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
1.18469
Kjeldahl tablets
(Missouri catalyst) 3.5g/tablet
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About This Item
Quality Segment
form
tablet
specific analyte(s)
nitrogen
technique(s)
photometry: suitable
pH
6.1 (20 °C, 100 g/L in H2O)
solubility
100 g/L
application(s)
cannabis testing
storage temp.
no temp limit
Application
- Health risk assessment of arsenic in Realgar and NiuHuangJieDu Tablets based on pharmacokinetic study: This research utilizes Kjeldahl tablets to determine the nitrogen content in pharmaceutical compounds, specifically assessing the health risks associated with arsenic levels in traditional Chinese medicine. This study underlines the critical application of Kjeldahl analysis in ensuring the safety and efficacy of pharmaceutical products (Wu et al., 2018).
- Application of infrared spectroscopy technique to protein content fast measurement in milk powder based on support vector machines: This study illustrates the use of Kjeldahl tablets for rapid protein quantification in milk powder, employing infrared spectroscopy enhanced by machine learning algorithms. The research highlights the effectiveness of Kjeldahl nitrogen analysis in food science, ensuring quality control and nutritional assessment in dairy products (Wu et al., 2008).
Analysis Note
Application test: passes test
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Hazard Codes
Precautionary Statements
Hazard Classifications
Aquatic Chronic 3
Storage Class
13 - Non Combustible Solids
WGK
WGK 3
Flash Point (°F)
Not applicable
Flash Point (°C)
Not applicable
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How can I determine the shelf life / expiration / retest date of this product?
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How is shipping temperature determined? And how is it related to the product storage temperature?
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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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For a school project we need to know how much Na2SO4 and CuSO4 there is in 1 Kjeldahl Tablet. Is it possible to get this information?
1 answer-
The composition of the tablet is 48.8 % Na2SO4; 48.9 % K2SO4; and 0.3 % CuSO4.
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