Thermo Scientific Orion AquaMate UV-Vis, Руководство пользователя

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Chapter 5
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Orion AQUAfast Reagent Chemistry Instructions for Orion AquaMate
112 | Orion AquaMate Spectrophotometer User Manual Thermo Scientific
AC2016 Sulfide Tablet Test
DPD/Catalyst Method
0.04 – 0.5 mg/l S
1. Load and run the AC2016 method.
2. Fill a clean AQUAfast 24mm round vial, Cat. No. AC2V24, with 10 ml of sample. Close the
vial tightly with the cap. Wipe the exterior of the vial.
3. Place the vial into the holder in the sample chamber and close the chamber door.
4. Press the Measure Blank function key to measure the blank.
5. Open the sample chamber door and remove the vial from the holder.
6. Add one Sulfide No. 1 Tablet straight from the foil into the vial. Crush the tablet with a clean
stir rod.
7. Add one Sulfide No. 2 Tablet straight from the foil into the same vial. Crush the tablet with
a clean stir rod.
8. Close the vial tightly with the cap and swirl or invert several times until the tablets are
dissolved. Wipe the exterior of the vial.
9. Wait for a reaction period of 10 minutes.
10. Place the vial into the holder in the sample chamber and close the chamber door.
11. Press the Measure Sample function key to display the result in mg/l sulfide.
Notes:
• The tablets must be added in the correct sequence.
•
Chlorine and other oxidizing agents that react with DPD do not interfere with the test.
• To avoid loss of sulfide collect the sample carefully with a minimum of aeration. It is
essential to test the sample immediately after collection.
• The sample temperature should be 20 °C. A different temperature can lead to higher or
lower results.