共查询到20条相似文献，搜索用时 156 毫秒
1.
2.
3.
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。 相似文献
4.
李绍卿 《地球科学与环境学报》1993,(4)
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。 相似文献
5.
采用HClHNO3HF HClO4,HClHNO3HF H2SO4敞口和HClHNO3HFHClO4,HClHNO3HF H2SO4微波消解4种方法溶矿,利用电感耦合等离子体发射光谱（ICPAES）测定,建立了钛铁矿中钾、钠、钙、镁、钡、锶、锌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、溶矿提取酸度以及溶矿残渣进行了研究。实验结果表明：采用HClHNO3HF HClO4敞口溶矿,具有检出限低、灵敏度高,操作简便、快速等突出优点。该方法测定值与推荐值基本吻合,分析方法的精密度满足《地质矿产实验室测试质量管理规范》的要求。 相似文献
6.
废水中二苯胺的分析方法有气相色谱和液相色谱法。气相色谱法不能直接测定水中二苯胺的含量，需经过提取、浓缩等过程；液相色谱法则操作费用较高。因此，这2种方法作为选择工艺条件的监测手段都有缺陷。本文利用二苯胺易被氧化的性质建立了水溶液中二苯胺的间接吸光光度法。该法的原理是以铁（Ⅲ）—邻菲罗啉混合液为显色剂在一定的条件下使二苯胺将Fe^3＋还原为Fe^2＋，产生的Fe^2＋再与邻菲罗啉显色并测定，从而间接测定出废水中二苯胺的含量。 相似文献
7.
8.
9.
采用HCl-HNO3-HF-HCl O4,HCl-HNO3-HF-H2SO4敞口,HCl-HNO3-HF-HCl O4密闭和HNO3-HF密闭消解4种方法溶矿,利用电感耦合等离子体发射光谱(ICP-AES)测定,建立了超基性岩石中钾、钠、钙、铝、铁、钛、锰、钴、镍、铬、钒、锶、锌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,并对镁基体的影响进行了研究,采取标准溶液中加入适量的镁作基体匹配,以消除基体影响。实验结果表明:采用HNO3-HF密闭溶矿,具有检出限低、灵敏度高,操作简便、快速等突出优点。该方法测定值与推荐值基本吻合,分析方法的精密度满足《地质矿产实验室测试质量管理规范》的要求。 相似文献
10.
11.
电气石因其特殊的物理性质而被国内外学者广泛关注，并形成了大量的研究成果和应用专利。目前国内外对电气石的研究主要集中在晶体矿物学、找矿矿物学和岩石矿物学、晶体物理化学特性、矿床资源特征4个方面。自20世纪40年代以来，围绕电气石的晶体结构和电气石物理特性的内在动因等，中外学者做了大量深入细致的基础研究，并在利用电气石的化学成分判断成矿、成岩地质环境方面取得了许多宝贵的经验。近几年，国内外利用电气石的物理特性制造环保、保健产品等获得突破，展现了电气石的良好开发前景。 相似文献
12.
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。 相似文献
13.
作者在辽东地区把甚低频(VLF)法应用于金矿、硼镁铁矿、铜矿、钼矿和煤矿的普查勘探工作中。通过6个矿区,9条VLF剖面的测量,发现VLF法在固体矿产普查中异常显著,并与已知矿体吻合,找矿效果较好。应用VLF法不公可以发现良导体矿,而且可以确定矿体的产状、规模和矿体叠加状态。VLF法应用于普查表层矿产,其效果更为显著。 相似文献
14.
金属元素活动态是我国5种深穿透地球化学技术中应用最广的方法之一。此方法是通过提取地表土壤一定深度介质中元素活动态的微弱隐伏矿信息而找寻隐伏矿,属于通过直接信息找矿,目前该方法的标准化程度不高。为将铜元素活动态应用于地质找矿,该文对铜元素4个活动态的相态(水浸出态、粘土吸附态、有机链合态、铁锰氧化物态)循序提取的条件及ICP-AES测定技术进行了研究,包括采样深度、分析样品粒度、样品存放时间、提取条件、测定干扰等,通过对铜活动态提取液处理方法的改进,提高了分析速度和分析数据的精度。由实验数据计算出各相态方法的检出限和精密度RSD(n=10),水浸出态为0.079mg/L,13.90%～22.49%;粘土吸附态为0.275mg/L,11.99%～23.29%;有机链合态为0.362mg/L,10.70%～57.27%;铁锰氧化物态为0.230mg/L,17.83%～38.61%。该方法操作方便,精密度较好,应用于碑楼隐伏铜矿的野外探测实验,探测结果所圈定的综合异常与实际矿体的水平投影相符,取得了较满意的试验效果,该方法可应用于不同地质景观区。 相似文献
15.
SYNTHESIS AND PROPERTIES OF SULFHYDRYL CHITOSAN 总被引：1，自引：0，他引：1
A new adsorbent for heavy metal ions, sulfhydryl chitosan (S-chitosan), was produced by treatment of chitosan with sulhydryl acetic acid in the presence of sulfuric acid as a catalyst. Its structure was confrrmed by elemental analysis and FI‘-IR spectra analysis. The adsorption properties of sulthydryl chitosan for Cu(Ⅱ ), Cd(Ⅱ ), Pb(Ⅱ), Cr(Ⅲ) and Ni(Ⅱ) were investigated, and the effect of pH value on adsorption, adsorption kinetics, and selective adsorption was examined. It was shown that S-chitosan has good adsorption for Pb(Ⅱ), Cu(Ⅱ) and Cd(Ⅱ) like chitosan, is also insoluble in acid solution; has good adsorption kinetic properties for heavy metal ions; and can be used in acid solution. The adsorption capacities of S-chitosan can be affected by media acidity. The adsorbed Cu(Ⅱ) Cd(Ⅱ) and Pb(Ⅱ) could be eluted by diluted chlorhydric acid. 相似文献
16.
The Duobaoshan mine area in Heilongjiang is located in the northeast section of Xingmeng orogenic belt and is in the west side of Hegang Mountain-Heihe fault zone .There exist many deposits in this area , and its metallogenic conditions are superior , which has been one of the hotspots in geological prospecting and metal -logenic research in Northeast China .On the basis of previous studies , the authors used the EH-4 electromagnet-ic imaging system to carry out the data acquisition of three survey lines in Woduhe Village , Duobaoshan Town , Nenjiang County .Through the analysis of apparent resistivity section under TE and TM polarization modes , in-tegrating regional geological data , it is concluded that:①the electrical characteristics of the metal ore in this area show a relatively low resistance , and according to its resistivity difference with surrounding rocks , the geo-metrical structures and apparent resistivity parameters of the low resistivity bodies in the lower section of the sur -vey line are defined , and the electrical anomalies can be identified;②faults F1 and F2 may have a good metal-logenic environment , so they are recommended for further exploration;③low resistance metal ore bodies have good correlation with local small structures or faults , which may play an iconic role for the delineation of key target areas;④in the process of using apparent resistivity to define the geometric structures of ore bodies un -derground , comprehensive analysis integrating the advantages of TE and TM models should be carry out to achieve more reliable inversion results . 相似文献
17.
Comparison of finite difference and pseudo-spectral methods in forward modelling based on metal ore model of random media 总被引：1，自引：0，他引：1
《世界地质(英文版)》2016,(2):102-108
With more applications of seismic exploration in metal ore exploration,forward modelling of seismic wave has become more important in metal ore.Finite difference method and pseudo-spectral method are two im-portant methods of wave-field simulation.Results of previous studies show that both methods have distinct ad-vantages and disadvantages:Finite difference method has high precision but its dispersion is serious;pseudo-spectral method considers both computational efficiency and precision but has less precision than finite-diffe-rence.The authors consider the complex structural characteristics of the metal ore,furthermore add random media in order to simulate the complex effects produced by metal ore for wave field.First,the study introduced the theories of random media and two forward modelling methods.Second,it compared the simulation results of two methods on fault model.Then the authors established a complex metal ore model,added random media and compared computational efficiency and precision.As a result,it is found that finite difference method is better than pseudo-spectral method in precision and boundary treatment,but the computational efficiency of pseudo-spectral method is slightly higher than the finite difference method. 相似文献
18.
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。 相似文献
19.
Heavy metal is a main pollutant in the marine ecosystem . so study on the effect of heavy metal on phytoplankton is important . Algae (Chaetoceros sp . , Dunaliella sp . ., Dicrateria zhanjiangenis Hu . var . sp .) were laboratory cultured to observe the effect of heavy metals on their growth . The effect of different metal ion concentration , the detoxication effect of complexation agents and the growth of algae in different media and different nutrition levels were studied to evaluate the effect of metal speciation . It is proved that trace amount of heavy metals can stimulate the growth of algae cells but that high concentration is lethal . The sequence of toxicity is Cd2+>Zn2+>Pb2+ . In ordinary nutrition conditions , the detoxication sequence of complexation agents to Chaetoceros sp . is EDTA > sodium salicylate > sodium oxalate > sodium citrate > sulfanilic acid > O-phenanthroline . This is in good conformity with the stability constant sequence of these agents with copper and good evidence that t 相似文献
20.
金属活动态提取法及其在黑龙江大兴安岭森林覆盖区的应用 总被引：1，自引：0，他引：1
文雪琴 《地球科学与环境学报》2006,28(4):43-48
介绍了金属活动态的理论依据、成晕机制及提取方法,并应用金属活动态提取法在大兴安岭原始森林覆盖区对已知矿进行试验研究,发现在高寒森林覆盖区,利用金的水提取态异常强度低,异常不明显,而金的粘土结合态和铁锰氧化物结合态异常清晰地反映在矿体上方,异常强度居于中等。金的有机质结合态异常值虽然高,但容易受有机质在样品中颗粒大小等因素的影响而使异常出现多个峰值。总之,利用金属活动态提取法在高寒森林覆盖区进行找矿可以快速有效地确定异常,但要注意排除过多有机杂质在提取过程中的影响。 相似文献