Water analysis is critical in numerous industries, from environmental monitoring to beverage production. For those requiring highly sensitive and precise measurements of water acidity, the MACHEREY-NAGEL Titrimetric test kit VISOCOLOR HE Acidity AC 7 (base capacity, CO₂) is an invaluable tool. This blog will explore the features and benefits of the reagent refill pack from Vendart, designed specifically for this titrimetric test kit.
The Reagent Refill Pack: Ensuring Consistent Accuracy
The reagent refill pack for the VISOCOLOR HE Acidity AC 7 test kit includes everything needed to perform up to 200 tests with an average acidity of 3 mmol/L HCl (CO₂). Here’s a breakdown of what you’ll find inside:
- 10 mL of Indicator p: A critical component that changes color to indicate acidity levels.
- 100 mL of Titration Solution TL AC 7: The primary reagent used in the titration process.
- 1 Test Tube with Ring Mark: Ensures precise measurement of the sample volume.
- 1 Titration Syringe (0 – 7 mmol/L HCl (CO₂)): Allows for accurate titration, with each graduation mark equivalent to 0.2 mmol/L.
- 2 Plastic Dropping Tips: Facilitate the careful addition of reagents.
It’s important to note that while the refill pack is comprehensive, it does not include the special titration syringe integral to the precision of the VISOCOLOR HE Acidity AC 7 test kit.
Using the VISOCOLOR HE Acidity AC 7 Test Kit
Accurate water analysis starts with correctly drawing your sample. Carbonic acid can easily escape from the test sample, so care must be taken to minimize this during sample collection:
Sample Collection: Fill the test tube slowly, minimizing liquid movement. Allow the sample to overflow for a few minutes before carefully emptying to the ring mark.
Preparation: Rinse the test tube several times with the test sample and fill to the ring mark.
Indicator Addition: Add 1 drop of indicator p and mix by shaking. If the sample turns red, acidity is zero; if colorless, proceed to titration.
Titration Procedure
Prepare the Syringe: Attach the dropping tip to the titration syringe, press the plunger down, dip the tip into the titration solution TL AC 7, and draw up the plunger until the lower rim of the black plunger O-ring is level with the 0 mark on the barrel scale.
Titration: Add the titration solution dropwise while gently shaking the test tube. When the sample turns red, read the acidity level from the syringe barrel and record the mmol/L HCl (CO₂).
Repeat if Necessary: If the first syringe filling is insufficient, refill the syringe and continue titration until the color change is achieved. Add the additional volume used to the initial value.
Safety and Disposal
The indicator p contains ethanol (55 – 75%), so handle it with care and refer to the safety data sheet for detailed precautions. After analysis, dispose of used specimens by flushing them down the drain with tap water, ensuring they are channeled to a local sewage treatment facility.
Advanced Applications and Considerations
The VISOCOLOR HE Acidity AC 7 test kit is not only suitable for general water analysis but also for seawater analysis. It’s important to note that the test kit measures all acids present in the sample, including humic acids and mineral acids. For precise results, repeat the test if the titration is performed too slowly, as carbonic acid may escape.
For further differentiation between carbonic and mineral acids, additional titration with the VISOCOLOR HE Carbonate Hardness C 20 kit is recommended.
The MACHEREY-NAGEL Titrimetric test kit VISOCOLOR HE Acidity AC 7, complemented by the reagent refill pack from Vendart, offers a highly sensitive and precise solution for water acidity analysis. By following the detailed procedures and handling instructions, you can ensure accurate and reliable results, making this kit an essential tool for water quality monitoring and analysis.
