= standard solution
{c}
Entry in <IUPAC Compendium of Chemical Terminology, fifth edition (Gold Book) by International Union of Pure and Applied Chemistry>, issued by <International Union of Pure and Applied Chemistry>. No individual entry author is established. The official citation identifies online version 5.0.0, 2025; this is a compendium version date. The entry cites the Orange Book, second edition, p. 48 as its underlying source.
Online text: https://goldbook.iupac.org/terms/view/S05924/1000
Metadata verification: https://goldbook.iupac.org/terms/view/S05924/plain[Official indexed entry and citation; direct request unavailable]
Cited passages: Definition paragraphs: primary standard, secondary standard solution; underlying source Orange Book, second edition, p. 48.
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