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/449/386/product-dating-information-mk.pdf
1.88054
Water Standard
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
243,00 $
Sélectionner une taille de conditionnement
About This Item
243,00 $
Produits recommandés
Nom du produit
Étalon d′eau pour méthode avec four à 1 %, Certified Reference Material for KF oven method Aquastar®
Qualité
certified reference material
Niveau de qualité
Agence
ISO 17025, 17034
Gamme de produits
Aquastar®
Forme
solid
Technique(s)
Karl-Fischer titration: suitable
titration: suitable
Masse volumique apparente
460 kg/m3
Format
neat
Température de stockage
15-25°C
Description générale
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.
Application
Caractéristiques et avantages
- 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)
Liaison
Informations légales
Réactif
Code de la classe de stockage
13 - Non Combustible Solids
Classe de danger pour l'eau (WGK)
WGK 2
Point d'éclair (°F)
Not applicable
Point d'éclair (°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".
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Retrouvez la documentation relative aux produits que vous avez récemment achetés dans la Bibliothèque de documents.
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Articles
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.
Methods including internal extraction, external extraction, and Karl Fischer oven ensure accurate water content determination by titration.
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 answer-
Helpful?
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How is shipping temperature determined? And how is it related to the product storage temperature?
1 answer-
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
Helpful?
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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 answer-
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.
Helpful?
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buenos dias, a que temperatura esta certificado este std ?
1 answer-
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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