Abstract: A method for the determination of ferrous in chromite ores was developed. Based on the verification and screening tests for the original methods in literatures and studying on the dissolution-assistant effect of Li₂SO₄ (as a hydrotropy agent) and its reaction mechanism, two dissolution systems of H₂SO₄-H₃PO₄-V₂O₅-V₂O₅-Li₂SO₄ and H₂SO₄-H₃PO₄-Ce(SO₄)₂-Li₂SO₄ were introduced. The improved methods have been applied to the determination ferrous in chromite samples with satisfactory results.