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
Horno estándar de agua 1 %
Certified Reference Material for KF oven method Aquastar®
Sinónimos:
Patrón de agua para horno al 1 % TM=["AQUASTAR"] para el método de horno KF
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161,00 €
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About This Item
161,00 €
Productos recomendados
grado
certified reference material
Nivel de calidad
Agency
ISO 17025, 17034
Línea del producto
Aquastar®
Formulario
solid
envase
glass bottle of 5 g
técnicas
Karl-Fischer titration: suitable
densidad aparente
460 kg/m3
Formato
neat
temp. de almacenamiento
15-25°C
Descripción general
Descargue su certificado en http://www.sigma-aldrich.com para ver los valores certificados, entre ellos la incertidumbre y la fecha de caducidad.
Aplicación
Características y beneficios
- Envasada en cómodas botellas de vidrio con el material sometido a estudios de estabilidad y homogeneidad según la ISO 17034 y la Guía ISO 35
- Se suministra con un certificado de análisis (CoA) específico de lote que contiene datos sobre el agua medida exacta, la incertidumbre, el método de análisis, el método de medición y la vida útil mínima
- Caracterizada en un laboratorio de calibración acreditado por la ISO/IEC 17025 y la ISO 17034
- Directamente compatible con las unidades del SI (kg)
Ligadura / enlace
Información legal
reactivo
Código de clase de almacenamiento
13 - Non Combustible Solids
Clase de riesgo para el agua (WGK)
WGK 2
Punto de inflamabilidad (°F)
Not applicable
Punto de inflamabilidad (°C)
Not applicable
Certificados de análisis (COA)
Busque Certificados de análisis (COA) introduciendo el número de lote del producto. Los números de lote se encuentran en la etiqueta del producto después de las palabras «Lot» o «Batch»
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Artículos
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.
Protocolos
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 respuesta-
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How is shipping temperature determined? And how is it related to the product storage temperature?
1 respuesta-
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 respuesta-
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.
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buenos dias, a que temperatura esta certificado este std ?
1 respuesta-
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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