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Article ID: CBB001201039

The Emerging Role of Titrimetry in Late Nineteenth-Century Industrial Problem Solving: The Example of Trace Analysis for Perchlorate in Chile Saltpetre (2014)

Travis, Anthony S. (Author)

Ambix: Journal of the Society for the History of Alchemy and Chemistry
Volume: 61, no. 1
Issue: 1
Pages: 67-94

DOI: 10.1179/0002698013Z.00000000044

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Chemistry Science and industry Agricultural chemistry Chemical analysis; Trace analysis Saltpeter Agriculture Titrimetry 19th century Chile

Trace analysis is usually associated with high-sensitivity analysis instrumentation. It became fully established from the 1960s following consensus among different groups of practitioners over protocols, reference materials, sensitivity, and accuracy and precision. As a consequence, wet chemical methods have been relegated to a secondary role, contrasting with their tremendous historical significance in detecting, identifying, and estimating small amounts of material. This is particularly relevant to the state-of-the-science analytical determinations stimulated by the effect of minor components in commodities of commercial importance. Here, I select a single example: attempts made during the 1890s to determine the amount of potassium perchlorate (KClO4) that occurs in Chile saltpetre (sodium nitrate). The application of titrimetry, particularly the adaptation of Volhard's method for chloride analysis, was crucial in the efforts to estimate perchlorate in the nitrate used for explosives and to track the impact of perchlorate concentrations on certain important agricultural crops

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