Calibration Standards (mg/L) Acidified with 5% HNO3.

STD CAL	Av (AU)
0	0
0.1	1.45
0.15	2.64
0.2	3.7
0.25	4.8
0.5	9.51
1	18.97
2	39.67

Question (4) Now construct a standard calibration graph (again titled and labelled corectly) using the calibration data to the left). Again include a trendline and include equation and correlation coeffient (R2) on the graph. (Insert graph to right of this textbox.)

Question (5) Comment on the differnce between the standard addition graph above right and the standard calibration curve right.

Question (6) Using the absorbance value for unspiked Derwent Estuary river water sample above, calculate the concentration of zinc in river water using the standard calibration curve right, and comment upon the % difference observed from your above standard addition obtained value.

Std Addition - Zinc into river water - Samples Acidified.
	Conc. Added	Response (AU)
	mg/L	Averaged reading
EXP.2
Sample	0	4.1
Spike 1	0.1	5.7
Spike 2	0.15	7.1
Spike 3	0.2	9.12
Spike 4	0.25	10.3
Spike 5	0.5	14.39
Spike 6	1	23.98
Spike 7	2	43.23

Question (7) Now plot a second standard addition calibration curve using the data to the left, which was obtained using acid stabilised samples. (Place to the right, label, and add trendline, equation, extend to baseline etc.)

Question (8) Calculate the concentration of zinc in river water sample using this new standard addition calibration.

Question (9) Comment upon differences between slopes of all three graphs and speculate as to the resasons.

Question (10) Comment upon the differences in calculated values for zinc in river water samples from each calibration curve, and give reasons for those differences.

Question (11) Conclude which methodology is best taken in the future for this particular analytical senario.

Reference no: EM133761207

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len3761207

9/12/2024 12:42:43 AM

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