ZrC-桑色素络合物在碳糊电极上的二次导数吸附伏安法测定Zr的研究

研究了Zr 桑色素络合物在碳糊电极正电位区的吸附伏安行为 ,并利用其在 0 .74V处的二次导数吸附氧化峰电流与Zr(Ⅳ )浓度为 6 .0× 10 -9～ 2 .0× 10 -6mol/L呈线性而测定Zr;检出限为 3.0× 10 -9mol/L(S/N =3)。最佳测定条件为 :2 .0mol/LHCl、1.0× 10 -5mol/L桑色素 ;富集电位为 0V(vs .SCE) ;扫描速度为2 5 0mV/s。该法不需萃取分离 ,可直接用于岩石样品中Zr的测定 。

二次导数极谱法测定工作液中2-乙基蒽醌和四氢-2-乙基蒽醌含量

建立了采用二次导数极谱法测定蒽醌法生产过氧化氢用钯催化剂选择性评价工作液中2-乙基蒽醌(EAQ)和四氢-2-乙基蒽醌(H4EAQ)含量的方法。克服了常规极谱法测定EAQ和H4EAQ含量时分辨率低、误差大等局限性,可使EAQ和H4EAQ的极谱波清晰地分离;并通过加入适量的除氧剂,有效消除了氧波对波形的干扰,改善了波形,并抑制了极谱极大峰的出现,实现了对工作液中EAQ和H4EAQ含量的准确测定。该法测定EAQ和H4EAQ的相对误差分别为+4.6%和+4.3%,相对标准偏差分别为2.1%和1.7%,检出限分别为4.1 mg/L和1.7 mg/L。

岩土工程渗流参数反问题

系统介绍了目前国内外岩土工程渗流参数反问题研究的现状和进展,对参数辨识不适定性等问题做了讨论,并结合计算实践着重对几种典型求解方法的优缺点进行了比较和评述。对今后岩土工程渗流反问题研究提出了初浅的看法。

Least Squares Spectral Analysis and Its Application to Superconducting Gravimeter Data Analysis

Detection of a periodic signal hidden in noise is the goal of Superconducting Gravimeter (SG) data analysis. Due to spikes, gaps, datum shrifts (offsets) and other disturbances, the traditional FFT method shows inherent limitations. Instead, the least squares spectral analysis (LSSA) has showed itself more suitable than Fourier analysis of gappy, unequally spaced and unequally weighted data series in a variety of applications in geodesy and geophysics. This paper reviews the principle of LSSA and gives a possible strategy for the analysis of time series obtained from the Canadian Superconducting Gravimeter Installation (CGSI), with gaps, offsets, unequal sampling decimation of the data and unequally weighted data points.