Topic Five ~ Analytical Analysis
Aim
-
Defining
the analytical problem needing solution (determine level of ammonium pollution
in KT Estuary)
Sampling Design
-
Consider
(ammonium analysis):
o
Number of
samples
o
Depth
profile
o
Tidal
conditions
o
Seasonal
change
Methods
-
Choices:
o
Hach kit
o
Ion
chromatography
o
Ion
analyser
o
Distillation
method
o
Spectrophotometry
method
-
Selection
factors:
o
Accuracy
o
Detective
limit
o
Analysis
selectivity
o
Time
o
Cost
o
Legality
(Std method)
Quantitative
Measurement
-
Measurement
of [chemical] in sample referring to std curve
-
S = kA
S
= signal/response of analysis
k
= proportional constant
A
= [chemical]
Evaluation
-
Confidence
level = reproducibility / reliability
-
Determination
of confidence level:
o
Reference
standard materials (RSM)
o
Internal
& external standards (IS & ES)
o
Recovery
test
o
Spiking
analytical technique
Statistical analysis
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