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
추천 제품
제품명
Water Standard Oven 1%, Certified Reference Material for KF oven method Aquastar®
Grade
certified reference material
Quality Level
Agency
ISO 17025, 17034
제품 라인
Aquastar®
양식
solid
포장
glass bottle of 5 g
기술
Karl-Fischer titration: suitable
벌크 밀도
460 kg/m3
형식
neat
저장 온도
15-25°C
일반 설명
Download your certificate at http://www.sigma-aldrich.com to view certified values, including uncertainty and expiry date.
애플리케이션
특징 및 장점
- Packed in convenient glass bottles with the material subjected to stability and homogeneity studies following ISO 17034 and ISO Guide 35
- Supplied with a batch-specific certificate of analysis (CoA) having data on exact measured water, uncertainty, method of analysis, measuring method, and minimum shelf life
- Characterized in an ISO/IEC 17025 and ISO 17034 accredited calibration laboratory
- Directly traceable to SI unit (kg)
결합
법적 정보
시약
Storage Class Code
13 - Non Combustible Solids
WGK
WGK 2
Flash Point (°F)
Not applicable
Flash Point (°C)
Not applicable
시험 성적서(COA)
제품의 로트/배치 번호를 입력하여 시험 성적서(COA)을 검색하십시오. 로트 및 배치 번호는 제품 라벨에 있는 ‘로트’ 또는 ‘배치’라는 용어 뒤에서 찾을 수 있습니다.
이미 열람한 고객
문서
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.
프로토콜
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?
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도움이 되었습니까?
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How is shipping temperature determined? And how is it related to the product storage temperature?
1 답변-
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
도움이 되었습니까?
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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 답변-
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.
도움이 되었습니까?
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buenos dias, a que temperatura esta certificado este std ?
1 답변-
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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