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有关岩石矿物中钒的测定方法共存元素的允许量较小,有的也不够灵敏。为此,本文着重研究了52种离子的可能影响,提出用CyDTA-氟化钠为掩蔽剂及在碱性介质中加入硫酸肼消除共存元素干扰,提高了方法的选择性。在0.5-0.6N硫酸介质中,过氧化氢存在下,钒与过氧化氢及2(3,5-二溴-2-吡啶偶氮)-5-二乙氨基苯酚(3,5-diBr-PADAP)形成橙红色的三元络合物。有色络合物至少可稳定24小时,其λ_max=605nm,ε_(605)=5.68×10~4,0.04-25微克五氧化二钒/毫升服从比尔定律。可用于测定岩石、土壤、铬铁矿及铝土矿中0.001-1.0％的钒。一、试剂配制钒标准溶液称取0.1000克光谱纯五氧化二钒,
The determination of vanadium in rock minerals allows for a small amount of coexisting elements and some are not sensitive enough. Therefore, this article focuses on the possible influence of 52 kinds of ions. It is proposed that the use of CyDTA-sodium fluoride as masking agent and the addition of hydrazine sulfate in alkaline medium to eliminate the interference of coexisting elements and improve the selectivity of the method. In the presence of hydrogen peroxide in 0.5-0.6 N sulfuric acid medium, vanadium and hydrogen peroxide and 2 (3,5-dibromo-2-pyridylazo) -5-diethylaminophenol PADAP) forms an orange-red ternary complex. The colored complex is stable for at least 24 hours with λ_max = 605 nm, ε_ (605) = 5.68 × 10 ~ 4, 0.04-25 μg vanadium pentoxide / ml subject to Beer’s law. It can be used to determine 0.001-1.0% vanadium in rock, soil, chromite and bauxite. First, the reagent preparation Vanadium standard solution Weigh 0.1000 grams of pure vanadium pentoxide,