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室温下，硫酸介质中，利用铬（ Ⅳ）氧化橙黄 Ｇ使其褪色，建立了测定痕量铬（Ⅳ）的新方法．并讨论了反应机理．线性范围为０～３ ｍｇ／Ｌ，检出限为０．０４ｍｇ／Ｌ．
At room temperature, a new method was established for the determination of trace chromium (Ⅳ) in sulfuric acid medium using chromium (Ⅳ) oxide yellow G to make it fade. The reaction mechanism was discussed. The linear range was 0-3 mg / L with the detection limit of 0.04 mg / L.