火焰原子吸收光谱法测定硒碲混合物中碲的研究

本文建立了酒石酸-硝酸盐酸混酸溶解样品,在王水-酒石酸介质中,采用空气-乙炔火焰在原子吸收光谱仪上测定硒碲混合物中的碲的方法。本实验研究了样品处理方法、乙炔流量、燃烧高度、灯电流、溶液介质等有关工作条件。实验表明碲浓度在1～20ug/mL范围内与吸光度呈良好的线性关系,回归方程为A=0.0229C 0.0009,相关系数0.9998,检出限0.08ug/mL,本方法适合于硒碲混合物中碲的测定,相对标准偏差为0.9%～1.3%,回收率为98%～102%。     

氢化物发生-原子荧光光谱法(HG-AFS)测定特硬铅合金中硒和碲

建立了氢化物发生-原子荧光光谱法(HG-AFS)测定特硬铅合金中硒和碲的分析方法。试样经硝酸和酒石酸溶解,硫酸沉淀分离基体铅元素。移取部分试液,在40%盐酸介质中直接用氢化物发生-原子荧光光谱法(HG-AFS)测定样品中的硒;另移取部分试液,加入氢溴酸挥发除去砷、锑、锡、硒等元素,在40%盐酸介质中用氢化物发生-原子荧光光谱法(HG-AFS)测定样品中的碲。考察了测定的最佳条件、铅及共存元素对测定的影响。测定硒和碲的相对标准偏差分别为7.5%～9.3%和3.6%～13.0%,加标回收率分别为88%～92%和98%～102%。准确度和精密度均能满足分析需要,具有较强的实用性。     

电感耦合等离子体原子发射光谱法(ICP-AES)测定贵金属车间外排水中的铜、硒、碲

建立了电感耦合等离子体原子发射光谱法测定贵金属外排水中铜、硒、碲3种元素含量的分析方法。选择仪器的最佳工作条件为射频功率1 150 W,雾化器流速0.5L/min,观测高度12mm。确定了各元素测定谱线铜327.396nm、硒196.090nm、碲214.281nm作为各元素的分析线,方法的回收率在98%~103%,测定结果相对标准偏差(n=7)在0.97%~3.1%,检出限铜为0.001μg/mL、硒为0.010μg/mL、碲为0.007μg/mL,方法快速,简捷,有良好的精密度和准确度,能够满足日常生产检测需要。     

氢化物发生-原子荧光光谱法测定高纯阴极铜中硒、碲

本文报道了采用氢化物发生-原子荧光光谱法(HG-AFS)测定高纯阴极铜中硒、碲。实验考察了盐酸、三氯化铁的浓度对氢化物发生效率的影响,探讨了铜和其它共存元素的干扰情况。该法测定硒、碲的检出限分别为0.27μg/L、0.11μg/L,加标回收率分别为94.9%～114.0%、91.8%～105.3%,精密度为1.5%～7.8%。     

微波消解试样-原子荧光光谱法测定土壤中硒碲

应用HG-AFS法及微波加热试样消解法测定了土壤中硒和碲的含量,对试样消解参数、仪器工作条件及氢化物发生反应条件等作了试验并讨论.该方法测定硒及碲的检出限均为0.01μg·g-1,荧光强度与硒及碲的质量浓度在5～100μg·L-1及0.5～10μg·L-1范围内呈线性关系.应用此方法分析了3个土壤试样,测定值的相对标准偏差(n=6)均小于5%.用标准加入法作了回收试验,硒的回收率在92.0%～102.6%之间,碲的回收率在90.1%～98.8%之间.     

IＣＰ－ＡＥＳ法测定铜阳极泥和分银渣中锡、碲的含量

目前资料介绍测定锡的方法大都比较繁琐,本文探索了氢氧化钾、硝酸钾熔融, 在氨水—氯化铵介质中,用氢氧化铁共沉淀分离和富集锡、碲后,标准系列中加入铁,进行基体匹配,用ICP－ＡＥＳ法测定铜阳极泥和分银渣中锡、碲的含量。本文对测定锡、碲的条件及共存元素的干扰情况进行了研究,方法的检出限: 锡为0.0012 μg/mL、碲为0.024μg/mL ;加标回收率：锡为98.00%～100.33%;碲为99.00%～102.00%;相对标准偏差：锡为2.42%～6.61%;碲为：1.32%～11.48%。方法简单快速,易于掌握。测定范围：0.02%～5.0%     

电感耦合等离子体原子发射光谱法(ICP-AES)测定铜阳极泥和分银渣中锡、碲的含量

建立了氢氧化钾、硝酸钾熔融,在氨水-氯化铵介质中用氢氧化铁共沉淀分离和富集锡、碲后,在标准系列中加入铁进行基体匹配,用电感耦合等离子体原子发射光谱法(ICP-AES)测定铜阳极泥和分银渣中锡、碲含量的方法。对测定锡、碲的条件及共存元素的干扰情况进行了研究,锡、碲的检出限分别为0.0012、0.024μg/mL;加标回收率为98.0%～100.3%、99.0%～102.0%;相对标准偏差为2.4%～6.6%、1.3%～7.0%。方法简单快速,易于掌握。测定元素的含量范围为0.02%～5.0%。     

共沉淀分离-ICP-MS测定高纯阴极铜中硒和碲

研究了采用共沉淀分离手段在氨性条件下分离大量铜基体并富集痕量硒、碲杂质的实验条件。优化选择了共沉淀剂的种类、浓度、氨水用量和温度等条件，考察了内标元素、铜残留浓度对ICP-MS测定的影响。与直接测定法相比，硒碲被富集了50倍，建立了共沉淀分离-ICP-MS测定高纯阴极铜中硒碲的方法。硒碲测定下限分别为0．08和0．10μg／g，RSD〈10％，加标回收率在90％-115％之间。方法已用于实际样品分析。     

电感耦合等离子体原子发射光谱法测定纯银中镉、铋、铁、铅、锑、钯、硒、碲

样品用硝酸溶解,加入过量盐酸沉淀分离银,过滤后利用电感耦合等离子体原子发射光谱法测定镉、铋、铁、铅、锑、钯、硒、碲,方法检出限分别为:0.0028,0.0075,0.0036,0.011,0.010,0.021,0.0075,0.0039μg/mL;加标回收率为98.1%～114.3%;RSD小于4.2%,方法能同时准确测定镉、铋、铁、铅、锑、钯、硒、碲,满足日常分析要求。     

氢化物发生-原子荧光光谱法同时测定铜精矿中硒和碲的含量

样品0.500 0~1.000 0g与活性炭0.15g和捕集剂氧化镁-氧化锌-碳酸钠(质量比为1∶2∶3)的混合物3g充分混匀,并于750℃焙烧1h,使样品中硒和碲分别生成各自的钠盐。加水50mL和几滴乙醇浓缩至25mL,定容至50mL。分取溶液10.00mL,加入3.6mol·L-1盐酸溶液7mL,加入掩蔽剂20g·L-1三氯化铁溶液1mL掩蔽干扰元素,于沸水浴中保持40min,冷却,定容至25mL作为测试溶液,用氢化物发生-原子荧光光谱法测定其中硒和碲的含量。硒和碲的质量浓度均在100μg·L-1以内与荧光强度呈线性关系,检出限(3s)分别为0.037,0.025mg·kg-1。按此方法测定了两种国家标准物质(GBW 07166和GBW 07234)中硒和碲的含量,标准值和认定值相符。     

Tetravalent Tellurium Ligands

Oxidative addition of TeCl₄ to Vaska's complex gave the trichlorotelluronium complex [IrCl₂(TeCl₃)(CO)(PPh₃)₂] (structure depicted), which contains a rare example of a structurally characterized tetravalent tellurium ligand. The coordination at the Te^IV center is—in full agreement with the VSEPR model—distorted trigonal bipyramidal.     

由工业碲制备高纯碲

碲是制作半导体，制冷元件，光电元件等的理想材料．随着航天、航空、军事、电子以及制冷、玻璃、有机合成工业等的迅速发展，对碲及其化合物的需求量和纯度要求越来越高［１］．文献［２］所述制备高纯碲的方法为溶５０ｇ工业碲（９９．９％）于王水中，过滤．然后在滤液...     

Antibacterial Activities of Tellurium Nanomaterials

We prepared four differently shaped Te nanomaterials (NMs) as antibacterial reagents against Escherichia coli. By controlling the concentrations of hydrazine (N₂H₄) as reducing agent, NaCl, and temperature, we prepared Te nanowires, nanopencils, nanorices, and nanocubes. These four Te NMs resulted in a live/dead ratio of E. coli cells of less than 0.1, which is smaller than that of Ag nanoparticles. The order of antibacterial activity against E. coli is nanocubes ≈ nanorices > nanopencils ≈ nanowires. This is in good agreement with the concentration order of tellurite (TeO₃²⁻) ions released from Te NMs in E. coli cells, revealing that TeO₃²⁻ ions account for the antibacterial activity of the four Te NMs. We found that spherical Te nanoparticles (32 nm in diameter) with TeO₃²⁻ ions were formed in the E. coli cells. Compared to Ag nanoparticles that are commonly used as antibacterial reagents, Te NMs have higher antibacterial activity and lower toxicity. Thus, Te NMs hold great practical potential as a new and efficient antibacterial agent.     

Synthesis of CdTe Quantum Dots with Tunable Photoluminescence Using Tellurium Dioxide as Tellurium Source

A simple and convenient method has been developed for synthesis of water‐soluble CdTe quantum dots (QDs) under ambient atmospheric conditions. In contrast to the traditional aqueous synthesis, green to red emitting CdTe QDs were prepared by using TeO₂ to replace Te or Al₂Te₃ as tellurium source in this method. The influences of experimental variables, including pH value, 3‐mercaptopropionic acid (MPA)/Cd and Te/Cd molar ratios, on the emission peak and photoluminescence (PL) quantum yield (QY) of the obtained CdTe QDs have been systematically investigated. Experimental results indicate that green to red emitting CdTe QDs with a maximum photoluminescence quantum yield of 35.4% can be prepared at pH 11.3 and n_(Cd):n_(Te):n_(MPA)=1:0.1:1.7.     

Determination of Tellurium by Electrothermal Atomic Absorption Spectroscopy: Isolation of Tellurium from Potential Interferences

Abstract

The determination of tellurium at nanogram levels using electrothermal atomic absorption spectroscopy is examined. Severe interferences are observed in the presence of many elements but can be overcome by the use of a sequential extraction scheme.     

Alkoxytelluration of Styrene with Tellurium Tetrahalides

Russian Journal of General Chemistry - An efficient synthesis of the earlier unknown trichloro- and tribromo(2-ahkoxy-2-phenylethyl)-λ4-tellanes with yields of 90 to 100% has been developed...     

The atomic absorption spectroscopy of Tellurium

Telluiium can be determined by atomic absorption spetroscopy at 2143, 2359, and 2386 A The sensitivities for these lines are in the ratio of 1.9.9 187 With aqueous solutions, a Beckman triple-buiner (air-hydrogen) and a 5-pass optical system, the line 2143 Å has a sensitivity of 0.23 p.p.m , and a detection limit ot 0.076 p.p.m The sensitivities for this line in acqueous and organic solvents, and in air-hydrogen and air-acetylene flames were studied and the optimum conditions determined Where necessary, preconcentration of tellurium by coprecipitation with elemental arsenic, 01 by extraction of K₂Tel₆ or tellurium diethyldithiocarbomate with MIBK can be applied, the latter gives a two-fold enhancement in sensitivity compared with aqueous solutions.