Introduction to Analytical Chemistry

Which is the most important factor when choosing a method for trace analysis?

• budget

• accuracy

• limit of detection

• run time

In general, a collected ____________ must represent the characteristics of a larger population, material, lot, etc.

• aliquot

• aggregate

• bulk

• sample

____________ samples are quite costly and are defined as very large samples taken from a material.

• Representative

• Bulk

• Random

• Composite

_____________ samples are chosen entirely by chance and are typically obtained from random heterogeneous materials.

• Random

• Uniform

• Hetergeneous

• Representative

A ____________ sample is one where every part of the sample does not have a uniform consistency.

• Homogeneous

• Uniform

• Heterogeneous

• Composite

Soil cores are collected from defined areas and combined into a single meld. This is an example of ____________ sampling.

• Random

• Bulk

• Composite

• Lot

________and __________ samples are the easiest type to samples to obtain and prepare due to their stable composition.

• Static, homogeneous

• Static, heterogeneous

• Dynamic, homogeneous

• Dynamic, heterogeneous

Bottles of "pure honey" were sampled by FDA to check the authenticity of their claim. What kind of sampling was done?

• Random

• Representative

• Selective

• Composite

Which of the following is NOT a method used in the dissolution of samples?

• Microwave decomposition

• Acid dissolution

• Preparation of fluxes

• Crushing

Which of the following <method:parameter measured> is an example of a classical method of quantitative analysis?

• potentiometric analysis: voltage

• thermogravimetric analysis: mass

• atomic absorption spectroscopy: %transmittance

• chromatography: peak area