光度法联合测定锰矿中的铬和钒

采用过氧化钠-碳酸钠熔融锰矿，热水浸取，经过滤后，于同一种母液中分别移取适当滤液，在酸性介质中，用光度法连续测定铬和钒的含量。试验选定硫酸（1＋1）用量为2 mL，磷酸（1＋1）3 mL，稳定时间分别是10 min及30 min，该方法操作过程简单，测定值与标准值相符，RSD（n=8）Cr≤4.98%，V≤4.87%，而且不易受锰矿中其他成分对测定结果的影响。

C ombined D etermination of C hromium and V anadium in M anganese O re by P hotometry

The manganese ore was melted by sodium dioxide- sodium carbonate, extracted with hot water and filtered. A part of the filtrate from the same kind of mother liquor was taken into a volumetric flask. In the acidic medium, the contents of Cr and V were determined by photometry. Sulfuric acid （1＋1） content selected by test is 2 mL, the phosphoric acid is 3 mL and the stable times are 10 min for Cr and 30 min for V. This method is simple for operator, the value of determination is accordant with the value of standard, the RSD （n=8）≤4.98%for Cr and≤4.87%for V and the result of determination is not affected by other components in manganese ore.