排序方式: 共有65条查询结果,搜索用时 15 毫秒
61.
SABER TEHRANI Mohammad RASTEGAR Faramarz PARCHEHBAF Ayob KHATAMIAN Masoomeh 《中国化学》2006,24(6):765-769
1,2-Bis(salicylidenamino)ethane loaded onto sodium dodecyl sulfate-coated alumina was used as a new chelating sorbent for the preconcentration of traces of Pb(Ⅱ) and Cu(Ⅱ) prior to atomic absorption spectrometric determination. The influence of pH, flow rates of sample and eluent solutions, and foreign ions on the recovery of Pb(Ⅱ) and Cu(Ⅱ) by this sorbent has been studied. The retained ions were eluted with 4 mol·L nitric acid and determined by electrothermal atomic absorption spectrometry (ETAAS). The data of limit of detection (3σ) for Pb(Ⅱ) and Cu(Ⅱ) were found to be 8.57 and 2.69 ng·L^-1 respectively, while the enrichment factor for both ions was 100. The proposed method was successfully applied to determination of lead and copper in different water samples. 相似文献
62.
Michael C Breadmore Wojciech Grochocki Umme Kalsoom Mnica N. Alves Sui Ching Phung Masoomeh Tehrani Rokh Joan M. Cabot Alireza Ghiasvand Feng Li Aliaa I. Shallan Aemi S. Abdul Keyon Ala A. Alhusban Hong Heng See Alain Wuethrich Mohamed Dawod Joselito P Quirino 《Electrophoresis》2019,40(1):17-39
One of the most cited limitations of capillary and microchip electrophoresis is the poor sensitivity. This review continues to update this series of biannual reviews, first published in Electrophoresis in 2007, on developments in the field of online/in‐line concentration methods in capillaries and microchips, covering the period July 2016–June 2018. It includes developments in the field of stacking, covering all methods from field‐amplified sample stacking and large‐volume sample stacking, through to isotachophoresis, dynamic pH junction, and sweeping. Attention is also given to online or in‐line extraction methods that have been used for electrophoresis. 相似文献
63.
Zakarianezhad Mohammad Makiabadi Batoul Habibi-Khorassani Sayyed Mostafa Shool Motahareh Eslamlou Masoomeh 《Research on Chemical Intermediates》2018,44(4):2653-2665
Research on Chemical Intermediates - The mechanism of the multicomponent reaction between tert-butyl isocyanide and dimethyl acetylenedicarboxylate in presence of ethanethiol and thiophenol (as... 相似文献
64.
This work includes the applications of radiation processing to decompose dimethyl phthalate (DMP) with gamma and gamma/H2O2 processes. Changes in amounts of DMP, dissolved oxygen, total acidity and formaldehyde with irradiation dose were followed. The qualitative analysis of the DMP and the intermediates were determined by using a gas chromatography combined to mass spectrometry and ion chromatography. The results indicated that degradation rate of DMP was affected by H2O2 concentration, irradiation dose and removal efficiency of 25 mg L?1 DMP can reach 100% for 1.42 kGy irradiation dose in the concentration of 4.8 mM H2O2, respectively. 相似文献
65.
Shahnaz Rostamizadeh Masoomeh Nojavan Reza Aryan Hamid Sadeghian Mahdieh Davoodnejad 《中国化学快报》2013,24(7):629-632
In this work 4-amino-6-aryl-2-phenyl pyrimidine-5-carbonitrile derivatives were synthesized through a one-pot,three-component reaction of an aldehyde,malononitrile and benzamidine hydrochloride,in the presence of magnetic nano Fe3O4 particles as a catalyst under solvent-free conditions.3-Amino-6-aryl- 2-phenylpyrazolo[3,4-d]pyrimidine derivatives were prepared through an efficient and environmentally friendly reaction between 4-amino-6-aryl-2-phenylpyrimidine-5-carbonitrile derivatives and hydrazine hydrate and their antibacterial activity has been evaluated. 相似文献