Notes:
1. Complexed iron may be measured by increasing the development period until no further
colour development is seen. Very strongly complexed iron may not be included in the
measured iron. In this case the complexing agent must be destroyed by oxidation with
acid/persulphate followed by neutralisation to pH 6–9.
2. For total iron (suspended and dissolved), boil sample with acid/persulphate. Neutralise
back to pH 6–9 making back up to original volume with distilled or deionised water.
3. When using KS61 (Ferrozine/Thioglycolate), high levels of molybdate will produce an
intense yellow colour.
In this case a reagent blank is required:
• Use two clean vials (24 mm Ø).
• Mark one as blank for zeroing.
• Fill the blank with 10 ml sample.
• Add 10 drops KS63 (Thioglycolate).
• Close the vial tightly with the cap and swirl gently several times.
• Place the blank in the sample chamber making sure that the marks
are aligned.
• Press ZERO key.
• Remove the vial from the sample chamber.
• Fill a second clean 24 mm vial with 10 ml water sample (this is the sample).
Perform as described on page 74:
• Fill the vial with drops of the same size by holding the bottle vertically and squeeze
slowly:
10 drops KS61 (Ferrozine / Thioglycolate)
• Close the vial tightly with the cap and invert several times to mix the contents.
• Place the vial in the sample chamber making sure that the
marks are aligned.
• Wait for a reaction period of 5 minutes (Note 1).
(Countdown can be activated, see page 57)
• The method symbol flashes for approx. 3 seconds.
• The result is shown in the display in mg/l Iron.
Reagent / Accessories Form of reagent/Quantity Order-No.
KS61 (Ferrozine/ Thioglycolate)
KS63 (Thioglycolate Reagent)
Liquid reagent / 65 ml
Liquid reagent / 65 ml
56L006165
56L006365
Membrane-filter-set 25 filter 0,45 µm
2 syringe 20 mL
366150
GB
Methods
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