If this product has an expiration or retest date, it will be shown on the Certificate of Analysis (COA, CofA). If there is no retest or expiration date listed on the product's COA, we do not have suitable stability data to determine a shelf life. For these products, the only date on the COA will be the release date; a retest, expiration, or use-by-date will not be displayed.
For all products, we recommend handling per defined conditions as printed in our product literature and website product descriptions. We recommend that products should be routinely inspected by customers to ensure they perform as expected.
For products without retest or expiration dates, our standard warranty of 1 year from the date of shipment is applicable.
For more information, please refer to the Product Dating Information document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/418/501/product-dating-information-06-25-mk.pdf
1.88054
Étalon d′eau pour méthode avec four à 1 %
Certified Reference Material for KF oven method Aquastar®
Synonyme(s) :
Étalon d’eau, four, 1 % pour la méthode du four de KF TM=["AQUASTAR"]
Sélectionner une taille de conditionnement
164,00 €
A propos de cet article
Passer à
grade
certified reference material
agency
ISO 17025, 17034
product line
Aquastar®
form
solid
reaction suitability
reaction type: water standard for Karl Fischer titration
packaging
glass bottle of 5 g
technique(s)
Karl-Fischer titration: suitable
bulk density
460 kg/m3
format
neat
storage temp.
15-25°C
Quality Level
1 of 4
Cet article | 1.88050 | 1.88051 | 1.88052 |
|---|---|---|---|
| grade certified reference material | grade reference material | grade certified reference material | grade certified reference material |
| agency ISO 17025, 17034 | agency ISO 17025 | agency ISO 17025, 17034 | agency ISO (17025, 17034) |
| format neat | format single component solution | format single component solution | format single component solution |
| product line Aquastar® | product line Aquastar® | product line Aquastar® | product line Aquastar® |
| form solid | form liquid | form liquid | form liquid |
| technique(s) Karl-Fischer titration: suitable | technique(s) Karl-Fischer titration: suitable | technique(s) Karl-Fischer titration: suitable | technique(s) Karl-Fischer titration: suitable |
Application
Features and Benefits
- Conditionnement pratique en flacons de verre soumis à des études de stabilité et d'homogénéité conformément à la norme ISO 17034 et au Guide 35 de l'ISO
- Certificat d'analyse détaillé du lot précisant la teneur en eau exacte mesurée, l'incertitude de mesure, la technique d'analyse, le protocole de mesure et la durée de conservation minimale
- Produit caractérisé dans un laboratoire d'étalonnage accrédité ISO/CEI 17025 et ISO 17034
- Traçabilité métrologique directe au kilogramme (unité SI)
General description
Téléchargez votre certificat sur le site http://www.sigma-aldrich.com pour visualiser les valeurs certifiées, y compris l'incertitude et la date d'expiration.
Other Notes
Legal Information
Related product
Classe de stockage
13 - Non Combustible Solids
flash_point_f
Not applicable
flash_point_c
Not applicable
Certificats d'analyse (COA)
Recherchez un Certificats d'analyse (COA) en saisissant le numéro de lot du produit. Les numéros de lot figurent sur l'étiquette du produit après les mots "Lot" ou "Batch".
Déjà en possession de ce produit ?
Retrouvez la documentation relative aux produits que vous avez récemment achetés dans la Bibliothèque de documents.
Articles
Methods including internal extraction, external extraction, and Karl Fischer oven ensure accurate water content determination by titration.
New Aquastar® Karl Fischer Anolyte for precise and reproducible determination of low water content in the range of 10 ppm to 10000 ppm for cells without a diaphragm.
Protocoles
Karl Fischer titration offers accurate water content determination in hemp samples compared to the loss on drying method.
Foodstuffs often provide a challenge for the water determination by Karl-Fischer. Instant Coffee is such a sample matrix and its water content has influence on quality and shelf life.
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How can I determine the shelf life / expiration / retest date of this product?
1 réponse-
Utile ?
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How is shipping temperature determined? And how is it related to the product storage temperature?
1 réponse-
Products may be shipped at a different temperature than the recommended long-term storage temperature. If the product quality is sensitive to short-term exposure to conditions other than the recommended long-term storage, it will be shipped on wet or dry-ice. If the product quality is NOT affected by short-term exposure to conditions other than the recommended long-term storage, it will be shipped at ambient temperature. As shipping routes are configured for minimum transit times, shipping at ambient temperature helps control shipping costs for our customers. For more information, please refer to the Storage and Transport Conditions document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/316/622/storage-transport-conditions-mk.pdf
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What should be done if Water Standard Oven 1% experiences a decrease in water content when stored under argon in a glove box?
1 réponse-
It is not recommended to store the 1% water standard oven in a glove box. Storing it in environments with low humidity can cause a decrease in its water content. To maintain the standard's integrity, it is crucial to tightly seal the bottles immediately after use and store them under normal laboratory or environmental conditions.
Utile ?
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buenos dias, a que temperatura esta certificado este std ?
1 réponse-
As cited in the product Certificate of Analysis, the water content is determined by the coulometric Karl Fischer oven method at 170°C".
TS Answer: Product 1.88054 (which may also be written without the dot as 188054) is a water standard composed of a mixture of potassium sulfate and sodium tungsten dihydrate, provided as a powder. It is approximately 1 percent water by weight or 10 milligrams of water per 1 gram of powder; the exact certified value as a mass fraction or mass percentage is reported on the certificate of analysis (CofA) for each lot.
This standard is to be stored at room temperature (15-25°C), up to the lot-specific expiry date. But the analysis is run at a much higher temperature. The Measurement method provided on the Certificate of Analysis says "The water content is determined by coulometric Karl Fischer oven method at 170°C".
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