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研究了在弱酸性介质中,锌(Ⅱ)催化溴酸钾氧化酸性铬蓝K的褪色反应及其动力学条件,建立了催化动力学光度法测定痕量锌的新方法。结果表明,该催化褪色反应对酸性铬蓝K,KBrO_3,H~+均为零级反应,对Zn(Ⅱ)为一级反应,测得表观活化能Ea=107.1kJ/mol,锌量在(0.16~8.0)×10~(-8)g/mL呈线性关系,检出限为1.1×10~(-10)g/mL,在NH_4F存在下大多数常见离子无干扰。用于测定水样和农产品中的痕量锌,相对标准偏差为1.4%~3.9%,加标回收率为94.5%~103%。 相似文献
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在碱性条件下,痕量钴 与三乙醇胺对H2O2氧化二甲苯蓝FF的反应有较强的负催化作用,钴含量与吸光度的增加值呈线性关系,据此建立了负催化光度法测定痕量钴的新方法。最大吸收波长λmax=638nm,表观摩尔吸光系数为1.2×105,25mL溶液中测定钴的线性范围为0~9μg。用于水样和茶叶中痕量钴的测定,结果满意。 相似文献
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在NH3.H2O-NH4Cl缓冲溶液及吐温-80存在下,痕量铜(能灵敏地催化高碘酸钾氧化氨基黑10B褪色,据此建立了一种测定痕量铜(的新方法。考察了反应的影响因素,研究了该催化反应的最佳条件,探讨了催化动力学反应机理。方法线性范围为0.002~0.01μg/mL,检出限为6.2×10-11g/mL,用于水样中铜Ⅱ的测定,结果满意。 相似文献
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基于在稀H2SO4介质中,痕量锡Ⅳ催化高碘酸钾氧化变色酸2R(CMT2R)的褪色反应,建立了测定痕量锡Ⅳ的催化动力学光度法。方法检出限为0.24μg/L,线性范围为0.0~8.0μg/L。在25 mL溶液中,测定0.2μg锡Ⅳ的相对标准偏差为3.4%(n=11)。讨论了酸度、反应物浓度、温度、反应时间、干扰离子等因素的影响;研究了反应的最佳条件,并测定了一些动力学参数,催化反应的表观活化能为54.42 kJ/mol。结合巯基葡聚糖凝胶(SDG)分离富集,实现了样品中痕量锡(的测定。方法经水系沉积物国家标准 相似文献
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研究了显色剂2-(5-羧基-1,3,4-三氮唑偶氮)-5-二乙氨基苯甲酸(CTZDBA)与锌的显色反应。试剂与Zn2+在pH8.0的NH3.H2O-NH4Cl缓冲溶液中形成紫红色络合物,组成比为n(Zn2+)∶n(CTZDBA)=1∶2。络合物的最大吸收波长为545 nm,表观摩尔吸光系数ε=4.13×104L.mol-1.cm-1,Zn2+质量浓度在0.08~0.8 mg/L范围内符合比尔定律,检出限为1.57×10-8g/mL。方法不经分离直接测定镁合金和铝合金样品中微量锌,测定结果与认定值相符。 相似文献
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研究了铜(II)催化H2O2氧化2,7-双(5-羧基-1,3,4-三氮唑偶氮)-H酸(BCTZAHA)褪色反应及其动力学条件,并基于褪色反应程度与铜(Ⅱ)量在一定范围内呈线性关系,建立了测定痕量铜(Ⅱ)的催化动力学光度法。在pH 10.0的NH3·H2O-NH4Cl 缓冲溶液介质中,褪色体系的最大吸收波长为540 nm,铜(Ⅱ)质量浓度在0.001~0.04 μg/mL范围呈线性关系,回归方程为△A=22.124 2 ρ+0.001 07(ρ: μg/mL),相关系数 r= 0.999 1,检出限为1.32×10-11 g/mL。方法不经分离直接测定河水、管网水和井水水样中痕量铜,结果与AAS法测定值相符。 相似文献
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Sets of benzimidazole and benzotriazole derivatives bearing on position 1 or 2 a tetrahydrofuranyl or tetrahydropyranyl moieties were prepared through the addition of the suitable benzazoles on 2,3-dihydrofuran and 3,4-dihydro-2H-pyran. The reactions were carried on either without solvent or in carbon tetrachloride solution. In the last case some peculiar chlorinated side products were isolated and characterized. Twenty compounds were screened for in vitro antitumoral and anti-HIV-1 activities and found poorly active or completely inactive. On the other hand several compounds exhibited good tracheal relaxant activity in vitro; compound 8, 11, 16, 24 and 26 resulted more active than theophylline in this test, while compound 11 was comparable to amrinone till the concentration of 3 micrograms/ml. Finally, compound 5 resulted endowed with a strong diuretic and saluretic activity at the dose of 3 mg/Kg, thus representing a new lead for discovering new diuretic agents. 相似文献
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P. Rangaswamy M. A. M. Bourke R. Von Dreele K. Bennett M. R. Daymond N. Jayaraman 《Metallurgical and Materials Transactions A》2000,31(3):889-898
Residual strain and texture variations were measured in two titanium matrix composites reinforced with silicon carbide fibers
(Ti/SiC) of similar composition but fabricated by different processing routes. Each composite comprised a Ti-6242 α/β matrix alloy containing vol 35 pct continuous SiC fibers. In one, the matrix was produced by a plasma sprayed (PS) route,
and in the other by a wiredrawn (WD) process. The PS and WD composites were reinforced with SCS-6 (SiC) and Trimarc (SiC)
fibers, respectively. The texture in the titanium matrices differed significantly. The titanium matrix for the PS material
exhibited random texture pre and post fabrication of the composite. For the WD material, the starting texture of the monolithic
titanium matrix was ≈17 times random, but after consolidation into composite form, it was ≈6 times random. No significant
differences were noted in the fiber-induced matrix residual strains between the composites prepared by the two procedures.
However, the Trimarc (WD) fibers recorded higher (≈1.3 times) compressive strains than the SCS-6 (PS) fibers. Stresses and
stress balance results are reported. Plane-specific elastic moduli, measured in load tests on the unreinforced matrices, showed
little difference.
This article is based on a presentation made in the Symposium “Mechanisms and Mechanics of Composites Fracture” held October
11–15, 1998, at the TMS Fall Meeting in Rosemont, Illinois, under the auspices of the TMS-SMD/ASM-MSCTS Composite Materials
Committee. 相似文献
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P. Rangaswamy M. R. Daymond M. A. M. Bourke R. Von Dreele K. Bennett N. Jayaraman 《Metallurgical and Materials Transactions A》2000,31(13):889-898
Residual strain and texture variations were measured in two titanium matrix composites reinforced with silicon carbide fibers
(Ti/SiC) of similar composition but fabricated by different processing routes. Each composite comprised a Ti-6242 α/β matrix
alloy containing vol 35 pct continuous SiC fibers. In one, the matrix was produced by a plasma sprayed (PS) route, and in
the other by a wiredrawn (WD) process. The PS and WD composites were reinforced with SCS-6 (SiC) and Trimarc (SiC) fibers,
respectively. The texture in the titanium matrices differed significantly. The titanium matrix for the PS material exhibited
random texture pre and post fabrication of the composite. For the WD material, the starting texture of the monolithic titanium
matrix was ≈17 times random, but after consolidation into composite form, it was ≈6 times random. No significant differences
were noted in the fiber-induced matrix residual strains between the composites prepared by the two procedures. However, the
Trimarc (WD) fibers recorded higher (≈1.3 times) compressive strains than the SCS-6 (PS) fibers. Stresses and stress balance
results are reported. Plane-specific elastic moduli, measured in load tests on the unreinforced matrices, showed little difference.
This article is based on a presentation made in the Symposium “Mechanisms and Mechanics of Composites Fracture” held October
11–15, 1998, at the TMS Fall Meeting in Rosemont, Illinois, under the auspices of the TMS-SMD/ASM-MSCTS Composite Materials
Committee. 相似文献
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Administration (p.o.) of SKP-450, 2-[2"-(1",3"-dioxolane)]-2-methyl-4-(2'-oxo-1'-pyrrolidinyl)-6-nitro-2H- 1-benzopyran, a novel antihypertensive agent, to hypercholesterolemic Syrian hamsters led to a significant reduction in plasma lipids in a dose-dependent manner, i.e., a 10.8% to 29% reduction in low-density lipoprotein cholesterol at doses of 0.3 to 10 mg/kg of SKP-450. SKP-450 was found to specifically inhibit the hepatic microsomal lanosterol 14alpha-methyl demethylase (14alpha-DM) in a competitive manner (Ki:2.65 microM). Furthermore, a dose-dependent decrease in the 14alpha-DM activity by SKP-450 parallelled the cholesterol synthetic rate in vitro in both the rat hepatic S10 fractions (supernatants at 10,000 g; IC50:20 microM) and Chinese hamster ovary cells (IC50:23 microM). However, this phenomenon was not seen in AR45 cells, which are deficient in 14alpha-DM, suggesting that 14alpha-DM is the major target for the inhibitory action of SKP-450 in regard to cholesterol biosynthesis. 相似文献
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The free energies of mixing of melts in the systems 2FeO-SiO2-2MnO-SiO2 and 2.33FeO-TiO2-2.33MnOTiO2
The free energies of mixing in melts in the system 2FeO · SiO2-2MnO · SiO2 at 1450°C and the system 2.33FeO · TiO2-2.33MnO · TiO2 at 1475°C have been obtained from measurement of the equilibrium Mn + FeO = Fe + MnO established between the melts and ironmanganese
foils. Both systems exhibit ideal silicate mixing. The phase diagram for the system 2FeO-SiO2-2MnO ·SiO2 is calculated. 相似文献
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A set of benzimidazole derivatives bearing on position 2 a tetrahydropyranyl or tetrahydrofuranyl residue was prepared and tested for antitumoral, anti HIV-1 and other pharmacological activities. While the anti-HIV activity was completely lacking, moderate antitumoral activity was found in a few compounds; particularly the 5,6-dichloro-2-(tetrahydropyran-2-yl)-benzimidazole (8) was able to inhibit the growth of 19 cell lines of humane tumors at near micromolar concentration. On the other hand compounds 4, 6-8 and 10 exhibited significant tracheal relaxant activity in vitro at concentration 3-10 micrograms/ml, thus resulting superior to theophylline and comparable to amrinone. 相似文献
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A. V. Zyrin A. V. Shevchenko L. M. Lopato 《Powder Metallurgy and Metal Ceramics》2000,39(3-4):146-150
An investigation was made of the electrical properties of phases with the cubic fluorite, pyrochlor, and C-Y2O3 structures, and the tetragonal ZrO2 structure (T-ZrO2) in the ternary system ZrO2 - Y2O3 - La2O3. For comparison, the electrical conductivity of a number of specimens with the fluorite structure in the binary system ZrO2 - Y2O3 and with the pyrochlor structure in the ternary system HfO2 - Y2O3 - La2O3 was also studied. The specimens were prepared from nanocrystalline powders synthesized by the hydrolysis of zirconium salts
in an acid medium at high temperatures. Conductivity was measured over the range 300–950°C in air. It was shown that phases
with the fluorite and T-ZrO2 structures in the investigated systems possess the highest electrical conductivities.
Translated from Poroshkovaya Metallurgiya, Nos. 3/4(412), pp. 40–46, March–April, 2000. 相似文献