A.C. Oscillopolarographic Determination of Aluminum in Natural and Drinking Waters Using the Adsorption of the Al(III)-1,2-Dihydroxyanthraquinone-3-sulfonic Acid Complex

1996 ◽  
Vol 61 (12) ◽  
pp. 1745-1753 ◽  
Author(s):  
Shuping Bi ◽  
Zhengjiang Zhang
Keyword(s):  
Drinking Water ◽  
Sulfonic Acid ◽  
Aluminum Concentration ◽  
Buffer Solution ◽  
Acid Complex ◽  
Fast Determination ◽  
Drinking Waters ◽  
Relative Standard ◽  
Drinking Water Samples

This paper presents a very simple and rapid method for determination of aluminum in natural and drinking waters by using a.c. oscillopolarographic adsorptive wave of the Al(III)-1,2-dihydroxyanthraquinone-3-sulfonic acid complex in a triethanolamine buffer solution of pH 7.6 at HMDE. A linear dependence between the incision height on dE/dt-E oscillogram and the aluminum concentration was obtained in the range from 5 . 10-6 to 5 . 10-5 mol l-1. The detection limit is 1 . 10-6 mol l-1 and the relative standard deviation is 6.0% for 4 . 10-5 mol l-1 aluminum. This method has the distinct advantages of cheap instrumentation, simple and rapid manipulation and deaeration is unnecessary. It is especially suitable for the fast determination of aluminum in natural and drinking water samples.

Gas Chromatographic/Nitrogen-Phosphorus Detection Method for Determination of Ethylene Thiourea in Finished Drinking Waters: Collaborative Study

1993 ◽  
Vol 76 (5) ◽  
pp. 1113-1120 ◽  
Author(s):  
James E Longbottom ◽  
Kenneth W Edgell ◽  
Elizabeth J Erb ◽  
Viorica Lopez-Avila ◽  
◽  
...  
Keyword(s):  
Gas Chromatography ◽  
Drinking Water ◽  
Drinking Waters ◽  
Relative Standard ◽  
The Mean ◽  
Ethylene Thiourea ◽  
Standard Deviations ◽  
Nitrogen Phosphorus Detector ◽  
Nitrogen Phosphorus

Abstract A joint U.S. Environmental Protection Agency (USEPA)-AOAC interlaboratory method validation study was conducted on USEPA National Pesticide Survey (NPS) Method 6, "Determination of Ethylene Thiourea (ETU) in Finished Drinking Water by Gas Chromatography with a Nitrogen-Phosphorus Detector." The purpose of the study was to determine and compare the mean recoveries and precision for determination of ETU in reagent water and finished drinking waters. The study design was based on Youden's nonreplicate plan for collaborative tests of analytical methods. The waters were spiked with ETU at 6 concentrations levels, prepared as 3 Youden pairs. In the method, the test water is extracted by passing the sample through an absorbent matrix type tube. ETU is recovered from the tube with methylene chloride, the extract is solvent-exchanged to ethyl acetate, and an aliquot of each extract is analyzed by gas chromatography using a nitrogen-phosphorus detector. Twelve laboratories participated in the study. Data were analyzed using a USEPA computer program, which measured recovery and precision for ETU and compared the performance of the method between the 2 water types. Over the concentration range tested, the mean percent recoveries of ETU were 82-92% in reagent water and 85-98% in finished drinking water. The range of the betweenlaboratory relative standard deviations (RSDR) for the 6 concentrations was 5-24% in reagent water, but was only 4-9% in finished drinking water. The range of the within-laboratory relative standard deviations (RSDr) was 6-14% for reagent water and 6- 10% for finished drinking water. Results for the 2 water matrixes showed no statistically significant differences. The method has been adopted first action by AOAC International for determination of ETU in finished drinking waters.

Liquid Chromatographic Determination of Pesticides in Finished Drinking Waters: Collaborative Study

1992 ◽  
Vol 75 (5) ◽  
pp. 858-871 ◽  
Author(s):  
Kenneth W Edgell ◽  
Elizabeth J Erb ◽  
James E Longbottom ◽  
Vlorica Lopez-Avila
Keyword(s):  
Drinking Water ◽  
Liquid Chromatography ◽  
Collaborative Study ◽  
Survey Method ◽  
Method Performance ◽  
Ultraviolet Detector ◽  
Poor Recovery ◽  
Drinking Waters ◽  
Relative Standard

Abstract A joint U.S. Environmental Protection Agency (EPA)/AOAC International collaborative study was conducted on EPA National Pesticide Survey Method 4, Determination of Pesticides in Finished Drinking Water by High Performance Liquid Chromatography with an Ultraviolet Detector, to determine mean recovery and precision for analyses of 18 pesticides and metabolites in reagent water and finished drinking waters. The study design was based on Youden's nonreplicate plan for collaborative studies of analytical methods. The waters were spiked with 18 pesticides and metabolites at 6 concentration levels, prepared as 3 Youden pairs. Ten volunteer laboratories extracted the spiked test waters with methylene chloride, performed a solvent exchange with methanol, and analyzed an aliquot of each extract by liquid chromatography using an ultraviolet detector at 254 nm. Results were analyzed using an EPA computer program that calculated recovery and precision for each of the 18 compounds and compared method performance between water types. The method was judged useable for all analytes tested. Recoveries were good for 16 of the analytes. The method exhibited poor recovery but acceptable between-laboratory precision for metribuzin DADK and metribuzin DK. The method performance statistics for carbofuran phenol and linuron were calculated to be significantly different for reagent water and finished drinking water. Similar statistical differences were observedfor metribuzin DADK, but these effects were not considered of practical significance due to the poor recovery (<25%) in both waters. In reagent water, the overall relative standard deviation (RSDR) range was 7.8-24.1% for all 18 compounds and 5.5-38.6% in finished drinking water. The single- analyst relative standard deviations (RSDr) range was 5.7-17.6% in reagent water and 4.0- 18.7% in finished drinking water. The method has been adopted first action by AOAC International.

scholarly journals Preconcentration with 1-Nitroso-2-naphthol Complexes on Dowex MWC-1 Resin: Determination of Cu and Zn at Trace Level in Drinking Water Samples by ICP-AES

2009 ◽  
Vol 6 (4) ◽  
pp. 1176-1180 ◽  
Author(s):  
A. Demir Mulazimoglu ◽  
I. E. Mulazimoglu ◽  
E. Ozkan
Keyword(s):  
Drinking Water ◽  
Water Samples ◽  
Standard Addition ◽  
Sorption Process ◽  
Chelating Resin ◽  
Buffer Solution ◽  
Ph Values ◽  
Drinking Water Samples ◽  
Determination Of Copper

In this study, copper(II) and zinc(II) were quantitatively determined in drinking water using ICP-AES after preconcentration. For this purpose, the water samples were treated with 1-nitroso-2-naphthol to form metal complexes on Dowex MWC-1 resin. Prior to the sorption process, the column was treated with a chelating resin Dowex MWC-1 and the column was prepared by passing buffer solution at different pH values. These columns were used for the transportation of water samples through the resin at the flow rate of 2.00 mL min-1. The effluents were then analyzed by ICP-AES using standard addition method. The effect of pH, amount of resin, ligand concentration and eluent type were investigated. The detection limit for Cu(II) and Zn(II) were found to be 2.78 μg L-1and 6.34 μg L-1respectively (RSD.’s <%5).it would be concluded that the determination of copper(II) and zinc(II) in drinking water was simple, fast and repliable using this technique.

Carbon dot doped silica nanoparticles as fluorescent probe for determination of bromate in drinking water samples

2018 ◽  
Vol 96 (1) ◽  
pp. 24-29 ◽  
Author(s):  
Guoqiang Xiang ◽  
Huanhuan Fan ◽  
Heng Zhang ◽  
Lijun He ◽  
Xiuming Jiang ◽  
...  
Keyword(s):  
Drinking Water ◽  
Silica Nanoparticles ◽  
Fluorescent Probe ◽  
Water Samples ◽  
Carbon Dot ◽  
Relative Standard ◽  
Silylation Reaction ◽  
Drinking Water Samples ◽  
Sensor Probe

A simple and effective strategy for designing a fluorescent probe for bromate was described in this work. Organosilane modified carbon dots were prepared by pyrolysis of citric acid in N-(β-aminoethyl)-γ-aminopropyl methyldimethoxysilane solvent at 230 °C and further doped onto silica nanoparticles by a silylation reaction. The fluorescence of carbon dot doped silica nanoparticles was quenched by bromate in acidic medium. By utilizing this property, the nanoparticle could be used as a sensor to detect bromate. The parameters affecting the performance of the sensor probe such as types of acid medium, acid concentration, reaction temperature, and time were investigated and optimized. The detection limit of the sensor was found to be 1.1 ng mL−1, with a linear range from 8 to 400 ng mL−1 and relative standard deviation of 2.0% (150 ng mL−1, n = 9). The method was successfully applied to the determination of bromate in drinking water samples, and the recoveries were in the range of 96.3%–103.7%.

scholarly journals Determination of Arsenic in Drinking Water Samples by Electrothermal Atomic Absorption Spectrometry after Preconcentration Using the Biomass ofAspergillus nigerLoaded on Activated Charcoal

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Mohsen Shahlaei ◽  
Alireza Pourhossein
Keyword(s):  
Drinking Water ◽  
Water Samples ◽  
Activated Charcoal ◽  
Solid Phase ◽  
Electrothermal Atomic Absorption Spectrometry ◽  
Absorption Spectrometry ◽  
Sample Volume ◽  
Relative Standard ◽  
Drinking Water Samples

A simple, fast, and sensitive method for determination of total arsenic in drinking water sample by ETAAS after solid phase preconcentration has been developed. The dead biomass ofA. nigerloaded on activated charcoal has been applied as bioadsorbent for preconcentration step. The effects of parameters such as pH, type and concentration of eluent, biosorption time, sample volume, and effect of interfering ions have also been studied. Under the optimum condition, the enrichment factor of 10 for the analyte has been obtained. The accuracy of the method has been investigated by the recovery of spiked standards and the recovery percents between 99 and 102% have been achieved. Total amount of arsenic was determined by reducing As (V) to As (III) with potassium iodide (KI) and ascorbic acid in HCl solution. Under the optimum conditions, for 400 mL of drinking water samples, the detection limit (3σ) and linear range were achieved 1 ng/mL and 5–100 ng/mL, respectively. The relative standard deviation for ten determinations of a spiked sample with concentration of 10 ng/mL As was 3.2%.

Determination of Tin in Canned Fruits and Vegetables by Atomic Absorption Spectrometry and Liquid–Liquid Extraction

1994 ◽  
Vol 77 (6) ◽  
pp. 1627-1630 ◽  
Author(s):  
Ana M Martín ◽  
Mercedes Sánchez ◽  
Pedro Espinosa ◽  
Gracia Bagur
Keyword(s):  
Aqueous Phase ◽  
Fruits And Vegetables ◽  
Methyl Ketone ◽  
Absorption Spectrometry ◽  
Liquid Extraction ◽  
Acid Complex ◽  
Liquid Liquid Extraction ◽  
Relative Standard ◽  
Good Agreement

Abstract A method was developed for the determination of tin based on the extraction of its 5,5-methylenedisalicylohydroxamic acid complex with 1.09M isobutyl methyl ketone in tributyl phosphate. After the samples were treated with nitric and hydrochloric acid, the aqueous phase was made to 0.05M in perchloric acid. When the ratio of aqueous phase to organic phase was 4:1 (v/v), the detection limit and the relative standard deviation (n = 7,50 μg tin) were 0.20 μg/mL and 0.9%, respectively. The proposed method was applied to the analysis of tin in canned fruits and vegetables. The results were in good agreement with those obtained by the phenylfluorone method.

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