## Question

###### A, b, and c please 1. A determination of silver in waste water was done with...

a, b, and c please

1. A determination of silver in waste water was done with a method involving spling silver into the sample. A sample originally containing no silver was run six times with the following protocol. Each 100.0 mL sample was spiked with 200 g of silver and mixed well. From each of these prepared samples, a 5.00 mL aliquot was digested and the following results were obtained ug Ag found: 9.8, 9.2.9.3,9.5, 10.1, 8.9, 96, 9.4 a. What is the theoretical recovery value for silver in this experiment? (8 pts) b. Determine the mean and the relative standard deviation for this analysis. (You may use a spreadsheet or graphing calculator). (6 pts) C. Does this method recover the silver at a 95% confidence limit? Provide a calculation to support your answer. (8 pts)

## Answers

a.

100 mL original sample was spiked with : 200 ug silver

5 mL aliquots it were digested :

thus, theoretical recovery value of silver : (5 mL/ 100 mL )* 200 ug = 10 ug

b.

Sum, Σx: 75.8 Mean, x̄:9.475 ugVariance, s2: 0.13643

Steps

s2 =

Σ(xi - x̄)2 N - 1 =

0.955 7 = 0.13643

s = √0.13643 = 0.37 ug % RSD = S.D./mean *100 =

3.9 %

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