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Guidelines for Sample Preparation
High (> 10
Lead conc. level
High or mean (> 10
-3
Low (< 10
)
High (> 10
Lead conc. level
High or mean (> 10
-3
Low (< 10
)
Mean (10
Lead conc. level
Mean or low (< 10
-1
) and variable ionic strength of sample
Action
-3
)
Dilute standards and samples
100 times with 0.1 M KNO
solution.
Reliable direct results not obtain-
able because ionic strength of
standard cannot be properly
adjusted. Other methods, e.g.
standard addition or subtraction,
must be employed.
-1
) and constant ionic strength of sample
Action
-3
)
Dilute standards and samples
100 times with 0.1 M KNO
solution.
Add KNO
obtain same ionic strength as in
sample.
-1
-3
- 10
) ionic strength of sample
Action
-2
)
Add KNO
samples to obtain a high ionic
strength level compared with
the sample's ionic strength.
Ionic strength > 10
to the standards to
3
to both standards and
3
5
3
3
-2
.
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