scholarly journals A Spectrophotometric Flow Injection Method for Determination of Ultratrace Amounts of Phenylhydrazine by Its Inhibition Effect on the Reaction of Thionin and Nitrite

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
M. Keyvanfard ◽  
Kh. Alizad
Keyword(s):  
Sulfuric Acid ◽  
Flow Injection ◽  
Sodium Nitrite ◽  
Calibration Graph ◽  
Optimum Conditions ◽  
Linear Calibration ◽  
Inhibition Effect ◽  
Colorimetric Procedure ◽  
Simple Flow

A simple flow injection colorimetric procedure for determining phenylhydrazine was established. It is based on the reaction of phenylhydrazine in sulfuric acid with thionin and sodium nitrite. Reaction was monitored spectrophotometrically by measuring thionin absorbance atλmax=602 nm. A standard or sample solution was injected into the sulfuric acid stream, which was then merged with sodium nitrite stream and thionin stream. Optimum conditions for determining phenylhydrazine were investigated by univariate method. Under the optimum conditions, a linear calibration graph was obtained over the range 0.05–0.60 μmol L−1, and the detection limit was 0.027 μmol L−1(s/n=3). The proposed method has been satisfactorily applied to the determination of phenylhydrazine in human serum and water samples.

Rapid Determination of Sulfite by Flow Injection Analysis Based on Fuchsin′s Addition

2013 ◽  
Vol 295-298 ◽  
pp. 950-953 ◽  
Author(s):  
Dong Yuan ◽  
Da You Fu ◽  
Wen Yuan Tan
Keyword(s):  
Flow Injection ◽  
Addition Reaction ◽  
Rapid Determination ◽  
Sampling Rate ◽  
Optimum Conditions ◽  
Linear Calibration ◽  
Relative Standard ◽  
Replicate Measurements ◽  
Good Agreement

A rapid spectrophotometric method for flow injection determination of sulfite in tan wastewater is described. The proposed method was based on the addition reaction of sulfite with fuchsin in Na2B4O7-NaOH medium. The optimum conditions allow a linear calibration range of 0.01-1.20 μg ml-1 SO32-. The detection limit is 0.0023μg ml-1 (S/N=3), and the relative standard deviation for night replicate measurements is 1.1% for 0.5μg ml-1 of sulfite. The sampling rate is 60 samples h-1. The procedure has been applied to the determination of sulfite in tan wastewater. The results were in good agreement with those obtained by pararosaniline method.

Determination of Trace Chromium (VI) in Tanning Wastewater by Flow Injection Spectrophotometry

2010 ◽  
Vol 113-116 ◽  
pp. 1732-1734
Author(s):  
Xin Zhao ◽  
Zhi Hui Sui ◽  
Jing Bin Zhang
Keyword(s):  
Standard Deviation ◽  
Relative Standard Deviation ◽  
Flow Injection ◽  
Spectrophotometric Method ◽  
H2so4 Solution ◽  
Optimum Conditions ◽  
Chromium Vi ◽  
Relative Standard ◽  
Simple Flow

In 1.0 mol/L H2SO4 solution, a rapid and simple flow—injection spectrophotometric method has been developed for Cr(Ⅵ) determination, based on the violet—red Cr(Ⅵ)—diphenylcarbazide chelates formed by reactions. The results show, under optimum conditions, the maximum absorption of the complex is at 540 nm and the detection limits of the method is 0.0136mg/L for Cr(Ⅵ) and Beer’s law is obeyed for Cr(Ⅵ) in the range of 0.03—1.60mg/L. The determination frequency is l00 times/h. The relative standard deviation of eleven replicates is less than 4.0%. The method has been applied to the determination of trace Cr(Ⅵ) in tanning wastewater with satisfactory results.

Flow-Injection Chemiluminescence Method for the Determination of Hydrocortisone and Progesterone

1997 ◽  
Vol 51 (10) ◽  
pp. 1484-1487 ◽  
Author(s):  
Huai-Na Li ◽  
Yun-Xing Ci
Keyword(s):  
Sulfuric Acid ◽  
Reaction Mechanism ◽  
Flow Injection ◽  
Chemiluminescence Method ◽  
Experimental Conditions ◽  
Mercapto Group ◽  
Sensitizing Effect ◽  
Flow Injection Chemiluminescence ◽  
Simple Flow

A simple flow injection chemiluminescence (CL) method for the determination of progesterone and hydrocortisones (HCRs) is described. The method is based on their sensitizing effect on the chemiluminescence reaction of a mercapto-group (-SH) with cerium(IV) in sulfuric acid. This method allows determination in the ranges 0.28–8.0 μg/mL for hydrocortisones (HCRs) and 0.5–8.0 μg/mL for progesterone with a detection limit of 0.10 μg/mL for HCRs and 0.26 μg/mL for progesterone. The experimental conditions for the reaction are optimized. The possible reaction mechanism is discussed.

Separation and Determination of Some Aromatic Sulfones by Reversed-Phase High-Performance Liquid Chromatography

1994 ◽  
Vol 59 (3) ◽  
pp. 569-574 ◽  
Author(s):  
Josef Královský ◽  
Marta Kalhousová ◽  
Petr Šlosar
Keyword(s):  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
Mobile Phase ◽  
High Performance ◽  
Reversed Phase ◽  
Uv Spectra ◽  
Optimum Conditions ◽  
Linear Calibration ◽  
Technical Grade

The reversed-phase high-performance liquid chromatography of some selected, industrially important aromatic sulfones has been investigated. The chromatographic behaviour of three groups of aromatic sulfones has been studied. The optimum conditions of separation and UV spectra of the sulfones and some of their hydroxy and benzyloxy derivatives are presented. The dependences of capacity factors vs methanol content in mobile phase are mentioned. The results obtained have been applied to the quantitative analysis of different technical-grade samples and isomer mixtures. For all the separation methods mentioned the concentration ranges of linear calibration curves have been determined.

scholarly journals Flow injection analysis of water. Part 1: Automatic preconcentration determination of sulphate, ammonia and iron(II)/iron(III)

1993 ◽  
Vol 15 (4) ◽  
pp. 141-146 ◽  
Author(s):  
J. S. Cosano ◽  
M. D. Luque de Castro ◽  
M. Valcárcel
Keyword(s):  
Flow Injection ◽  
Good Reproducibility ◽  
Chemical Systems ◽  
Sequential Determination ◽  
On Line ◽  
Exchange Material ◽  
Iron Complexation ◽  
Simple Flow ◽  
Ammonia Formation

This paper describes a simple flow-injection (FI) manifold for the determination of a variety of species in industrial water. The chemical systems involved in the determination of ammonia (formation of Indophenol Blue), sulfate (precipitation with Ba(II)), and iron (complexation with 1,10-phenanthroline with the help of a prior redox reaction for speciation) were selected so that a common manifold could be used for the sequential determination of batches of each analyte. A microcolumn of a suitable ion exchange material was used for on-line preconcentration of each analyte prior to injection; linear ranges for the determination of the analytes at the ng/ml levels were obtained with good reproducibility. The manifold and methods are ready for full automation.

Determination of lead in whole blood with a simple flow-injection system and computerized stripping potentiometry

1988 ◽  
Vol 209 ◽  
pp. 339-343 ◽  
Author(s):  
L. Almestrand ◽  
M. Betti ◽  
Chi Hua ◽  
D. Jagner ◽  
L. Renman
Keyword(s):  
Flow Injection ◽  
Whole Blood ◽  
Injection System ◽  
Flow Injection System ◽  
Simple Flow

scholarly journals A Highly Sensitive Spectrofluorometric Method for the Determination of a New Antidepressant Drug, Reboxetine, in Tablets

2006 ◽  
Vol 89 (4) ◽  
pp. 972-975 ◽  
Author(s):  
ArmaĞan Önal
Keyword(s):  
Antidepressant Drug ◽  
Fluorescence Emission ◽  
Calibration Graph ◽  
Control Analysis ◽  
Optimum Conditions ◽  
Highly Sensitive ◽  
Relative Standard ◽  
Spectrofluorometric Method ◽  
Interday Precision

Abstract A highly sensitive, selective, and rapid spectrofluorometric method has been developed for the determination of reboxetine (REB) in tablets. The method is based on derivatization with 7-chloro-4-nitrobenzofurazan. The product showed an absorption maximum at 476 nm and a fluorescence emission peak at 533 nm in ethyl acetate. The optimum conditions of the reaction were investigated, and it was found that the reaction proceeded quantitatively at pH 8.5, 70C in 5 min. The calibration graph is rectilinear over the range of 0.02-0.40 μg/mL. The relative standard deviation values for intraday and interday precision were 0.40-0.93 and 0.54-1.37%, respectively. The proposed method was applied to the assay of REB in tablets. Mean recovery of REB from the tablets ranged between 99.91-100.20%. The results were compared statistically with those obtained by a method reported in the literature. The method is sensitive, simple, and selective, and can be used for routine quality control analysis.

scholarly journals A Simple Flow Injection Spectrophotometric Determination of Nitrite Based on Its Reaction with Thiourea

2005 ◽  
Vol 21 (6) ◽  
pp. 661-665 ◽  
Author(s):  
Mohammad POURHOSSEIN ◽  
Mohammad K. AMINI ◽  
Morteza TALEBI
Keyword(s):  
Spectrophotometric Determination ◽  
Flow Injection ◽  
Simple Flow

A method of high sensitivity and in situ determination of trace cobalt(II) in water samples with salicyl fluorone

2014 ◽  
Vol 70 (7) ◽  
pp. 1182-1187 ◽  
Author(s):  
Zhe Chen ◽  
Hua Li
Keyword(s):  
Flow Injection ◽  
Water Samples ◽  
High Sensitivity ◽  
Basic Solution ◽  
Optimum Conditions ◽  
Cetylpyridinium Bromide ◽  
Test Conditions ◽  
Relative Standard

Based on the sensitive reaction of Co(II) and salicyl fluorone with the presence of cetylpyridinium bromide in basic solution, a new method of flow injection micelle-solubilized spectrophotometry was developed for the determination of cobalt. The reaction was monitored for the absorbance of Co(II) at 540 nm. The reagents, flow injection variables and effects of foreign ions were investigated and the optimum conditions were established. At the optimum test conditions, the developed method provides a linearity range of 3–40 μg L−1 with a detection limit of 0.1 μg L−1 at about 60 h−1 sampling frequency. Relative standard deviation of 0.91, 0.95 and 0.89% were obtained for the determination of 3, 15 and 30 μg L−1 Co(II) solution. The proposed method has been successfully applied for analysis of trace amounts of cobalt in water samples.

Sign in / Sign up

Export Citation Format

Share Document