化学发光体系测定铋的研究及其应用

研究了痕量Bi催化鲁米诺-邻菲啰啉-H_2O_2-Triton x-305体系产生化学发光及非离子表面活性剂敏化化学发光最佳反应条件,拟定了新的化学发光测定Bi的方法。方法最低检出限达3.7×10~(-10)g/ml,测定响应浓度范围为5×10~(-9)～10~(-5)g/ml,回收率为98.7％～103％,相对标准偏差为2.8％～3.5％之间。     

鲁山关停141个非法铁矿点

自2004年12月20日开始，鲁山县对境内铁资源开采加工秩序进行了近20天的专项整治，共关停铁资源采矿场(点)、选矿场(点)141个，沉重打击了非法开采加工铁资源的嚣张气焰，有效遏制了乱采滥挖、非法加工铁资源的势头，使铁资源开采加工秩序的混乱局面得到有效控制。     

基于遥感蚀变信息提取巴林格撞击坑周边铁陨石

目前地球上已经得到确认的撞击坑有190余个，其中直径小于1 km的简单撞击坑绝大部分是由铁质撞击体撞击形成的。由铁质撞击体撞击而成的撞击坑周边存在大量的铁陨石物质，这些铁陨石物质的空间分布特征对研究撞击坑的撞击过程和机理具有重要意义。铁元素的异常富集也可作为探寻地球表面疑似撞击坑的重要信息。为了获取撞击坑周围的铁陨石残片，早期主要通过人工方式进行实地调查，但这种方法效率低下且需要投入大量人力物力。基于铁陨石独特的光谱特征，利用遥感蚀变信息提取手段可以很方便地获取撞击坑周边的铁陨石物质。根据铁陨石矿物的波谱特征，以美国亚利桑那州巴林格撞击坑（Barringer Meteor Crater）为研究对象，基于Landsat 8 OLI数据，采用目前提取蚀变信息的常用方法:波段比值（BandMath）—主成分分析法进行撞击坑周边铁陨石信息的提取。提取结果与前人实地调查获取的铁陨石分布情况契合程度较好。撞击坑东侧、东南侧、西南侧等处的铁陨石聚集区在提取结果图上均有较好的反映。表明利用波段比值-主成分分析方法提取巴林格撞击坑周边铁陨石信息是可行的，实验结果准确地获得了该撞击坑周围的铁陨石空间分布信息，为探寻地球表面撞击成因的环形构造提供了可行方案，同时为未来同类撞击坑信息提取提供了重要的方法参考。      

化学发光测定痕量钒的研究及其应用

本文研究了鲁米诺－高碘酸钾－钒体系产生化学发光反应，建立了测定痕量钒新的化学发光法。在ＥＤＴＡ为活化剂存在下，方法的检出限为３×１９（－９）ｇ／ｍｌ，工作曲线响应浓度范围为１×１０（－８）～１×１０（－６）ｇ／ｍｌ，测定５×１０（－７）ｇ／ｍｌ钒的相对标准偏差为２．５％～３．０％之间。该法有很好的选择性，用于测定岩矿等物料中痕量钒可获得满意结果。     

汶上东平沉积变质型铁矿床磁性铁品位回归模型

汶上-东平地区沉积变质型铁矿床磁性铁品位与可溶铁品位呈线性关系,相关系数0.965,经筛选,选取了2 030组样品建立了汶上-东平带沉积变质型磁铁矿品位与可溶铁的一元回归方程,经过与样品测试的分析结果对比,证明一元回归方程具有代表性、客观性。     

福建大田地区铁、硫多金属矿床地质特征与找矿标志

文章对福建大田地区铁、硫多金属矿床的地质特征进行了论述,认为该矿床具有矽卡岩型矿床的地质特征,并提出该区铁、硫多金属矿床的找矿标志。     

朝阳：喀左县国土局积极主动为企业用地办理手续

随着学习实践科学发展观活动的不断深入，喀左县国土资源局以“保增长、促发展”为目标，积极主动地为铁选矿企业提供服务。于近日召开了铁选矿企业家座谈会，副县长陈峻峰在会上讲话，县国土局就为企业办理临时用地手续，需提供要件进行了详细耐心细致地解答，并集体征询企业意见。对于探矿、采矿手续并不完全具备的铁选矿企业采取“边开工、边补办”的原则开展工作。     

激电偶极、高密度电法寻找层控型铁锰铅锌矿床的应用

文章介绍激电偶极、高密度电法在广西寻找层控型铁锰铅锌矿床上的应用.该法在层控型铁锰铅锌矿上圈出了异常,特别是高密度电法的映像,清晰再现了异常体的重向分布,因此认为该法是寻找层控型铁锰铅锌矿一种行之有效的方法.     

激电偶极、高密度电法寻找县控型铁锰铅锌矿床的应用

文章介绍激电偶极、高密度电法在广西寻找层控型铁锰铅锌矿床上的应用。该法在层控型铁锰铅锌矿上圈出了异常，特别是高密度电法的映像，清晰再现了异常体的重向分布，因此认为该法是寻找层控型铁锰铅锌矿一种行之有效的方法。     

海底铁锰矿床类型特征及成矿作用

海底铁锰矿床主要有铁锰结壳、铁锰结核和层状、透镜状铁锰矿床，其成矿作用主要是水成成矿作用，成岩成矿作用和热液成矿作用。水成成因的结壳富Ｃｏ、贫Ｃｕ，ＲＥＥ含量高，Ｃｅ正异常明显，且富含δ－ＭｎＯ２。成岩成因的结核富Ｎｉ、Ｃｕ，ＲＥＥ含量低，Ｃｅ正异常减弱，含钡镁锰矿．热液成因的铁锰矿床Ｍｎ、Ｆｅ分异好，微量过渡金属和ＲＥＥ含量最低，见Ｃｅ的负异常和Ｅｕ的正异常．     

Simultaneous determination of iron and manganese in water using artificial neural network catalytic spectrophotometric method

A new analytical method using Back-Propagation (BP) artificial neural network and kinetic spectrophotometry for simultaneous determination of iron and magnesium in tap water, the Yellow River water and seawater is established. By conditional experiments, the optimum analytical conditions and parameters are obtained. Levenberg-Marquart (L-M) algorithm is used for calculation in BP neural network. The topological structure of three-layer BP ANN network architecture is chosen as 15-16-2 (nodes). The initial value of gradient coefficient μ is fixed at 0.001 and the increase factor and reduction factor of μ take the default values of the system. The data are processed by computers with our own programs written in MATLAB 7.0. The relative standard deviation of the calculated results for iron and manganese is 2.30% and 2.67% respectively. The results of standard addition method show that for the tap water, the recoveries of iron and manganese are in the ranges of 98.0%-104.3% and 96.5%-104.5%, and the RSD is in the range of 0.23%-0.98%; for the Yellow River water (Lijin district of Shandong Province), the recoveries of iron and manganese are in the ranges of 96.0%-101.0% and 98.7%-104.2%, and the RSD is in the range of 0.13%-2.52%; for the seawater in Qingdao offshore, the recoveries of iron and manganese are in the ranges of 95.3%-104.8% and 95.3%-104.7%, and the RSD is in the range of 0.14%-2.66%. It is found that 21 common cations and anions do not interfere with the determination of iron and manganese under the optimum experimental conditions. This method exhibits good reproducibility and high accuracy in the determination of iron and manganese and can be used for the simultaneous determination of iron and manganese in tap water and natural water. By using the established ANN- catalytic spectrophotometric method, the iron and manganese concentrations of the surface seawater at 11 sites in Qingdao offshore are determined and the level distribution maps of iron and manganese are drawn.     

有机试剂萃取比色法直接测定岩石、水系沉积物和土样中三价铁

本文探讨了直接测定三价铁的萃取比色法。该方法基于Fe~(3+)与8-羟基喹啉形成的络合物能被萃取入氯仿层,而在同一体系中的Fe~(2+)与邻菲咯啉形成的络合物却不然,这就使比色法测定有机相中的三价铁成为可能.本方法重现性好,准确度高,RSD％(n=10):1.44,适用于岩石、水系沉积物和土样中三价铁的测定。     

A Kinetic Spectrophotometric Method for the Determination of Iron (Ⅲ) in Water Samples

A new kinetic spectrophotometric method has been developed for the determination of iron (Ⅲ). The method is based on the catalytic effect of iron (Ⅲ) on the oxidation of weak acid brilliant blue dye (RAWL) by KIO4 in acid medium. The advantages of the proposed method are that it is sensitive, accurate, rapid, inexpensive, can be operated under room temperature and has a large determination concentration range compared to other techniques. The obtained optimum conditions are: pH 3.15, RAWL (200 mgL-1) 5.00mL, Potassium periodate solution (0.01 molL-1) 0.30mL, phenanthroline (0.02molL-1) 1.00mL, reaction temperature 25℃ and reaction time 7 miu. With this method iron could quantitively be determined in the range 0.00-0.02 mgL-1, the detection limit being 4.10×10-10mL-1. The relative standard deviations (RSD) in five replicate determinations for 3 μgL-1 and 5μgL-1 iron (Ⅲ) are 3.1% and 1.9%, respectively. The method has been applied to the determination of iron (Ⅲ) in tap water samples and seawater samples (from the South China Sea), the recovery rates being 98.0% and 100.5%, respectively.     

A Kinetic Spectrophotometric Method for the Determination of Iron （Ⅲ） in Water Samples

A new kinetic spectrophotometric method has been developed for the determination of iron (Ⅲ). The method is based on the catalytic effect of iron (Ⅲ) on the oxidation of weak acid brilliant blue dye (RAWL) by KIO4 in acid medium. The advantages of the proposed method are that it is sensitive, accurate, rapid, inexpensive, can be operated under room temperature and has a large determination concentration range compared to other techniques. The obtained optimum conditions are pH 3.15, RAWL (200 mgL-1) 5.00mL, Potassium periodate solution (0.01 molL-1) 0.30mL, phenanthroline (0.02molL-1) 1.00mL, reaction temperature 25℃ and reaction time 7 miu. With this method iron could quantitively be determined in the range 0.00-0.02 mgL-1, the detection limit being 4.10×10-10mL-1. The relative standard deviations (RSD) in five replicate determinations for 3 μgL-1 and 5μgL-1 iron (Ⅲ) are 3.1% and 1.9%, respectively. The method has been applied to the determination of iron (Ⅲ) in tap water samples and seawater samples (from the South China Sea), the recovery rates being 98.0% and 100.5%, respectively.     

Membrane preconcentration of iron in seawater samples and on-site determination in spectrophotometry

A novel method for on-site determination of trace iron was developed using membrane preconcentration and spectrophotometric detection. Fe(Ⅱ)-ferrozine complex was reacted with cetyltrimethylammonium bromide (CTAB) to form a Fe(Ⅱ)-ferrozine-CTAB paired compound, which was collected on a membrane by filtration under vacuum. The membrane was immersed in 2 mL of ethanol-nitric acid and the absorbance of the solution measured for quantitative analysis. Various factors affecting the iron collection and determination were investigated. With different sample preconcentration volumes, the range of determination was broadened to 0.5-120 g/L. The detection limit of this method reached 0.19 g/L and the recoveries were between 97.2 and 109% when the concentration enrichment was about 45. The relative standard deviation (n = 7) was 1.9% for samples containing 10 g/L Fe. Twelve seawater samples were analyzed on-site using the proposed method, and two were also analyzed in inductively coupled plasma mass spectrometry. No significant difference was shown between the two methods by the Student’s t-test. The method has also been used on-site for iron enrichment experiments with phytoplankton and concluded to be simple, accurate and inexpensive.     

ICP-AES快速测定钛铁矿精粉中钛、铁、钒的含量

钛铁矿精粉中二氧化钛的含量一般在40%~50%,全铁含量一般在30%~45%,二者在钛铁矿精粉分析过程中对其他组分测定造成干扰,同时大量钛的水解会造成分析工作的失败,通过氢氟酸—王水—硫酸分解样品,在8%的硫酸和10%的盐酸介质中,用ICP-AES以国家标准物质作标准曲线,快速测定钛铁矿精粉中钛、铁、钒的含量,该法简便快速,选择性好,准确度高。     

静态GPS在角峪铁矿普查控制测量中的应用

角峪铁矿普查项目采用现代大地测量的方法,利用已知的3个D级GPS点,以E级GPS控制网作为测区首级控制网,选用6个E级点构成骨架网,按照GPS网的效率、可靠性、精度,进行优化设计。在四等水准点的基础上,高程测量采用GPS拟合高程的方法。结果表明,应用此方法构造的E级控制网,精度完全符合矿区普查的需要。     

井中三分量磁测在旧县铁矿普查中的应用

井中磁测主要是测量钻孔周围空间磁性体的磁场,从而起到找矿或解决某些地质问题的作用。在铁矿普查中,由于钻孔往往穿过或靠近矿体,且矿体与围岩磁性差异较大,因而井中磁测更容易发现孔旁或孔底盲矿。山东省东平县旧县地区铁矿属沉积变质型,围岩均不具有磁性或磁性极弱,具备了磁法找矿的物性基础。该矿床主矿体埋藏较深,矿体较薄,勘探难度较大。而矿体的发现得益于紧密结合的地质与物探资料的二次开发。其中井中三分量磁测对深部矿体的发现起了重要作用。通过对ZK408孔开展井中三分量磁测,准确预测了井底盲矿的存在,为钻孔继续钻进与否的决断提供了可靠依据,在不保证漏掉磁性体的前提下减少了钻探工作量,节约了生产成本。对勘查区内磁性体的赋存状态和空间位置做出了合理推断,为东平县旧县铁矿探明储量提供了地球物理依据,为下一步地质工作提供了参考意见。井中三分量磁测在寻找深部磁性矿体方面具有科学准确的指导作用,为旧县铁矿深部找矿和外围找矿提供了新思路。     

内蒙古苏尼特左旗扎拉格沃博勒卓铁矿地质特征与找矿标志

苏尼特左旗扎拉格沃博勒卓铁矿位于内蒙古中部,地处卡巴-红格尔庙铁成矿带,成矿地质条件优越。区内的铁矿主要赋存于蓟县纪温都尔庙群上部哈尔哈达组中,发育的温都尔庙式褐铁矿,属沉积变质型,是以往铁矿勘查的重点。该次勘查除发现上述类型铁矿外,在矿区及外围广泛分布的中元古代变辉长岩中,发育有具工业意义的磁铁矿体,矿床成因为岩浆熔离型。因此,今后在该地区进行铁矿勘查关注沉积变质型铁矿的同时,也应注意后期岩浆熔离型铁矿的寻找。     

ICP-AES内标法测定钛铁矿中铜钴镍锰钒铬

采用HCl-HNO3-HF-H2SO4溶矿,利用电感耦合等离子体发射光谱仪内标法（ICP—AES）测定,建立了钛铁矿、钒钛磁铁矿中铜、钴、镍、锰、钒、铬等元素的同时测定方法。对电感耦合等离子体发射光谱仪测定的最佳仪器条件及分析谱线进行了选择,并对钛、铁基体的影响以及采用Y内标元素消除基体的影响进行了研究。实验结果表明：采用内标法能够消除基体对被测元素的影响,改善分析准确度和精密度,与经典分光光度法和原子吸收法相比较,具有检出限低、灵敏度高,操作简便、快速等突出优点。方法经国家一级钒钛磁铁矿标准物质验证,测定值与标准值吻合。