Hach Polymetron 9611sc PO43– LR Operaciones página 8

Items to collect:
• Sodium molybdate dihydrate, Na
quality, 90 g
• Concentrated sulfuric acid, H
bottle
• Potassium antimonyl tartrate trihydrate, C
analytical qualitiy, 1.66 g
• Volumetric flask, 2 L
• Laboratory funnel
• Deionized water, 2 L
• Ice water bath
• Analyzer Bottle #R1
1. Add approximately half of the deionized water to the volumetric flask.
2. Weigh 90 g of sodium molybdate dihydrate.
3. Add the sodium molybdate dihydrate to the flask. Mix fully. The
solution becomes warm.
4. Put the flask in an ice water bath until the solution becomes cool.
5. Stir the water and slowly add a small quantity of the sulfuric acid. The
solution becomes warm.
6. Stir the solution and add the remaining sulfuric acid in small
quantities. The solution becomes hot.
7. Put the flask in an ice water bath until the solution becomes cool.
8. Weigh 1.66 g of potassium antimonyl tartrate.
9. Add the potassium antimonyl tartrate trihydrate to the flask.
10. Stir the solution until the reagent fully dissolves.
11. Dilute to the mark with deionized water. Mix fully.
12. Add the solution to the analyzer bottle. Insert the seal assembly and
put the cap on.
Prepare Reagent 2
Use standard laboratory protocols during preparation.
Items to collect:
8 English
MoO ·2H O, > 99%, analytical
2 4 2
SO , 95–97%, analytical quality, 500 mL
2 4
H K O Sb ·3H O,
8 4 2 12 2 2
• Sodium dodecyl sulfate, CH
3
• Volumetric flask, 2 L
• Laboratory funnel
• Deionized water, 2 L
• Analyzer Bottle #R2
1. Add approximately half of the deionized water to the volumetric flask.
2. Weigh 10 g of sodium dodecyl sulfate.
3. Stir the solution until the reagent fully dissolves.
4. Dilute to the mark with deionized water. Mix fully.
5. Add the solution to the analyzer bottle. Insert the seal assembly and
put the cap on.
Prepare Reagent 3
Use standard laboratory protocols during preparation.
Items to collect:
• Ascorbic acid, fine granules, C
• Ethylenediaminetetraacetic acid disodium salt dihydrate,
Na EDTA·2H O, analytical quality, 0.66 g
2 2
• Formic acid, HCOOH, 88%, analytical quality, 14 mL
• Volumetric flask, 2 L
• Deionized water, 2 L
• Analyzer Bottle #R3
1. Add approximately half of the deionized water to the volumetric flask.
2. Weigh 200 g of ascorbic acid.
3. Add the ascorbic acid to the flask. Mix fully.
4. Weigh 0.66 g of Na EDTA·2H
2
5. Add the Na EDTA·2H O to the flask. Mix fully.
2 2
6. Measure 14 mL of formic acid.
7. Add the formic acid to the flask. Mix fully.
8. Dilute to the mark with deionized water. Mix fully.
9. Add the solution to the analyzer bottle. Insert the seal assembly and
put the cap on.
(CH ) SO Na, 10 g
2 11 4
H O , >99%, analytical quality, 200 g
6 8 6
O.
2