Microflow injection chemiluminescence system with spiral microchannel for the determination of cisplatin in human serum

A new microflow injection chemiluminescence (μFI-CL) system was described for the determination of cisplatin in human serum. By using the microchip with double spiral channel configuration, the sensitivity was greatly enhanced due to more efficient mixing of the analyte and reagent solutions. Experimental results revealed that common ions in human serum, such as Mn²⁺, Co²⁺, Fe³⁺, Cu²⁺, Zn²⁺, Ni²⁺, Na⁺, K⁺, Ca²⁺, Cl⁻, NO₃⁻, Ac⁻, CO₃²⁻, PO₄³⁻, SO₄²⁻ did not cause interference with the detection of Pt(II) by using 1,10-phenanthroline as the masking agent. Under the optimized conditions, a linear calibration curve (R² = 0.998) over the range 2.0 × 10⁻⁸ to 2.0 × 10⁻⁶ mol L⁻¹ was obtained with the detection limit of 1.24 × 10⁻⁹ mol L⁻¹. The relative standard deviation was found to be 3.46% (n = 12) for 2.0 × 10⁻⁷ mol L⁻¹. The sample consumption was only 2 μL with the sample throughput of 72 h⁻¹. It had been used for trace platinum determination in cisplatin injection and human serum samples after the dosage of cisplatin. The recovery varied from 97.6 to 103.9%. The results proved that the proposed μFI-CL system had the advantages of high sensitivity and precision, low sample and reagents consumption, and high analytical throughput.     

Complexes between HC1 and proton acceptors in gas and low temperature argon matrices

FT-IR spectra of mixtures of HC1 and various proton acceptors have been recorded in the gas phase and the enhancement gradient of theP(1) HC1 band with pressure of added gas measured. Bands arising from other collisions to form complexes with longer lifetimes were also measured in the gas and matrix phases. The two kinds of interactions are correlated with proton affinity and dipole moment of added gas.     

Structural and Spectroscopic Properties of Linear Carbon Chains NC2nN and HC2n+1N (n = 1～10)

Using density functional theory, geometries and vibrational frequencies of linear chains NC2nN and HC2n+1N (n = 1～ 10) have been investigated.Time-dependent density functional theory (TD-DFT) has been used to calculate the vertical transition energies and oscillator strengths for the X 1∑+k → 11∑+u transition in NC2nN (n = 1 ～10) and X1∑+ → 11∑+ transition in HC2n+1N (n =1 ～7).On the basis of present calculations, the explicit expressions for the size dependence of the excitation energy and the first adiabatic ionization energy in both carbon chains have been suggested.     

The evaluation of time variation global warming effects, TWPA and CWP, for CFC alternatives

Evaluations methods of global warming are presented by considering the direct warming effect of chemical compounds and of decomposed compounds, warming effect due to the formation of troposphere ozone, and the cooling effect due to the decomposition of stratosphere ozone. It is easy to take account the stabilization of global warming gases concentration in the atmosphere, as those methods can conduct the time variations analysis. The methods are named Total Warming Prediction Analysis (TWPA) and Composite Warming Potential (CWP). The evaluation of Mobile Air Conditioning refrigerant is presented as an example of application of our method.     

Investigation on liquid chromatographic separation of basic compounds using silica column with aqueous/organic mobile phase containing triethylamine and acetic acid

A high-performance liquid chromatography (HPLC) method using silica column eluted with aqueous solvent mobile phase containing triethylamine (TEA) and acetic acid (ACH) at trace percentages was characterized for the analysis of basic compounds. The key mechanism of this system is ion-exchange accompanying interaction of silanol groups. The increase in the ACH concentration in the mobile phase minimizes the ionization of the silanol group, leading to reduced retention time. However, the greater extent of ionization of silanol caused by the increase of TEA concentration helps to retain basic compounds in the column. Further, the protonated TEA that is positively charged also competes for the ionized silanol group with basic compounds, resulting in the modification of retention time. On the other hand, the retention becomes longer with increasing proportion of either organic or aqueous solvent in mobile phase, and partial replacement of methanol with acetonitrile.     

退火温度对混合阳离子钙钛矿太阳能电池性能的影响

通过不断降低钙钛矿的带隙,拓宽光活性层的光吸收范围是提高钙钛矿太阳能电池光电转换效率的一个有效途径.本文通过在三碘亚铅酸甲脒(HC(NH2)2PbI3简称FAPbI3)前驱液中混入一定比例的碘化甲铵(CH3NH3I简称MAI)并将其退火温度从150 ℃降低到100 ℃,不仅能有效改善钙钛矿薄膜的表面形貌和结晶度,还能得到比三碘亚铅酸甲铵(CH3NH3PbI3简称MAPbI3)更窄带隙的薄膜,由此得到效率达14.8;钙钛矿太阳能电池器件.     

基于参数连续HC Bézier-like曲线的过渡曲线的构造

在形状调配过程中,过渡曲线的连续性往往是很难保证的.给出HC Bézier-like曲线的定义,然后从过渡曲线满足一定连续性的角度出发,利用HC Bézier-like曲线的端点性质,研究形状参数曲线的参数连续特征保持问题.给出线性混合过程中,一阶和二阶参数连续保持条件,从而得出一般的HC Bézier-like曲线在...