PASCO EZ-2331 Iron ezSample Test Kit - Manual (Page 2)

Digestion procedure for insoluble iron :
a. Fill a heat-resistant, glass container to 25 mL with sample.
b. Add 5 drops of A-6000 Solution. Stir briefly.
c. Gently boil the sample to reduce volume to 10-15 mL.
d. Cool the sample and dilute to 25 mL with iron-free water.
e.
Using this pretreated sample, perform the Ferrous Iron Procedure beginning with Step 2
.
Accuracy and practical detection limit (PDL)
The lower limit of the stated test range is the “Practical Detection Limit (PDL)”, defined as the lowest concentration at
which less than ±30% error is routinely obtained. Accuracy may be compromised if test results are outside of the test
range. Test results obtained at or below the PDL should be further confirmed for best accuracy.
References
1. Method 3500-Fe B. APHA Standard Methods, 20th ed., p. 3-76, (1998).
2. Iron in Water, Test Method A. ASTM D. p. 1068-77.
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012-10107D
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