Determination of inorganic acids by ion chromatography with n -tetradecylphosphocholine (zwitterionic surfactant) as the stationary phase and pure water as the mobile phase

2001 ◽  
Vol 370 (4) ◽  
pp. 399-402 ◽  
Author(s):  
Wenzhi Hu ◽  
Kiyoshi Hasebe ◽  
Kazuhiko Tanaka ◽  
James S. Fritz ◽  
Soichi Inoue ◽  
...  
Keyword(s):  
Stationary Phase ◽  
Ion Chromatography ◽  
Mobile Phase ◽  
Pure Water ◽  
Zwitterionic Surfactant ◽  
Inorganic Acids

Direct determination of bromide ions in sea water by ion chromatography using water as the mobile phase

1996 ◽  
Vol 322 (1-2) ◽  
pp. 43-47 ◽  
Author(s):  
Hu Wenzhi ◽  
Cao Shun-an ◽  
Mamoru Tominaga ◽  
Akira Miyazaki
Keyword(s):  
Ion Chromatography ◽  
Mobile Phase ◽  
Sea Water ◽  
Direct Determination ◽  
Bromide Ions

scholarly journals Derivatization Ion Chromatography for the Determination of Monoethanolamine in Presence of Hydrazine in PHWR Steam-Water Circuits

2011 ◽  
Vol 2011 ◽  
pp. 1-5
Author(s):  
Ayushi D. ◽  
Arijit Sengupta ◽  
Sangita D. Kumar ◽  
A. G. Kumbhar ◽  
G. Venkateswaran
Keyword(s):  
Ion Chromatography ◽  
Mobile Phase ◽  
Limit Of Detection ◽  
Accurate Method ◽  
Feed Water ◽  
Relative Standard ◽  
Conductometric Detection ◽  
Mode A ◽  
Eluent Acetone

A simple, rapid and accurate method for the determination of monoethanolamine (MEA) in PHWR steam-water circuits has been developed. MEA is added in the feed water to provide protection against corrosion while hydrazine is added to scavenge dissolved oxygen. The quantitative determination of MEA in presence of hydrazine was accomplished using derivatization ion chromatography with conductometric detection in nonsuppressed mode. A Metrosep cation 1-2 analytical column and a Metrosep cartridge were used for cation separation. A mixture of 4 mM tartaric acid, 20% acetone and 0.05 mM HNO3was used as eluent. Acetone in the mobile phase leads to the formation of different derivatives with MEA and hydrazine. The interferences due Na+and NH4 +were eliminated by adopting a simple pretreatment procedure employing OnGuard-H cartridge. The limit of detection limit of MEA was 0.1 μg mL−1and the relative standard deviation was 2% for the overall method. The recovery of MEA added was in the range 95%–102%. The method was applied to the determination of MEA in steam generator water samples.

Determination of atmospheric alkylamines by ion chromatography using 18-crown-6 as mobile phase additive

2018 ◽  
Vol 1563 ◽  
pp. 154-161 ◽  
Author(s):  
Shengqian Zhou ◽  
Jing Lin ◽  
Xiaofei Qin ◽  
Ying Chen ◽  
Congrui Deng
Keyword(s):  
Ion Chromatography ◽  
Mobile Phase ◽  
Mobile Phase Additive

scholarly journals Determination of New Antidepressants in Pharmaceuticals by Thin-Layer Chromatography with Densitometry

2010 ◽  
Vol 93 (3) ◽  
pp. 778-782 ◽  
Author(s):  
Tatána Gondová ◽  
Iveta Petríková
Keyword(s):  
Thin Layer ◽  
Stationary Phase ◽  
Thin Layer Chromatography ◽  
Mobile Phase ◽  
Pharmaceutical Formulations ◽  
Simultaneous Separation ◽  
Tlc Plates ◽  
Precision And Accuracy ◽  
Layer Chromatography

Abstract A new and simple TLC-densitometry method has been developed for the simultaneous separation of the two noradrenergic and specific serotonergic antidepressants mirtazapine and mianserine and validated for their determination in commercially available tablets. The method used TLC plates precoated with silica gel 60F254 as the stationary phase, and the mobile phase consisted of hexaneisopropanol25 ammonia (70 + 25 + 5, v/v/v). Densitometric analysis was carried out in the absorbance mode at 280 nm. The method was validated in accordance with International Conference on Harmonization guidelines in terms of linearity, LOD, LOQ, precision, and accuracy. Calibration curves were linear (R2 > 0.9970) with respect to peak area in the concentration range of 5002500 and 5005000 ng/spot for mirtazapine and mianserine, respectively. The LODs were 20 and 35 ng/spot for mirtazapine and mianserine, respectively. The described method was successfully applied to the determination of mirtazapine and mianserine in their pharmaceutical formulations with recovery ranging from 99.83 to 101.20 of the labeled amount of the compounds. The proposed method can be used in routine QC of these drugs in pharmaceutical formulations.

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