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钯—二安替比林对溴苯基甲烷—钒体系阻抑动力学光度法测定微量钯 总被引:6,自引:0,他引:6
在H3PO4介质中,微量Pd(Ⅱ)能阻抑二安替比林对溴苯基甲烷(DApBM)与V(Ⅴ)的显色反应,阻抑程度与Pd(Ⅱ)量呈线性相关。据此建立了测定微量Pd(Ⅱ)的新方法。方法检测限为56.0μg/L,测定范围为0.0~480.0μg/LPd(Ⅱ)。阻抑反应的表观活化能为86.72kJ/mol,表观速率常数为5.57×10-4/s,反应终止后至少稳定24h。试样的加标回收率为91.7%~101%(n=4)。该法用于w(Pd)在10-3水平的冶金产品和催化剂中钯的测定,结果与原子吸收法测定结果相符,RSD(n=6)在2.8%~3.3%。 相似文献
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对羧基偶氮氯膦与锆显色反应及应用 总被引:3,自引:0,他引:3
在056mol/LHNO3介质及溴化十六烷基吡啶存在下,Zr(Ⅳ)与对羧基偶氮氯膦形成1∶2的蓝色络合物。其λmax=685nm,ε685=685×104,Zr(Ⅳ)的质量浓度为在0~08mg/L时符合比尔定律。所建立的方法用于熔铸氧化铝和陶瓷釉料中Zr的测定,结果与推荐值相符,对于w(Zr)=118%熔铸氧化铝测定6次,其RSD=088%。 相似文献
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研究了新显色剂2-[2-(5-甲基苯并噻唑)偶氮]-5-二乙氨基苯甲酸(5-Me-BTAEB)的离解平衡及与Fe2+形成配合物的条件。在十二烷基硫酸钠的存在下,5-Me-BTAEB与Fe2+形成稳定的蓝紫色2∶1配合物,其最大吸收波长为640nm,表观摩尔吸光系数为1.03×105L·mol-1·cm-1。Fe2+的质量浓度在0~480μg/L时服从比尔定律。方法用于部级铝合金标样中微量铁的测定,结果与推荐值相符,对w(Fe)为0.1%~0.5%的样品测定10次,RSD在0.85%~1.95%,用于测定矿泉水中w(Fe)/10-6铁的测定,RSD<1.5%(n=7),加标回收率98.9%~99.4% 相似文献
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研究了在混合表面活性剂溴化十六烷基吡啶(CPB)及乳化剂OP存在下,二溴羟基苯基荧光酮(DBHPF)与铜显色反应的条件。结果表明:在pH5.4的六次甲基四胺HCl缓冲介质中,DBHPF与铜生成紫色络合物,λmax=538nm,ε538=1.65×105L·mol-1·cm-1。铜量在0~360μg/L符合比尔定律。方法经实际试样验证,结果与原结果相符。对w(Cu)为0.044%~0.3%的样品进行测定,RSD(n=6)为1.71%~5.53%。 相似文献
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N-间甲苯基-N′-(对氨基苯磺酸钠)硫脲与铜的显色反应及应用 总被引:1,自引:0,他引:1
研究了新试剂N-间甲苯基-N′-(对氨基苯磺酸钠)硫脲(MMPT)与Cu2+的显色反应。结果表明,在pH4.6~5.6的HAc-NaAc介质中,Cu2+与MMPT形成的配合物至少稳定5h,其λmax=370nm,表观摩尔吸光系数为1.12×105L·mol-1·cm-1。Cu2+的质量浓度在0.08~1.4mg/L时符合比尔定律,相关系数r=0.9991。方法简便、快速,用于铅矿中铜的分析,测定结果与监控样推荐值相符,对w(Cu)=0.8%的试样测定6次,RSD=3.2%。 相似文献
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铜精矿中铅锌的连续测定 总被引:2,自引:0,他引:2
利用铜铁试剂分离Cu、Fe等干扰元素,同时铜铁试剂与Pb和Zn产生络合物吸附波,可连续测定铜精矿中的Pb和Zn。体系中铅峰在-0.54V,锌峰在-0.99V,线性范围Pb为80~1600μg/LZn为120~1200μg/L,检出限Pb为40μg/L,Zn为80μg/L,测定结果与参考值相符,RSD(n=3)Pb(n=3)Pb〈6%,Zn〈10%。 相似文献
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催化还原褪色光度法测定痕量锡 总被引:7,自引:1,他引:6
痕量锡在0.04mol/LH3PO4介质中对NaH2PO2还原罗丹明B褪色反应有催化作用,催化程度与Sn量、温度和加热时间线性相关。基于此,建立了痕量锡的动力学光度分析方法。方法检出限为0.034μg/L,线性范围为0~20μg/L,结合磷酸三丁酯色谱分离,实现了地质样品中痕量Sn的测定。方法经国家地质标准物质分析验证,结果与标准值相符。对于w(Sn)为10-6水平的试样其RSD(n=6)<6.5%。 相似文献
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本文先以恒电位电解法在c(Kcl)=0.lm0l/L,c(Hcl)=0.2mol/L介质液中,将微量金电解富集在特制石墨电极上,再用背景为内标的原子发射光谱法对金进行测定。本分析方法的回收率为97.1-106%,变动系数为8.55%,相对误差为-1.96一2.21%。操作简便快速,测定结果准确可靠 相似文献
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赣南陂头A型花岗岩的地质地球化学特征及其形成的构造环境 总被引:59,自引:10,他引:49
赣南陂头岩体主要钾长花岗岩组成,岩石为准铝质(ANKC=0.94~1.07,平均0.98),富硅(SiO2:71.06%~76.28%),富碱(Na2O+K2O:8.1%~9.8%),FeO^T/MgO(%)较高(9.60~22.00),CaO和MgO含量低(分别为0.58%~1.16%和0.07%~0.25%),富含稀土元素(∑REE=271.36~717.75μg/g)和高场强元素(Y、Zr、 相似文献
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Ivan V. BRAGIN Georgy A. CHELNOKOV Oleg V. CHUDAEV Natalia A. KHARITONOVA Sergey V. VYSOTSKIY 《《地质学报》英文版》2016,90(1):276-284
Studied waters belong to warm(T=30-50℃),alkaline(pH=8.9-9.3),low mineralized(TDS235 mg/1)Na-HCO_3 or Na-SO_4-HCO_3 thermal waters with high content of SiO_2(up to 81 mg/l)and F(up to 3.9 mg/1),occur on modern volcano-tectonic rejuvenated areas of Eastern Sikhote-Alin orogenic belt.Low~3He concentration as well as N_2/O_2 and N_2/Ar ratios exclude influence of deep mantle fluid.New rare earth element data constrain our understandmg of water-rock interaction occurring in the water source region.Meteoric origin of waters is proved by stable isotope values varying from-71‰to-136.1‰and from-10.8‰to-18.8‰forδ~2U andδ~(18)O respectively.REE patterns reflect high pH,resultfing from water-rock interaction and oxidative conditions.Calculations of deep aquifer temperature using Na-K and quartz geothermometers show 116.8-131.1°C and 82.2-125.8℃respectively.Presence of deep faults both with abnormal thermal gradient(~45-50 K/km)define unique geochemical shape of thermal waters of Sikhote-Alin,area,where no present volcanic activity is registered. 相似文献
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考虑核电厂地基-基础的动力相互作用,应用显式动力有限差分法分析了地震作用下极软岩、较软岩、坚硬岩上核电厂建筑结构基础的地震响应特征,比较了岩石坚硬程度对基础加速度反应谱的影响。研究表明:随着岩石坚硬程度的提高,核电厂建筑物结构基础的地震响应有增加的趋势;在周期轴上,基础处的加速度反应谱曲线会随着岩石坚硬程度的提高逐渐向短周期(高频段)方向移动。在高频段,建造于较坚硬岩石上基础结构的加速度反应谱值偏大;在中等频段,建造于较软岩石上基础结构的加速度反应谱值偏大;在低频段,岩石坚硬程度对加速度反应谱的影响不显著。 相似文献
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沉管隧道基槽爆破施工对既有堤岸稳定性影响的数值仿真分析 总被引:1,自引:0,他引:1
结合爆破数值模拟中爆破荷载的特点,分析了各种荷载施加方法的特点及爆破震动场模拟的要求,基于圣维南荷载等效原理,提出了爆破荷载的等效施加方法,即将作用在炮孔壁上的爆破荷载等效后,施加在同排炮孔中心线或者面上来模拟爆破荷载的作用。结果表明,等效施加方法在近区存在一定差异,但在中远区吻合得较好。利用该等效荷载施加方法,采用三维实体模型计算分析了某沉管隧道基槽爆破施工对既有堤岸稳定性影响,计算了周围不同位置、不同深度位置处的振动响应,并在此基础上,分析研究了减小爆破振动对既有结构物影响的减振措施,可为类似工程提供借鉴。 相似文献
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M. D. Sharma 《Journal of Earth System Science》2004,113(2):247-257
Three dimensional scattering of near-field is studied for dilatation and rotation in the time domain. The perturbation method
is applied to solve the equation of motion for the first order scattering from a weak inhomogeneity in an otherwise homogeneous
medium. The inhomogeneity is assumed close enough to the point source so that the near-field intermediate wave is dominating
over the far-field sphericalP andS pulses. The integral expressions are derived to relate dilatation and rotation of scattering to the radial fluctuations of
velocities and density in the inhomogeneity. These integrals are solved to calculate the strains of scattering from (a part
of) an inhomogeneous spherical shell of arbitrary curvature. Variable curvature may allow the shape of inhomogeneity volume
element to change uniformly from spherical to rectangular. Rotation of scattering from a spherical shell is independent ofP wave velocity inhomogeneity. Dilatation of scattering does not involveS wave velocity inhomogeneity but its gradient. The back scattering results are obtained as a special case. Strains are computed
numerically, for hypothetical models to study the effects of various parameters viz., velocity inhomogeneity, distance of
source from inhomogeneity and from receiver, and thickness of inhomogeneity. The curvature of the spherical shell is varied
to study the effects of the shape of inhomogeneous volume element on scattering. 相似文献
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A. Anandarajah 《Engineering Geology》1997,47(4):491-323
In an assembly of clay particles placed in a fluid, each particle is typically subjected to: (1) double-layer repulsive forces; (2) van der Waals attractive forces; and (3) contact mechanical forces. The study presented here concerns an approximate, quantitative analysis of clay suspensions, with considerations to the first two - the physico-chemical forces. Using recent theories to calculate the physico-chemical forces between two clay particles in an approximate model of an assembly, the equilibrium void ratio of a clay suspension is computed. The mechanical forces are ignored in the analysis. The results serve to verify the validity of physico-chemical theories employed and help interpret experimental data more fundamentally in terms of the system variables. 相似文献
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