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人工神经网络光致发光法同时测定α-萘乙酸和吲哚-3-乙酸 总被引:1,自引:0,他引:1
研究了酸度、有机溶剂、重原子效应和共存物对α-萘乙酸(NAA)及吲哚-3-乙酸(IAA)光致发光性质的影响,建立了人工神经网络不经分离同时测定NAA和IAA的新方法。该法测定NAA和IAA的线性范围分别是0.012~0.24 mg.L-1和0.0034~0.068 mg.L-1(荧光)0、.18~1.8 mg.L-1和0.18~1.8 mg.L-1(燐光),检出限分别为0.0039 mg.L-1和0.0019 mg.L-1(荧光)0、.14 mg.L-1和0.13 mg.L-1(燐光)。方法用于合成样和水样测定,回收率在93%~109%之间,结果满意。 相似文献
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A novel holmium complex [Ho(HIA)_2(H_2O)_4(NO_3)](NO_3)_2(1, HIA = isonicotinic acid) has been synthesized through hydrothermal reactions and characterized by single-crystal X-ray diffraction. Complex 1 crystallizes in the C2/c space group of monoclinic system: a = 14.4797(7), b = 12.4768(2), c = 13.3471(5) ?, β = 118.690(4)°, V = 2115.26(13) ?~3, C_(12)H_(16)HoN_5O_(17), Mr = 667.23, Z = 4, Dc = 2.095 g/cm~3, μ(Mo Kα) = 3.838 mm~(–1) and F(000) = 1304. The crystal structure of 1 is characterized by an isolated structure. Solid-state photoluminescence experiment uncovers that it shows yellow light emission. The emission bands are originated from the characteristic emission of the 4 f electrons intrashell transition of the ~5S_2 → ~5I_8 and ~5F_5 → ~5I_8 of the Ho~(3+) ions. Energy transfer mechanism is explained by the energy level diagram of the Ho3+ ion and the isonicotinic acid ligand. It has remarkable CIE chromaticity coordinates of(0.4929, 0.4632), so it may be a promising color converter for lighting and displays. 相似文献
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甲基三氯硅烷——甲基三乙氧基硅烷二元体系等压汽液平衡研究 总被引:2,自引:0,他引:2
利用新型泵式沸点仪,在101.3kPa下测定了甲基三氯硅烷-甲基三乙氧基硅烷二元体系汽液平衡数据,对甲基三乙氧基硅烷的临界性质进行了估算,分别用Wilson,NRTL,Margules,Van Laar四种模型对所测数据进行了关联,结果令人满意。 相似文献
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利用新型泵式沸点仪,在101.3kPa下测定了甲基二氯硅烷-甲基乙烯基二氯硅烷二元体系液相平衡数据,同时,对甲基乙烯基二氯硅烷的临界性质进行了估算。分别用Margules,VanLaar,Wilson和NRTL模型进行了关联,结果令人满意。 相似文献
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Two new zinc bipyridinium compounds, [N-ethyl-4,4′-bipyridinium][ZnX4](X = Cl(1) or Br(2)) with N-ethyl-4,4′-bipyridinium generated in situ, have been synthesized through solvothermal reactions and structurally characterized by single-crystal X-ray diffraction analyses. Both compounds are isostructural and crystallize in the P21/c space group of monoclinic system. Compound 1: a = 8.4397(5), b = 21.988(1), c = 8.8777(5) , β = 106.490(1)°, V = 1579.7(2) 3, C12H15Cl4N2 Zn, Mr = 394.43, Z = 4, Dc = 1.658 g/cm3, S = 1.068, μ(MoKα) = 2.218 mm-1, F(000) = 796, R = 0.0295 and wR = 0.0766. Compound 2: a = 8.4154(6), b = 22.844(2), c = 9.0308(7) , β = 106.026(1)°, V = 1668.6(2) 3, C12H15Br4N2 Zn, Mr = 572.27, Z = 4, Dc = 2.278 g/cm3, S = 1.033, μ(MoKα) = 11.038 mm-1, F(000) = 1084, R = 0.0427 and wR = 0.1175. Both of them are characteristic of an isolated structure with the zinc atoms locating at a tetrahedral environment. In both compounds, the N-ethyl-4,4′-bipyridinium2+ cations and ZnX42– anions interconnect together via hydrogen bonding interactions to construct a three-dimensional(3-D) supramolecular framework. Fluorescent studies reveal that both compounds exhibit a strong emission in the green region. In combination with the theoretical calculations, we can draw a conclusion that the emissions should result from ligand-toligand charge-transfer(LLCT) transition. 相似文献
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提出了一种基于乙醇-电解质-水体系双水相萃取、固体基质室温燐光法(SS-RTP)测定色氨酸的新方法:将适量电解质和乙醇加入试液中,离心后用SS-RTP测定上相中的色氨酸.在最佳萃取体系乙醇-K2HPO4-KH2PO4-H2O中,测定色氨酸的线性范围1.0×10-7~2.0×10-6mol/L、检出限5.4×10-9mol/L(S/N=3).用于大豆、大米、玉米和竹笋中色氨酸的测定,相对标准偏差2.2%~3.3%,与荧光法比较,相对误差-3.3%~3.2%. 相似文献
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建立高效液相色谱法同时测定化妆品的巴豆苷、苦杏仁苷、花椒毒素、狼毒乙素、马兜铃酸、欧前胡素、土木香内酯7种化合物。采用资生堂CAPCELL PAK MG C18柱(250 mm×4.6 mm,5μm),以乙腈-0.05%磷酸为流动相梯度洗脱,流量为1 mL/min,进样体积为10μL,柱温为30℃,采用二极管阵列检测器,在210 nm波长处测定。7种化合物在所测浓度范围内有良好的线性关系,相关系数均大于0.999,平均回收率为90.0%~105.0%,测定结果的相对标准偏差为0.3%~2.8%(n=6),方法检出限为0.02~0.17μg/g。该方法可以高效、准确的检测化妆品中7种禁用植物原料的标志性成分。 相似文献
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研究了三乙醇胺(TEA)水溶液在电解质作用下的相分离及其通过形成TEA-Fe3+配合物实现三乙醇胺相对Fe3+的萃取,萃取过程将萃取剂和萃取溶剂合二为一。同时还讨论了表面张力、溶液提升率对火焰原子吸收光谱法(FAAS)测定三乙醇胺相中铁的影响。建立了TEA-K2HPO4-H2O双水相萃取、FAAS测定铁的新方法:在试液中加入1 mL三乙醇胺(1+1)和5 g K2HPO4后以水定容为10 mL,离心分离后用FAAS测定三乙醇胺相中的铁。线性范围20~240μg/L,检出限6.1μg/L(S/N=3),已用于自来水和井水中铁的萃取。 相似文献