2-(2-咪唑偶氮)-5-二乙氨基酚与钒的显色反应及其应用

研究了新试剂 2 - (2 -咪唑偶氮 ) - 5-二乙氨基酚 (IZAPN)与V(Ⅴ )的显色反应 ,在pH 5的HAc NaAc介质中 ,V(Ⅴ )与IZAPN形成稳定的紫红色络合物 ,其组成比为nV∶nR=1∶2 ,最大吸收波长位于 575nm ,表观摩尔吸光系数为 2 96× 1 0 4 L·mol- 1 ·cm- 1 ,V(Ⅴ )在 0～ 0 8mg/L内服从比尔定律。在NaF和硫脲联合掩蔽下 ,方法可用于铝合金和合成废水中V(Ⅴ )的测定 ,加标回收率 1 0 0 0 %～ 1 0 0 5% ,RSD(n =6)≤ 2 0 %。     

湖北兴山白果园黑色页岩型银钒矿床中银钒赋存状态研究

湖北兴山白果园黑色页岩型银钒矿床以其独特的赋矿岩性受到国内外地质学家的重视,其Ａｇ,Ｖ的赋存状态也受到人们的关注。在前人工作的基础上,采用中子活化分析,电子探针分析和质子激发Ｘ射线发射分析等方法对黑色页岩中Ａｇ,Ｖ的赋存状态进行了分析。结果表明,Ａｇ的无机态和有机态各占一定的份额,其中无机态７６．６３％,有机态２３．２７％;无机态中以独立矿物态和类质同象态为主,独立矿物态占总量的２８．８５％,类质     

钻孔岩心红外光谱-便携式XRF-磁化率测试在攀西太和钒钛磁铁矿床勘查中的应用

近年来,红外光谱技术因其可以绿色、快速、无损、精确探测矿物和提高勘查效率而备受关注.攀西超大型太和钒钛磁铁矿床位于镁铁质-超镁铁质层状岩体中,该矿床的典型矿物的红外光谱特征研究相对缺乏,制约了勘查效率的提高.本文应用便携式傅里叶变换红外光谱仪对四川太和钒钛磁铁矿床钻孔ZK1307岩心开展热红外光谱测试工作,并辅以便携式...     

X射线荧光光谱法测定富含硫砷钒铁矿石中的主次量元素

以钴(钴玻璃粉形式)作内标元素,准确测定全铁含量;加入保护剂硝酸铵和稳定剂碳酸锂,使硫转化为硫酸盐,有效地防止硫的挥发损失。通过条件实验,确立了样品熔融温度和钴玻璃粉的用量。选择经筛选的仪器测定条件,用X射线荧光光谱法同时测定铁矿石中TFe、SiO2、CaO、MgO、Al2O3、TiO2、P、S、Mn、V2O5、As、K2O、Na2O、Cu、Ni等15种主次量元素。采用干扰曲线法对几乎完全重叠的TiΚβ谱线与VΚα谱线进行谱线重叠校正,用理论α系数法校正基体效应。建立的方法可以准确测定全铁和质量分数高达5.29%的S。采用多种标准物质和人工配制标准物质制作工作曲线,可以测定质量分数为5.00%的V2O5及0.1%的As,测定值与标准值符合较好,除低含量钠外方法精密度(RSD)<3.5%,分析误差符合实验质量要求。本法可以快速、准确地测定含砷的钒钛铁矿及含硫高的铁矿石中的主次量元素,满足了日常生产对铁矿石中硫和钒的测定要求。     

感耦等离子体发射光谱法测定原油中痕量铁镍铜钒

系统地试验了用感耦等离子体发射光谱同时测定原油中痕量元素Ｆｅ、Ｎｉ、Ｃｕ和Ｖ的多种前处理方法,制定出Ｈ２ＳＯ４、ＨＮＯ３分步炭化,５００℃灰化,ＨＣｌ＋ＨＮＯ３（ＶＨＣｌ∶ＶＨＮＯ３＝１∶１）溶解灰分的最佳分解方案。该方法的检出限为１．０～６．０μｇ／Ｌ,精密度好,ＲＳＤ（ｎ＝４）＜４．６％,加标回收率为９６．２％～１１１％。方法已应用于大庆、苏北、惠州等原油样品的分析。     

湖南古丈县双溪钒矿床地质特征及成矿机制初探

湖南双溪钒矿床产于寒武系下统木昌组,赋矿岩层为一套富含有机质的硅、磷、碳组合的黑色岩系.钒矿（V₂O₅）的品位为0.61%~1.51%,矿石主要分为3种类型：黑色碳硅质岩-页岩型、含磷结核页岩型及页岩型.钒的赋存状态主要有吸附态和类质同象态.通过对成岩、成矿的研究,初步认为双溪钒矿为海底喷气热水溶液同生沉积生成.     

遵义含钒石煤提取粉状V2O5试验探索

遵义县松林镇小竹流水寒武系下统牛蹄塘组含钒石煤,利用“离子交换取五氧化二钒”新工艺进行试验性探索,能够获得符合GB3283-87要求的98级五氧化二钒产品,金属总回收率近65%。     

Dissolved uranium, vanadium and molybdenum behaviours during contrasting freshwater discharges in the Gironde Estuary (SW France)

Understanding trace metal behaviour in estuarine environments requires sampling strategies and analytical methods adapted to strong physical and geochemical gradients. In this study, we present a specific sampling strategy covering a wide range of hydrological conditions during nine cruises in 2003–2007 to characterise the behaviour of three dissolved metals (uranium, vanadium and molybdenum) in surface and bottom water along the salinity gradient of the highly turbid macrotidal Gironde Estuary using a solid–liquid extraction. Uranium behaved conservatively whatever the water discharges observed. The slight dissolved U depletion compared to the theoretical dilution line between the fluvial and marine end-members occasionally observed in the low salinity range (0–3) was attributed to the mixing of different water bodies of the Gironde tributaries. In contrast, dissolved V behaviour was largely influenced by the hydrological conditions, showing increasingly pronounced addition with decreasing freshwater discharges, (i.e. increasing residence times of water and particles in the estuary). This addition of dissolved V in the low- to mid-salinity range was attributed to desorption processes observed in the Maximum Turbidity Zone (MTZ). The distribution of dissolved Mo concentrations along the salinity gradient was highly variable. Apparent conservative, and non-conservative behaviours were observed and were related to the concomitance of desorption from SPM, inputs from sediments for additive distribution and biological uptake and removal into sediments for subtractive distribution. Based on the whole database (2003–2007), annual net fluxes to the coastal ocean were estimated for dissolved U (15.5–16.6 t yr⁻¹) and V (31.3–36.7 t yr⁻¹).     

黔东下寒武统黑色岩系钒矿床

扬子地台周边的下寒武统黑色岩系蕴藏着丰富的金属矿产资源。文章探讨了黔东地区下寒武统黑色岩系中的钒矿床地质特征及成矿问题。钒矿床受地层的控制,钒等金属元素致矿是多种条件产物,其成矿高峰期为热水沉积与正常沉积交替期,矿石的成矿年龄为(521±54)～(542±11)Ma;矿床类型为沉积型矿床。