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WorksheetsPreparing sample for analysis
Total questions: 10
Worksheet time: 20mins
For a solid sample, which sampling techniques can be used to obtain a representative sample?
grab sampling
continuous sampling
both
Solid sample need to be treated before a representative sample can be obtained. Select the treatment procedure that can be done.
grind the sample into smaller particle size
heating the sample
both
Storing sample in a suitable container is important, EXCEPT
to avoid contamination
to prevent decomposition
to prevent heat loss
to prevent lost of analyte
Sample contains metal should be stored in
plastic container
glass container
both
The following problems can occur during storage of sample, EXCEPT
loss of analyte due to vaporization
side reaction
decomposition by bacteria
spillage
Sample contains organic substance can be eliminated by performing
total dissolution
wet digestion
drying
When preparing a representative sample, we should avoid the following, EXCEPT
losing any analyte
adding new interference
preparing sample in its best size and form
Which of the following is NOT a technique used to eliminate interferences?
distillation
precipitation
solid-liquid extraction
filtration
Dry ashing is a process to eliminate
inorganic substance by heating in a furnace
organic substance by heating in a furnace
organic substance by dissolving in oxidizing acid
analytes are
samples to be analyzed
components of sample to be analyzed
representative samples
