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对含钒物料中全铁的测定,一直采用强碱分离以消除钒的影响,再用经典的二氯化锡还原-氯化高汞氧化-重铬酸钾滴定的分析方法。本文利用亚硫酸钠还原-重铬酸钾滴定的分析方法进行含钒物料中全铁的测定。亚硫酸钠还原三价铁的同时,五价钒还原为四价,由于V~(5+)/V~(4+)与Cr~(6+)/Cr~(3+)的电极电位接近,因此V~(4+)不被重铬酸钾滴定,从而消除了钒的干扰。一主要试剂混合熔剂:两份无水碳酸钠与1份硼酸混匀,于180℃烘干研细备用。重铬酸钾标准溶液;0.0042M,0.0083M,准确称取已在105～110℃烘干的基准重铬酸钾2.4515g。
Determination of total iron in vanadium-containing materials, has been the use of strong base separation to eliminate the impact of vanadium, then the classic tin dichloride reduction - high chloride oxidation of chloride - potassium dichromate titration analysis. In this paper, sodium sulfite reduction - potassium dichromate titration method for determination of total iron in vanadium-containing materials. At the same time that sodium sulfite reduces ferric iron, pentavalent vanadium is reduced to tetravalent. Because the potential of V ~ (5 +) / V ~ (4+) is close to that of Cr ~ (6 +) / Cr ~ (3+) V ~ (4 +) is not titrated by potassium dichromate, thus eliminating the interference of vanadium. A main reagent mixed flux: two parts of anhydrous sodium carbonate and 1 boric acid mixing, drying at 180 ℃ fine grinding. Potassium dichromate standard solution; 0.0042M, 0.0083M, Accurately weigh the reference potassium dichromate 2.4515g that has been dried at 105 ~ 110 ℃.