Protection Standard addition. The 5-31. water below which no adverse health effects are likely to occur. Agency sets guidelines for the level of contaminants in drinking using anodic stripping voltammetry, a very sensitive electro- chemical method. The blank-corrected current at -0.68 Vis The limit for thallium is 0.5 µg/L. Thallium (TI) was measured proportional to the concentration of thallium. Repeated additions of 5.0 µL of a 100-µg/L TI* standard were made to a 5.00-ml. sample solution. Blank subtracted current (A) 0.08 0.06- 0.04 0.02 0.00 -0.80 20-μL spike 15-μL spike 10-μL spike 5-μL spike No spike -0.60 -0.75 -0.70 -0.65 Voltage (V versus Ag | AgCl reference) -0.55

Protection Standard addition. The 5-31. water below which no adverse health effects are likely to occur. Agency sets guidelines for the level of contaminants in drinking using anodic stripping voltammetry, a very sensitive electro- chemical method. The blank-corrected current at -0.68 Vis The limit for thallium is 0.5 µg/L. Thallium (TI) was measured proportional to the concentration of thallium. Repeated additions of 5.0 µL of a 100-µg/L TI* standard were made to a 5.00-ml. sample solution. Blank subtracted current (A) 0.08 0.06- 0.04 0.02 0.00 -0.80 20-μL spike 15-μL spike 10-μL spike 5-μL spike No spike -0.60 -0.75 -0.70 -0.65 Voltage (V versus Ag | AgCl reference) -0.55

Principles of Instrumental Analysis

7th Edition

ISBN:9781305577213

Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Publisher:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Chapter24: Coulometry

Section: Chapter Questions

Problem 24.4QAP: Halide ions can he deposited at a silver anode, the reaction being Ag(s) + X- AgX(s) +e- Suppose...

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Question

in ppm Pb(l)
5-31.
Standard addition. The U.S. Environmental Protection
water below which no adverse health effects are likely to occur.
Agency sets guidelines for the level of contaminants in drinking
using anodic stripping voltammetry, a very sensitive electro-
chemical method. The blank-corrected current at -0.68 Vis
The limit for thallium is 0.5 µg/L. Thallium (TI) was measured
of 5.0 µL of a 100-µg/L TI standard were made to a 5.00-ml.
proportional to the concentration of thallium. Repeated additions
sample solution.
Blank subtracted current (A)
0.08
0.06
0.04
0.02
0.00
-0.80
20-μL spike
15-μL spike
10-μL spike
5-μL spike
No spike
-0.60
-0.75
-0.70
-0.65
Voltage (V versus Ag | AgCl reference)
-0.55
Standard additions of TI* to an unknown solution [Data from F. Ciepiela and K
Węgiel, "Novel Method for Standard Addition Signal Analysis in Voltammetry Analyst 2017.
142, 1729.]
(a) Measure the responses in the figure and prepare a graph to find
out how much T1+ was in the unspiked sample. Is the calibration
linear?
(b) Determine the amount of Tl* (ug/L) in the unspiked sample.
(c) Find the 95% confidence interval for Tl* in the sample.

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