Hach DR2400 Manual page 335

5.
Touch the timer icon.
Touch .
OK
A three-minute reaction
period will begin.
Sample Collection, Storage and Preservation
Accuracy Check
Method Performance
IronFer_AVPP_Other_PHE_Eng_Ody.fm
25 mL
20 mL
10 mL
6.
When the timer
beeps, place the blank
into the cell holder.
Collect samples in plastic or glass bottles. Analyze samples as soon as possible
after collection.
Standard Solution Method
1. Prepare a ferrous iron stock solution (100-mg/L Fe
0.7022 grams of Ferrous Ammonium Sulfate, hexahydrate, in deionized
water. Dilute to one liter in a Class A volumetric flask. In a 100-mL Class A
volumetric flask, dilute 1.00 mL of this solution to 100 mL with deionized
water to make a 1.0-mg/L standard solution. Prepare this solution
immediately before use. Perform the iron procedure as described above.
2. To adjust the calibration curve using the reading obtained with the
2+
1.0-mg/L Fe Standard Solution, touch
menu. Touch
Standard Adjust
3. Touch . Touch
On Adjust
concentration is used, touch the number in the box to enter the actual
concentration, then touch
See Section 3.2.4 Adjusting the Standard Curve on page 40 for more information.
Precision
Standard: 1.000 mg/L Fe
Program
255
257
See Section 3.4.3 Precision on page 44 for more information, or if the standard
concentration did not fall within the specified range.
Zero
7.
Touch .
Zero
The display will show:
2+
0.00 mg/L Fe
Options
.
to accept the displayed concentration. If an alternate
. Touch .
OK Adjust
95% Confidence Limits of Distribution
0.989–1.011 mg/L Fe
0.977–1.023 mg/L Fe
Iron, Ferrous
8.
Place the AccuVac
Ampul into the cell
holder.
Touch .
Read
Results will appear in
2+
mg/L Fe .
2+
) by dissolving
on the current program
Iron, Ferrous
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