INSTRUMENTAL ANALYSIS-ACCESS >CUSTOM<
INSTRUMENTAL ANALYSIS-ACCESS >CUSTOM<
7th Edition
ISBN: 9781337783439
Author: Skoog
Publisher: CENGAGE C
Question
Book Icon
Chapter 32, Problem 32.8QAP
Interpretation Introduction

(a)

Interpretation:

The counting rate 9cpm is the background counting rate in the laboratory which was measured at the time period of 3 min and it is required that the value of standard relative deviation should be less than the 5% (σRc/Rc<0.05). The total number of count is to be determined when the counting rate is 50cpm.

Concept introduction:

The formula for the standard deviation for the corrected counting rate is given as-

σRc=Rxtx+Rbtb ……. (1)

Where,

Rx = counting rate for sample

Rb = counting rate for background

tx = time required for counting rate for sample

tb = time required for counting rate for background

σRc = standard deviation for the corrected counting rate

Relative standard deviation is represented by the following formula-

=σRcRc …… (2)

Also,

Rc=RxRb

Interpretation Introduction

(b)

Interpretation:

The counting rate 9cpm is the background counting rate in the laboratory which was measured at the time period of 3 min and it is required that the value of standard relative deviation should be less than the 5% (σRc/Rc<0.05). The total number of count is to be determined when the counting rate is 300cpm.

Concept introduction:

The formula for the standard deviation for the corrected counting rate is given as-

σRc=Rxtx+Rbtb ……. (1)

Where,

Rx = counting rate for sample

Rb = counting rate for background

tx = time required for counting rate for sample

tb = time required for counting rate for background

σRc = standard deviation for the corrected counting rate

Relative standard deviation is represented by the following formula-

=σRcRc …… (2)

Also,

Rc=RxRb

Blurred answer
Students have asked these similar questions
Draw product B, indicating what type of reaction occurs. F3C CF3 NH2 Me O .N. + B OMe
Benzimidazole E. State its formula. sState the differences in the formula with other benzimidazoles.
Draw product A, indicating what type of reaction occurs. F3C CN CF3 K2CO3, DMSO, H₂O2 A
Knowledge Booster
Background pattern image
Similar questions
SEE MORE QUESTIONS
Recommended textbooks for you
Text book image
Principles of Instrumental Analysis
Chemistry
ISBN:9781305577213
Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher:Cengage Learning
Text book image
Fundamentals Of Analytical Chemistry
Chemistry
ISBN:9781285640686
Author:Skoog
Publisher:Cengage
Text book image
Appl Of Ms Excel In Analytical Chemistry
Chemistry
ISBN:9781285686691
Author:Crouch
Publisher:Cengage