Iron, Ferrous
Iron, Ferrous
IronFer_AVPP_Other_PHE_Eng_Ody.fm Page 3 of 4
Sample Collection, Storage and Preservation
Collect samples in plastic or glass bottles. Analyze samples as soon as possible
after collection.
Accuracy Check
Standard Solution Method
1. Prepare a ferrous iron stock solution (100-mg/L Fe
2+
) by dissolving
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
1.0-mg/L Fe
2+
Standard Solution, touch Options on the current program
menu. Touch
Standard Adjust.
3. Touch
On. Touch Adjust to accept the displayed concentration. If an alternate
concentration is used, touch the number in the box to enter the actual
concentration, then touch
OK. Touch Adjust.
See Section 3.2.4 Adjusting the Standard Curve on page 40 for more information.
Method Performance
Precision
Standard: 1.000 mg/L Fe
See Section 3.4.3 Precision on page 44 for more information, or if the standard
concentration did not fall within the specified range.
5. Touch the timer icon.
Touch
OK.
A three-minute reaction
period will begin.
6. When the timer
beeps, place the blank
into the cell holder.
7. Touch Zero.
The display will show:
0.00 mg/L Fe
2+
8. Place the AccuVac
Ampul into the cell
holder.
Touch
Read.
Results will appear in
mg/L Fe
2+
.
10 mL
20 mL
25 mL
Zero
Program 95% Confidence Limits of Distribution
255 0.989–1.011 mg/L Fe
257 0.977–1.023 mg/L Fe
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