Hach 59530-16, Instruction Manual

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Molybdenum, Molybdate, HR,
continued
Sampling and Storage
Collect samples in glass or plastic bottles.
Accuracy Check
Standard Additions Method
1. Snap the neck off a Molybdenum Standard Solution as Mo 75 mg/L Voluette®
ampule.
2. Use a TenSette® Pipet to add 0.1 mL, 0.2 mL, and 0.3 mL of standard,
respectively, to three 20-mL samples. Mix each thoroughly.
3. Analyze each sample as described above. The molybdenum concentration
should increase approximately 0.38 mg/L for the low range and 1.6 mg/L for
the high range for each 0.1 mL of standard added.
Standard Solutions Method
For the Low Range, use Class A glassware to prepare a 2.00-mg/L molybdenum
standard solution by pipetting 10.00 mL of Molybdenum Standard Solution, 10.00-
mg/L, into a 50-mL volumetric flask. Dilute to the mark with deionized water. For
the High Range, use the 10.0 mg/L standard directly. Dilute to the mark with
deionized water. Prepare this solution daily. Perform the molybdenum procedure.