【摘 要】
：
Dispersive liquid-liquid microextraction technique was introducd to remove the centrifuging step and conduct inclusion microextraction of charged porphyrins by
【机 构】
：
Razi Chemistry Research Center(RCRC)
论文部分内容阅读
Dispersive liquid-liquid microextraction technique was introducd to remove the centrifuging step and conduct inclusion microextraction of charged porphyrins by nano-baskets.For nano-baskets ofp-tert-calix[4]arene bearing di-[N-(X)sulfonyl carboxamide] and di-(1-propoxy) in ortho-cone conformation was synthesized and used.The related parameters including ligand concentration,the volume of water disperser,salt effect,and extraction time were optimized.The linear range,detection limit(S/N=3) and precision(RSD,n=6) were determined to be 0.2-50,0.07 μg/L and 5.3％,respectively.The results reveal that the new approach is competitive analytical tool and an alternative of the traditional methods in the crude oil and related systems.
其他文献
Vanadium extraction from stone-coal was investigated by oxygen pressure acid leaching and solvent extraction. The mineralogy of the stone-coal from Tongren City
以提高灰色系统预测模型对随机振荡序列的预测精度为目的,提出了一种通过平滑性算子压缩随机振荡序列振幅,提高序列光滑度的算法,并在此基础上推导及建立随机振荡序列的灰色
针对传统缓冲算子不能实现作用强度的微调，从而导致缓冲作用效果过强或过弱的问题，构造了调和变权弱化缓）中算子（VWHWBO）和调和变权强化缓冲算子（VWHSBO），研究了该类缓冲算子调节度与
激光或单色光(LI)对生物系统存在光生物调节作用(PBM)。II与细胞分子的量子力学相互作用决定了PBM的剂量关系。低强度LI(LIL)(～10 mW/cm~2)的PBM主要由状态依赖的视觉外光信号
To say that medicine is not knowledge or skill is apparently a contradiction.But to say that medicine is merely knowledge and skill is also off the mark.The fam
#SAT问题是SAT问题的扩展,需要计算出给定命题公式集合的模型个数.通过将问题求解沿着归结的反方向进行,并利用容斥原理解决由此带来的空间复杂性问题,提出了一种基于扩展规
Common variable immunodeficiency (CVID) is a rare disease characterized by recurrent pulmonary infections, hypogammaglobulinemia, and diminished specific a
针对复杂背景图像中的文本抽取问题,文中提出一种基于条件随机场的图像文本抽取方法.该方法在将各种特征有效结合起来的同时,考虑到上下文特征,从而能有效地从复杂图像中抽取文本信息.分析比较不同颜色空间、不同特征对文本抽取性能的影响.实验结果表明该方法的有效性.
依存语法中由于缺乏对句法功能结构的描述机制,不能显性表达某些复杂的句法结构.修饰词的嵌套层次虽是语用学的常识,却极少有语法分析模型考虑该信息.针对这两个问题,文中提
D-S证据理论可以有效表示随机性和模糊性的不确定信息,可以在不需要先验信息的情况下对证据进行组合,这些优点使得该理论被广泛应用于信息融合的各个领域。但是在实际应用中,