1Key Takeaways
Nitric acid is used to precipitate iron as hydroxide by adding potassium permanganate and ammonium hydroxide. The precipitate is dissolved with hydrochloric acid, and the iron content is determined colorimetrically using potassium dichromate. Alternatively, o-phenanthroline can be used instead of potassium dichromate, …
2Scope / Description
Nitric acid is used to precipitate iron as hydroxide by adding potassium permanganate and ammonium hydroxide. The precipitate is dissolved with hydrochloric acid, and the iron content is determined colorimetrically using potassium dichromate. Alternatively, o-phenanthroline can be used instead of potassium dichromate, providing a more sensitive coloration that allows for the determination of very low iron contents. Procedures: Determination using potassium dichromate. Determination using o-phenanthroline.
6Frequently Asked Questions
What is UNI 4773:1961?
UNI 4773:1961 — Procedures for chemical analysis of metals. Determination of iron in cadmium. Colorimetric method. is an international standard developed by Ente Nazionale Italiano di Unificazione. Nitric acid is used to precipitate iron as hydroxide by adding potassium permanganate and ammonium hydroxide. The precipitate is dissolved with hydrochloric acid, and the iron content is determined colorimetrically using potassium dichromate....
What does UNI 4773:1961 cover?
This standard covers: Nitric acid is used to precipitate iron as hydroxide by adding potassium permanganate and ammonium hydroxide. The precipitate is dissolved with hydrochloric acid, and the iron content is determined colorimetrically using potassium dichromate. Alternatively, o-phenanthroline can be used instead of...
Who should use this standard?
This standard is intended for organizations, professionals, and stakeholders involved in various industries and sectors. It is applicable to manufacturers, service providers, regulatory bodies, and certification organizations.
What is the latest version of UNI 4773:1961?
The current published version is UNI 4773:1961, published on 1961-07-31. Always check for amendments or pending revisions.
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