Storing Tsk Standards; Using; Preparing And Using Standards - Infrequent Use; Preparing And Using Standards - Frequent Use - VWR TIR 200 Manual De Instrucciones

For optimum results when using TSK standards, adhere to the following recom-
mendations:

Storing TSK standards

• TSK standards should always be stored in their original vial.
• Preferably store the vials upright.
• Store standards between 5 and 25°C.
• Avoid prolonged exposure to temperatures exceeding 35°C.
• Store away from direct sunlight.
• Always allow the standards to acclimatise to ambient instrument temperature before use
(not to exceed 35°C).
• TSK standards have a shelf life of 12 months if stored correctly.
Using < 0.1 NTU standards
Caution: Never shake or invert this < 0.1 NTU standard.
• After delivery allow the vial to stand for at least 24 hours before use.
• If the standard has been shaken it can take several hours for all the bubbles to dissipate
and we suggest the vial is left for at least 24 hours as outlined above.
• If the standard has been inverted accidentally wait at least 15 minutes before using.
Preparing and using standards – infrequent use
Note: These instructions apply to all standards except the < 0.1 NTU standard. If you are
using the < 0.1 NTU standard follow the instructions given above.These instructions apply to
standards that have been sitting undisturbed for more than one week or to new standards.
1. Shake the standard vigorously for 2 – 3 minutes.
2. Let the vial stand undisturbed for 5 minutes.
3. Invert the vial between 5–10 times.
4. Immediately place the vial in the sample chamber and wait for 1 minute (countdown).
Preparing and using standards – frequent use
Note: These instructions apply to all standards except the < 0.1 NTU standard. If you are
using the < 0.1 NTU standard follow the instructions given above.These instructions apply to
frequently used standards (daily or weekly usage).
1. Invert the vial 10 times.
2. Immediately place the vial in the sample chamber and wait for 1 minute (countdown).

Preparation of dilution water

Obtain at least 1000 ml of high quality water (e.g. distilled, demineralised or deionised wa-
ter). Check the turbidity of the dilution water before use. If the turbidity is greater than 0.5
NTU (FNU) the water should be filtered with membrane filter (0.1 µm). Clean the required
glassware with 1:1 hydrochloric (37%) acid and rinse several times with the dilution water.
20252.290
16
Hydrochloric acid (37%)
VWR ver 1 01/2018