# (a) Interpretation: A working curve from the data should be constructed. Concept introduction: Standard addition method is used to analyze complex samples which matrix effect is significant. One common approach is standard addition technique is spiking of sample. In this method, one or more increments of a standard solution is added to the several aliquots of sample containing same volume. Each solution is then diluted to a fixed volume and experiment is proceeded. ### Principles of Instrumental Analysis

7th Edition
Douglas A. Skoog + 2 others
Publisher: Cengage Learning
ISBN: 9781305577213 ### Principles of Instrumental Analysis

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

#### Solutions

Chapter 15, Problem 15.8QAP
Interpretation Introduction

## (a)Interpretation:A working curve from the data should be constructed.Concept introduction:Standard addition method is used to analyze complex samples which matrix effect is significant. One common approach is standard addition technique is spiking of sample. In this method, one or more increments of a standard solution is added to the several aliquots of sample containing same volume. Each solution is then diluted to a fixed volume and experiment is proceeded.

Interpretation Introduction

### (b)Interpretation:A linear least-squares equation for the data should be determined.Concept introduction:Syy=∑(yi−y¯)2Sxx=∑(xi−x¯)2Sxy=∑(xi−x¯)(yi−y¯)The slope of the line, m=SxySxxThe intercept, b=y¯−mx¯

Interpretation Introduction

### (c)Interpretation:The standard deviation of the slope and intercept and the standard deviation about regression for the curve should be determined.Concept introduction:Standard deviation about regression, sr=Syy−m2SxxN−2N − number of points used.The standard deviation of the slope, sm=sr2SxxThe standard deviation of the intercept, sb=sr∑xi2N∑xi2−(∑xi)2

Interpretation Introduction

### (d)Interpretation:The concentration of Zn2+ in the sample should be calculated.Concept introduction:Standard addition method is used to analyze complex samples which matrix effect is significant. One common approach is standard addition technique is spiking of sample. In this method, one or more increments of a standard solution is added to the several aliquots of sample containing same volume. Each solution is then diluted to a fixed volume and experiment is proceeded.

Interpretation Introduction

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