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I have not been able to find any $\ce{SeO3^2-}$ identification reactions anywhere. Are there any?

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  • $\begingroup$ Can you be more specific? Classic German AC handbook Lehrbuch der analytischen und präparativen anorganischen Chemie by Jander and Blasius lists six different methods (ten if counting various reductants). Where are you determining selenate(IV) content, exactly? $\endgroup$ – andselisk Jan 7 at 13:05
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You can use reducing agents to reduce the $\ce{SeO3^2-}$ salt to elemental selenium. This paper1 discusses the use of iron(II) salts in acidic medium (phosphoric - hydrochloric acid) as reducing agent. The reaction proceeds at r.t.

You can use other reducing agents like hydrochloric acid, sulfur dioxide, hydroxylamine hydrochloride, hydrazine hydrochloride. The reduced selenium has a red color which turns greyish-warm on warming, but be careful on overheating (boiling or evaporating turns to serious losses of selenium by forming volatile $\ce{SeCl4}$).

References

  1. Rajkumar Kalaparthi , Srija Korapu , Padmarao Chekuri, 2020, New Spectrophotometric Determination of Sodium Selenate [Selenium (IV)] and Sodium Selenite[Selenium(VI)] with Iron(II), and Their Quantitative Analysis of Selenium (IV) – Selenium (VI) Present in A Binary Mixtures, INTERNATIONAL JOURNAL OF ENGINEERING RESEARCH & TECHNOLOGY (IJERT) Volume 09, Issue 05 (May 2020), DOI: 10.17577/IJERTV9IS050094
  2. Vogel, A. I., & Svehla, G. (1996). Vogel's qualitative inorganic analysis
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