Hach-Lange DR 5000 brewerie analysis, supplementary software LZV570 - Manual (Page 46)

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Working procedures
4. Prepare a blank value solution in exactly the same way, but
without adding the Ferrozin reagent. Prepare a blank value
solution for each beer.
5. Measure the absorbance of the solution in a 40 mm rectangular
cuvette at 560 nm against the corresponding blank value
solution.
Results
The results are expressed in mg/l to three significant places
Accuracy
r = 0.008
Required value
< 0.200 mg/l
Literature
MEBAK Brautechnische Analysenmethoden
4th Edition 2002 Volume II, pp 149ff
2.12.1 Procedure for measuring iron
1. Prepare samples and blank value solution as described in the
working procedure.
2. Select STORED PROGRAMS in the “Main Menu”. Select test
number 818 .
3. Insert blank value cuvette (see sample preparation) into the cell
compartment. Close the cell compartment. Touch ZERO .
4. Insert the sample cuvette containing the prepared sample into
the cell compartment. Close the cell compartment. Touch
READ . The result is displayed.
Note: Analysis of additional samples: Repeat working procedure from
point 3.