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  2. Certificate of analysis - Wikipedia

    en.wikipedia.org/wiki/Certificate_of_analysis

    In the case of a produced chemical, drug, ingredient, or standard, the manufacturer will likely include a COA for the end user. In the case of a tested product/material/sample, the recipient of the COA will be the entity that ordered the analysis or mandated the test via regulation, as with cannabis testing.

  3. VWR International - Wikipedia

    en.wikipedia.org/wiki/VWR_International

    VWR acquired two other companies earlier in the year, EPL Archives and Seastar Chemicals [17] On May 5, 2017, it was announced that Avantor , a Center Valley, Pennsylvania-based supplier of ultra-high-purity materials to the life sciences and advanced technology industries, would acquire VWR for $33.25 in cash per share of VWR common stock ...

  4. N-(1-Naphthyl)ethylenediamine - Wikipedia

    en.wikipedia.org/wiki/N-(1-Naphthyl)ethylenediamine

    N-(1-Naphthyl)ethylenediamine dihydrochloride is widely used in the quantitative analysis of nitrate and nitrite in water samples by colorimetry.It readily undergoes a diazonium coupling reaction in the presence of nitrite to give a strongly colored azo compound.

  5. Certified reference materials - Wikipedia

    en.wikipedia.org/wiki/Certified_reference_materials

    A certified reference material is a particular form of measurement standard. Reference materials are particularly important for analytical chemistry and clinical analysis. [2] Since most analytical instrumentation is comparative, it requires a sample of known composition (reference material) for accurate calibration.

  6. Here Are All The Chemical-Free Sparkling Water Brands - AOL

    www.aol.com/chemical-free-sparkling-water-brands...

    Here Are All The Chemical-Free Sparkling Water Brands. Mackenzie Filson. July 28, 2023 at 8:42 AM. 9 Better-For-You Seltzer Brands Carlos Dominguez

  7. Sigma-Aldrich - Wikipedia

    en.wikipedia.org/wiki/Sigma-Aldrich

    Sigma Chemical Company of St. Louis and Aldrich Chemical Company of Milwaukee were both American specialty chemical companies when they merged in August 1975. The company grew throughout the 1980s and 1990s, with significant expansion in facilities, acquisitions and diversification into new market sectors.

  8. Avantor - Wikipedia

    en.wikipedia.org/wiki/Avantor

    Avantor, Inc. is an American biotechnology, chemicals, and pharmaceuticals company headquartered in Radnor, Pennsylvania.Established in 1904 as J.T. Baker, the company changed its name to Avantor in 2010.

  9. Calconcarboxylic acid - Wikipedia

    en.wikipedia.org/wiki/Calconcarboxylic_acid

    Calconcarboxylic acid (IUPAC name 3-hydroxy-4-[(2-hydroxy-4-sulfonaphthalen-1-yl)diazenyl]naphthalene-2-carboxylic acid; commonly called Patton and Reeder's Indicator) is an azo dye that is used as an indicator for complexometric titrations of calcium with ethylenediaminetetraacetic acid (EDTA) in the presence of magnesium. [2]