scholarly journals On-Line Preconcentration and Simultaneous Determination of Cu and Mn in Water Samples Using a Minicolumn Packed with Sisal Fiber by MIP OES

Molecules ◽  
2021 ◽  
Vol 26 (6) ◽  
pp. 1662
Author(s):  
Javier Silva ◽  
Mariela Pistón
Keyword(s):  
Simultaneous Determination ◽  
Water Samples ◽  
Sampling Rate ◽  
Injection System ◽  
Sisal Fiber ◽  
Relative Standard ◽  
On Line ◽  
Preconcentration Time ◽  
Mip Oes

An on-line preconcentration system for the simultaneous determination of Copper (Cu) and manganese (Mn) in water samples was developed and coupled to a microwave-induced plasma optical emission spectrometer (MIP OES). The flow injection system was designed with a minicolumn packed with sisal fiber (Agave sisalana). A multivariate experimental design was performed to evaluate the influence of pH, preconcentration time, and eluent concentration. Optimal conditions for sample preparation were pH 5.5, preconcentration time was 90 s, and HCl 0.5 mol L−1 was the eluent. The main figures of merit were detection limits 3.7 and 9.0 µg L−1 for Cu and Mn, respectively. Precision was expressed as a relative standard deviation better than 10%. Accuracy was evaluated via spiked recovery assays with recoveries between 75–125%. The enrichment factor was 30 for both analytes. These results were adequate for water samples analysis for monitoring purposes. The preconcentration system was coupled and synchronized with the MIP OES nebulizer to allow simultaneous determination of Cu and Mn as a novel sample introduction strategy. The sampling rate was 20 samples/h. Sisal fiber resulted an economical biosorbent for trace element preconcentration without extra derivatization steps and with an awfully time of use without replacement complying with the principles of green analytical methods.

Sensitive quantification of trace zinc in water samples by adsorptive stripping voltammetry

2013 ◽  
Vol 69 (2) ◽  
pp. 438-442 ◽  
Author(s):  
Shahryar Abbasi ◽  
Abbas Farmany ◽  
Mahmoud Roushani ◽  
Seyede Shima Mortazavi
Keyword(s):  
Water Samples ◽  
Mineral Water ◽  
Stripping Voltammetry ◽  
Adsorptive Stripping Voltammetry ◽  
Complexing Agent ◽  
Peak Current ◽  
Relative Standard ◽  
Preconcentration Time ◽  
Influence Of Ph

A simple and sensitive adsorptive stripping voltammetry method was developed for determination of Zn using N-nitrozo-N-phenylhydroxylamine (cupferron) as a selective complexing agent. This complex absorbed on the hanging mercury drop electrode and created a sensitive peak current. The peak current and concentration of zinc accorded with a linear relationship in the range of 0.85–320 ng mL−1. The influence of pH and the nature of supporting electrolytes, concentration of ligand, preconcentration time and applied potential were investigated. The relative standard deviation at a concentration level of 50 ng mL−1 was 1.8%. The method was applied to the determination of zinc in city, river and mineral water samples, with satisfactory results.

scholarly journals Spectrophotometric flow injection system for determination of Zn2+ in ophthalmic formulations using Alizarin red S

2018 ◽  
Vol 34 (2) ◽  
pp. 67
Author(s):  
Orlando Fatibello-Filho ◽  
Heberth Juliano Vieira
Keyword(s):  
Flow Injection ◽  
Sampling Rate ◽  
Alizarin Red S ◽  
Injection System ◽  
Borate Buffer Solution ◽  
Buffer Solution ◽  
Solution Ph ◽  
Alizarin Red ◽  
Relative Standard

A spectrophotometric flow injection method for the determination of Zn(II) in ophthalmic formulations was developed. In this work, Zn(II) ion was complexed with Alizarin red S in borate buffer solution (pH 9.0) and the chromophore produced was monitored at 520 nm. The analytical curve was linear in the Zn(II) concentration range from 6.05 x 10-6 to 1.50 x 10-4 mol L-1 with a detection limit of 3.60 x 10-6 mol L-1. Recoveries ranged from 96.3 to 105 % and a relative standard deviation of 1.2 % (n = 10) for 5.5x10-5 mol L-1 Zn(II) reference solution were obtained. The sampling rate was 60 h-1 and the results obtained of Zn(II) in ophthalmic products using this procedure are in close agreement with those obtained using a comparative spectrophotometric procedure at 95 % confidence level.

scholarly journals A fully automated flow injection atomic absorption system for the determination of copper traces in waters with on-line pre-concentration in an ion-exchange column

1995 ◽  
Vol 17 (1) ◽  
pp. 25-29 ◽  
Author(s):  
J. L. Burguera ◽  
M. Burguera ◽  
P. Carrero ◽  
J. Marcano ◽  
C. Rivas ◽  
...  
Keyword(s):  
Atomic Absorption Spectrometry ◽  
Atomic Absorption ◽  
Flow Injection ◽  
Water Samples ◽  
Absorption Spectrometry ◽  
Linear Calibration ◽  
Relative Standard ◽  
On Line ◽  
Determination Of Copper

The paper describes the development of an automatic on-line column pre-concentration technique using a time based-flow injection atomic absorption spectrometry system. A manifold incorporating a micro-column containing 25 mg of Dowex 50W-X8 was used with a time-based injector for the pre-concentration and determination of copper in natural and drinking waters. The system features depend on the alternate positions of a solenoid valve. The 3σ detection limits, enrichment factors, sampling frequency, relative standard deviations and linear calibration graphs were, respectively, in the range 0.6-1.5 μg/l, 25-60, 15-30 measurements/h, 1.0-3.1% and 1-65 μg/ml for pre-concentration times of 1 min. The procedure was successfully applied to a range of water samples and the accuracy was assessed through recovery experiments, the analysis of certified reference water samples and by independent analysis by atomic absorption spectrometry with electrothermal atomization.

Optimization of stir bar sorptive extraction applied to the determination of odorous compounds in drinking water

2004 ◽  
Vol 49 (9) ◽  
pp. 161-170 ◽  
Author(s):  
D. Benanou ◽  
F. Acobas ◽  
M.R. de Roubin
Keyword(s):  
Water Samples ◽  
Internal Standard ◽  
Stir Bar Sorptive Extraction ◽  
Capillary Gc ◽  
Real Water Samples ◽  
Sorptive Extraction ◽  
Relative Standard ◽  
On Line ◽  
Odorous Compounds

The off-flavour compounds 2-methylisoborneol (MIB), geosmin, 2,4,6-trichloroanisole, 2,3,6-trichloroanisole, 2,3,4-trichloroanisole and 2,4,6-tribromoanisole were analyzed in water samples by Stir Bar Sorptive Extraction (SBSE) followed by on-line thermal desorption (TD)-capillary GC/MS. Quantification was performed using MS in the single ion monitoring mode (SIM) with 2,4,6-trichloroanisol-D5 as internal standard. Quantification limits are 0.1 ng/l to 0.2 ng/l for the haloanisoles, 0.5 ng/l for geosmin and 1 ng/l for MIB. The relative standard deviations at the quantification limit are ranging from 7 to 14.6%. SBSE-recovery was evaluated by spiking real water samples and varied from 87 to 117%. More than twenty samples per day can be analyzed by SBSE-TD-capillary GC-MS. The same technique in combination with olfactometry was used to elucidate unknown odorous compounds in water samples.

scholarly journals Spectrophotometric flow injection system for determination of Zn2+ in ophthalmic formulations using Alizarin red S

2009 ◽  
Vol 34 (2) ◽  
pp. 67-72 ◽  
Author(s):  
Orlando Fatibello-Filho ◽  
Heberth Juliano Vieira
Keyword(s):  
Flow Injection ◽  
Sampling Rate ◽  
Alizarin Red S ◽  
Injection System ◽  
Borate Buffer Solution ◽  
Buffer Solution ◽  
Solution Ph ◽  
Alizarin Red ◽  
Relative Standard

A spectrophotometric flow injection method for the determination of Zn(II) in ophthalmic formulations was developed. In this work, Zn(II) ion was complexed with Alizarin red S in borate buffer solution (pH 9.0) and the chromophore produced was monitored at 520 nm. The analytical curve was linear in the Zn(II) concentration range from 6.05 x 10-6 to 1.50 x 10-4 mol L-1 with a detection limit of 3.60 x 10-6 mol L-1. Recoveries ranged from 96.3 to 105 % and a relative standard deviation of 1.2 % (n = 10) for 5.5x10-5 mol L-1 Zn(II) reference solution were obtained. The sampling rate was 60 h-1 and the results obtained of Zn(II) in ophthalmic products using this procedure are in close agreement with those obtained using a comparative spectrophotometric procedure at 95 % confidence level.

scholarly journals Automatic Flow Procedure for the Determination of Ethanol in Wine Exploiting Multicommutation and Enzymatic Reaction with Detection by Chemiluminescence

2004 ◽  
Vol 87 (4) ◽  
pp. 920-926 ◽  
Author(s):  
Elizabeth N Fernandes ◽  
Boaventura F Reis
Keyword(s):  
Sampling Rate ◽  
Enzymatic Reaction ◽  
Alcohol Oxidase ◽  
Parameters Optimization ◽  
Official Method ◽  
Relative Standard ◽  
Significant Difference ◽  
On Line ◽  
Reagent Consumption

Abstract An automatic procedure for the determination of ethanol in wines using a flow system based on multicommutation and enzymatic reaction is described. Alcohol oxidase was immobilized on aminopropyl glass beads and packed in an acrylic column. The peroxide due to enzymatic reaction with ethanol reacted with luminol and generated the chemiluminescence radiation that was monitored by using a laboratory-made detector based on photodiodes. The system manifold comprised a set of 3-way solenoid valves controlled by a microcomputer furnished with electronic interfaces, which ran on software written in Quick BASIC 4.5 to provide facilities to perform on-line sample dilution, reagent addition, and data acquisition. After system parameters optimization, ethanol samples were processed without prior pretreatment. The following suitable features were achieved: linear response ranging from 2.5 to 25% (v/v) ethanol, relative standard deviation of 1.8% (n = 10), detection limit of 0.3% (v/v) ethanol, sampling rate of 23 determinations per hour, and low reagent consumption of 0.23 mg luminol and 7 mg hexacyanoferrate (III) per determination. When the results were compared with those obtained using the AOAC Official Method, no significant difference at the 90% confidence level was observed.

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