How do I determine the alkalinity using the MACHEREY-NAGEL 915207 Visocolor HE Alkalinity AL 7 Test Kit? (MACHEREY-NAGEL 915207 Visocolor HE AL 7 Test Kit Instruction Guide)

Answer

manuals.plus

Feb 23, 2025 - 10:20 PM

To determine the alkalinity using the MACHEREY-NAGEL 915207 Visocolor HE Alkalinity AL 7 Test Kit, follow these steps:

1. Rinse the test tube several times with the test sample and fill it up to the ring mark.
2. Add 1 drop of the indicator m to the test sample and mix it by shaking. If the test sample turns red, the alkalinity is zero. If it turns blue, proceed to the next step.
3. Attach the dropping tip to the titration syringe and press down the plunger. Dip the tip into the titration solution TL AL 7 and slowly draw up the plunger until the lower rim of the black plunger O-ring is level with the value 0 on the barrel scale. The small air pocket below the plunger tip does not affect the determination.
4. Start adding the titration solution dropwise to the test tube while gently shaking it. Continue adding until the color of the test sample turns red. Read off the alkalinity value from the syringe barrel, specifically the lower rim of the black plunger O-ring.
5. If the first syringe filling is not sufficient to reach the color change (values > 7.2 mmol/L), refill the syringe with the titration solution TL AL 7 and repeat the titration process until the color change occurs. Add the additional used syringe contents.
6. The determined alkalinity value can be used for analysis, and the method can also be applied for the analysis of sea water.

Note: To differentiate the alkalinity of hydroxide, carbonate, and hydrogen carbonate, it is recommended to use the VISO COLOR® HE Carbonate Hardness C 20 (REF 915003) test kit.

For safety information and disposal instructions, please refer to the safety data sheet (SDS) provided by MACHEREY-NAGEL. The SDS can be downloaded from www.mn-net.com/SDS.