WKS 276230 Manual De Instrucciones página 45

Methods
GB
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 m
• Mark one as blank for zeroing.
• Fill a clean vial (24 mm Ø) with
10 drops KS63 (Thioglycolate).
• Add
• Close the vial tightly with the cap and swirl gently several times.
• Place the blank in the sample chamber making sure that the marks
ZERO key.
• Press
• Remove the vial from the sample chamber.
• Fill a second clean 24 mm vial with
• Follow the procedure as described on page 46:
Fill the vial with drops of the same size by holding the bottle vertically and squeeze
slowly:
10 drops KS61 (Ferrozine / Thioglycolate)
Then proceed as described.
Reagent / Accessories
KS61 (Ferrozine / Thioglycolate)
KS63 (Thioglycolate Reagent)
Membrane-filter-set
m Ø).
10 ml of the water sample (blank).
10 ml water sample (this is the sample).
Form of reagent/Quantity
Liquid reagent / 65 ml
Liquid reagent / 65 ml
25 filter 0,45 µm
2 syringe 20 mL
are aligned.
Order-No.
56L006165
56L006365
366150