(a) Interpretation: The concentration in samples that yielded absorbance of 0.143 should be expressed in ppm. The relative standard deviation of the result should be calculated. The calculation should be repeated assuming the absorbance data are means of three measurements. Concept introduction: Standard deviation of the results obtained from the calibration curve = s c = s r m 1 M + 1 N + ( y ¯ c − y ¯ ) 2 m 2 S x x M − number of replicates N- number of calibration points.

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Principles of Instrumental Analysis

7th Edition
Douglas A. Skoog + 2 others
Publisher: Cengage Learning
ISBN: 9781305577213
BuyFind

Principles of Instrumental Analysis

7th Edition
Douglas A. Skoog + 2 others
Publisher: Cengage Learning
ISBN: 9781305577213

Solutions

Chapter 14, Problem 14.12QAP
Interpretation Introduction

(a)

Interpretation:

The concentration in samples that yielded absorbance of 0.143 should be expressed in ppm. The relative standard deviation of the result should be calculated. The calculation should be repeated assuming the absorbance data are means of three measurements.

Concept introduction:

Standard deviation of the results obtained from the calibration curve = sc=srm1M+1N+(y¯cy¯)2m2Sxx

M − number of replicates

N- number of calibration points.

Interpretation Introduction

(b)

Interpretation:

The concentration in samples that yielded absorbance of 0.675 should be expressed in ppm. The relative standard deviation of the result should be calculated. The calculation should be repeated assuming the absorbance data are means of three measurements.

Concept introduction:

Standard deviation of the results obtained from the calibration curve = sc=srm1M+1N+(y¯cy¯)2m2Sxx

M − number of replicates

N- number of calibration points.

Interpretation Introduction

(c)

Interpretation:

The concentration in samples that yielded absorbance of 0.068 should be expressed in ppm. The relative standard deviation of the result should be calculated. The calculation should be repeated assuming the absorbance data are means of three measurements.

Concept introduction:

Standard deviation of the results obtained from the calibration curve = sc=srm1M+1N+(y¯cy¯)2m2Sxx

M − number of replicates

N- number of calibration points.

Interpretation Introduction

(d)

Interpretation:

The concentration in samples that yielded absorbance of 1.009 should be expressed in ppm. The relative standard deviation of the result should be calculated. The calculation should be repeated assuming the absorbance data are means of three measurements.

Concept introduction:

Standard deviation of the results obtained from the calibration curve = sc=srm1M+1N+(y¯cy¯)2m2Sxx

M − number of replicates

N- number of calibration points.

Interpretation Introduction

(e)

Interpretation:

The concentration in samples that yielded absorbance of 1.512 should be expressed in ppm. The relative standard deviation of the result should be calculated. The calculation should be repeated assuming the absorbance data are means of three measurements.

Concept introduction:

Standard deviation of the results obtained from the calibration curve = sc=srm1M+1N+(y¯cy¯)2m2Sxx

M − number of replicates

N- number of calibration points.

Interpretation Introduction

(f)

Interpretation:

The concentration in samples that yielded absorbance of 0.546 should be expressed in ppm. The relative standard deviation of the result should be calculated. The calculation should be repeated assuming the absorbance data are means of three measurements.

Concept introduction:

Standard deviation of the results obtained from the calibration curve = sc=srm1M+1N+(y¯cy¯)2m2Sxx

M − number of replicates

N- number of calibration points.

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