Iron, Total, Tptz Method - Hach DR/850 Procedures Manual

IRON, TOTAL
*
TPTZ Method
(Powder Pillows or AccuVac Ampuls)
Using Powder Pillows
1.
Enter the stored
program number for iron
(Fe)- powder pillows.
Press:
PRGM
The display will show:
PRGM ?
Note: For most accurate
results, perform a Reagent
Blank Correction using
deionized water (see
Section 1).
Note: Adjust the pH of
stored samples before
analysis.
* Adapted from G. Frederic Smith Chemical Co., The Iron Reagents, 3rd ed. (1980).
(0 to 1.80 mg/L)
2.
Press:
39 ENTER
The display will show
mg/L, Fe and the
ZERO icon.
Note: Total iron
determination needs a
prior digestion. Use any of
the procedures in Digestion
(Section 2).
For water, wastewater, and seawater
3.
Fill a sample cell
with 10 mL of sample.
Note: Sample pH is
important in this test;
see Interferences.
Note: Rinse glassware with
a 1:1 hydrochloric acid and
deionized water before use
to avoid errors due to iron
deposits on the glass.
207
Method 8112
4.
Add the contents of
one TPTZ Iron Reagent
Powder Pillow (the
prepared sample). Cap
and shake the cell for
30 seconds.
Note: A blue color will
develop if iron is present.