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亚铁容量法测定矿石中铈是常用方法,鉴于该法存在分析结果易产生系统偏差,还原锰需使用毒性试剂亚砷酸钠,不适于含钒试样的测定等问题。本文采用一元线性回归法求亚铁标准溶液的滴定度和修正因数;以亚硝酸钠消除锰的干扰;用酒石酸钾钠分离钒,克服了原方法的缺点。主要试剂亚铁灵指示剂-1.5克1.10-邻菲罗啉溶于100毫升1.0％硫酸亚铁铵溶液中;0.2％邻苯氨基苯甲酸指示剂;铈标准溶液-取0.6142克光谱纯二氧化铈预先在850℃灼烧半小时,按不含钒试样分解,用1.5％(V/V)硫酸稀至500毫升,此溶液1毫升含1毫克铈;0.007N硫酸亚铁铵标准溶液[内含4％(V/V)硫酸]。亚铁标准溶液的标定于6个250毫升锥形瓶中分
Ferrous volumetric method for the determination of cerium in ore is a common method, in view of the existence of the results of the analysis of the law prone to systematic bias, reduction of manganese need to use toxic reagent sodium arsenite is not suitable for the determination of vanadium-containing samples and other issues. In this paper, a univariate linear regression method was used to determine the titer and correction factor of ferrous standard solution. The interference of manganese with sodium nitrite was eliminated. The separation of vanadium from potassium sodium tartrate overcomes the shortcomings of the original method. The main reagent ferrous spirit indicator -1.5 grams 1.10-o-phenanthroline dissolved in 100 ml of 1.0% ammonium ferrous sulfate solution; 0.2% orthoanilin benzoic acid indicator; cerium standard solution - take 0.6142 g Spectra of pure ceria in advance After burning at 850 ℃ for half an hour, according to the vanadium-free sample decomposition, diluted with 1.5% (V / V) sulfuric acid to 500 ml, 1 ml of this solution contains 1 mg of cerium; 0.007N ferrous ammonium sulfate standard solution [ 4% (V / V) sulfuric acid]. Ferrous standard solution calibration in 6 250 ml Erlenmeyer flask points