Hach DR/850 - Page 82

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g) The spiked sample result should reflect the analyzed
sample result + the calculated mg/L Br
2
added (step f).
h) If this increase does not occur, see Standard Additions in
Section 1 for more information.
Method Performance
Precision
In a single laboratory using a standard solution of 2.34 mg/L
bromine and two representative lots of reagent with the
instrument, a single operator obtained a standard deviation of
±0.02 mg/L bromine.
In a single laboratory using a standard solution of 2.31 mg/L
bromine and two representative lots of AccuVac Ampuls with the
instrument, a single operator obtained a standard deviation ± 0.02
mg/L bromine.
Estimated Detection Limit
The estimated detection limit for program 5 is 0.04 mg/L Br
2
and
0.03 mg/L Br
2
for program 6. For more information on derivation
and use of Hach’s estimated detection limit, see Section 1.
mg/L Bromine added
0.2 (vol. standard added) Label value (mg/L Chlorine)× 2.25×
25.2 (sample + standard volume)
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BROMINE, continued