Page 42 - Vogel's TEXTBOOK OF QUANTITATIVE CHEMICAL ANALYSIS

1 INTRODUCTION

figure is also an indication of the precision of the measurements. However, the
most important measures of precision are the standard deviation and the
variance: these are discussed in Chapter 4.
The difference between the most probable analytical result and the true value
for the sample is termed the systematic error in the analysis: it indicates the
accuracy of the analysis.

1.12 SUMMARY
Summarising, the following steps are necessary when confronted with an
unfamiliar quantitative determination.
1. Sampling.
2. Literature survey and selection of possible methods of determination.
3. Consideration of interferences and procedures for their removal.
Pooling the information gathered under headings (2) and (3), a final selection
will be made of the method of determination and of the procedure for eliminating
interferences.
4. Dissolution of sample.
5. Removal or suppression of interferences.
6. Performance of the determination.
7. Statistical analysis of the results.

For References and Bibliography see Sections 3.38 and 3.39.