Both cover total, primary, secondary, and tertiary amine values of fatty amines. The key difference is in the titration technique: D2074 used an "alternative indicator method," whereas D2073 is the "referee test method" that typically uses a potentiometric (pH‑meter) titration. D2073 is generally considered more precise and is the current active standard.
To help me tailor any further analysis, could you share a few more details?
To perform this test, it is necessary to use the officially published standard. The document can be acquired through official channels: astm d2074 pdf
The active version is ASTM D2074-07(2019) , which was originally approved in 1962 and most recently reapproved in 2019.
(typically bromocresol green or methyl orange) to identify the endpoint of the titration with an acid, such as hydrochloric acid ( cap H cap C l Amine Differentiation Total Amine Value : Measures all basic amino groups present. Primary, Secondary, and Tertiary Both cover total, primary, secondary, and tertiary amine
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The test focuses on measuring the "amine value," which is defined as the number of milligrams of potassium hydroxide (KOH) equivalent to the amine basicity in one gram of the sample. Why the "Alternative" Indicator Method? To help me tailor any further analysis, could
A separate sample is treated with salicylaldehyde, which reacts with primary amines. The mixture is then titrated, measuring the leftover basicity from secondary and tertiary amines only.
By understanding the history, scope, and limitations of ASTM D2074, you can make an informed decision about whether to continue using it or transition to a newer alternative.