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荧光光度法测定环境水样中的苯酚和对苯二酚 总被引:7,自引:0,他引:7
建立了荧光光度法直接测定环境水样中的苯酚和对苯二酚的新方法.通过β-环糊精增敏,三维荧光扫描选择测量波长,在波长对为λex/λem=273/307 nm时测定苯酚,苯酚的线性范围为0~1×10-4 mol/L,检出限为6.6×10-8 mol/L;在波长对为λex/λem=295/331 nm时测定对苯二酚, 对苯二酚的线性范围为0~1.5×10-5 mol/L,检出限为5.2×10-9 mol/L,回收率达到93.5%~103.5%. 相似文献
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The BaO-Al2O3-B2O3 glasses manufactured for solid oxide fuel cell(SOFC) sealing were studied. The effect of different nBaO/nB2O3 on crystal, thermal properties, density and infrared spectra of this system has been discussed. The results show that the trends of crystallization, glass transformation temperature, dilatometric softening temperature and density increase with nBaO/nB2O3 values. But a typical property deviation occurs when nBaO/nB2O3 is 0.875, and its coefficient of thermal expansion has the maximum at this point. The changes of properties can attribute to the conversion of boron from tetrahedral coordination to trigonal, breakage of the local glass network and interaction between the network modifiers. These can be proved by infrared spectra of glasses. Thermal properties of some studied samples are suitable for the sealing of SOFC using Sm doped ceria electrolyte and operating at 400~600 ℃. 相似文献
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通过高温固相法制备出La_(0.8-x)Bi_xSr_(0.2)FeO_(3-δ)(LBSF)阴极粉体和铒稳定氧化铋(ESB)电解质粉体,通过XRD分别确定其成相温度以及相互之间的化学相容性;以LBSF作为阴极, ESB作为电解质,构成LBSF|ESB|LBSF对称电池,利用交流阻抗法测试阴极的极化行为;用扫描电子显微镜观察电池的断面微结构。结果表明:通过固相合成的LBSF阴极材料呈立方钙钛矿结构。在同一温度下,电导率随Bi_2O_3的掺杂量增加而降低;但极化阻抗随着Bi_2O_3的掺杂量增加而降低,当x=0.4时, LBSF(0.4)的极化阻抗达到最小, 650℃时为1.05Ω·cm~2, 900℃时低达0.17Ω·cm~2。研究结果表明:LBSF是良好的固体氧化物燃料电池阴极材料。 相似文献
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