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%.

scholarly journals DETERMINATION OF HEAVY METALS ARSENIC AND CADMIUM IN THE REFILL DRINKING WATER IN PURWOKERTO

2020 ◽  
Vol 5 (1) ◽  
pp. 88
Author(s):  
Sri Royani ◽  
Adita Silvia Fitriana
Keyword(s):  
Drinking Water ◽  
Water Samples ◽  
Absorption Spectrometry ◽  
Health Minister ◽  
Adverse Impacts ◽  
Drinking Water Production ◽  
Aas Method ◽  
The Republic ◽  
Drinking Water Samples

<p><em>Refill drinking water production is now rapidly increasing in several regions in Indonesia, including Purwokerto. According to the Regulation of Health Minister of the Republic of Indonesia (Permenkes) Number 492/Menkes/Per/IV/2010, heavy metal is one of the parameters of drinking water quality which has adverse impacts on human health. In this study, Arsenic (As) and Cadmium (Cd) would be studied. Atomic Absorption Spectrometry (AAS) Method was used to find As and Cd concentration in refill drinking water samples. The results showed that only one sample containing As from five samples was collected, but there is being safe for drinking according to Regulation of Health Minister of the Republic of Indonesia (Permenkes) Number 492/Menkes/Per/IV/2010. Meanwhile, Cd was not detected in samples. It can be concluded that refill drinking water samples that were taken from several depots in Purwokerto City are being safe for drinking.</em></p>

Crosslinked Carboxymethyl Starch Based Solid Phase Extraction Combined with Direct Slurry Sampling Graphite Furnace Atomic Absorption Spectrometry for the Determination of Trace Lead in Water Samples

2011 ◽  
Vol 233-235 ◽  
pp. 452-456
Author(s):  
Meng Wei Gao ◽  
Min Shen ◽  
Hua Kun Lou ◽  
Hao Chen ◽  
Sheng Qing Li ◽  
...  
Keyword(s):  
Water Samples ◽  
Solid Phase ◽  
Graphite Furnace ◽  
Absorption Spectrometry ◽  
Sample Volume ◽  
Phase Extraction ◽  
Slurry Sampling ◽  
Carboxymethyl Starch ◽  
Graphite Furnace Atomic Absorption

A new method of solid phase extraction (SPE), using crosslinked carboxymethyl starch as adsorbent, combined with direct slurry sampling graphite furnace atomic absorption spectrometry (ss-GFAAS) has been developed for the high sensitive determination of lead in water samples. The SPE adsorbent loaded with the analyte was made in to slurry with the assistance of Triton X-100. The slurry was directly injected into the graphite furnace for the determination of lead. Variables such as the pH, sample volume, and amount of Crosslinked Carboxymethyl Starch (CCMS) were investigated. The detection limit (3σ) was 0.082 μg L-1 and the RSD was 4.9% (n = 11, c = 1.0 mg L-1) for Pb(II). The enrichment factor was 100 at a sample volume of 100 mL. The proposed method has been applied to the determination of lead in environmental water reference materials and two water samples with satisfied results.

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%.

Development of a Multiresidue Method for Endocrine-Disrupting Pesticides by Solid Phase Extraction and Determination by UHPLC-MS/MS from Drinking Water Samples

2019 ◽  
Vol 58 (3) ◽  
pp. 195-202 ◽  
Author(s):  
Shaoying Liu ◽  
Xihui Huang ◽  
Kejun Hu ◽  
Quan Jin ◽  
Guonian Zhu
Keyword(s):  
Drinking Water ◽  
Solid Phase Extraction ◽  
Water Samples ◽  
Solid Phase ◽  
Phase Extraction ◽  
Endocrine Disrupting ◽  
Liquid Chromatography Tandem Mass ◽  
The City ◽  
Drinking Water Samples

Abstract A rapid and efficient method based on solid phase extraction and liquid chromatography–tandem mass spectrometry was validated, allowing the determination of the endocrine-disrupting herbicides (acetochlor, alachlor, amitrole and atrazine), fungicides (carbendazim, triadimefon, penconazole and propiconazole), and insecticides (carbaryl and carbofuran) in drinking water. Low method detection limits (0.01–0.64 ng/L) and method quantification limits (0.03–2.13 ng/L) were obtained with satisfactory recoveries and precision for the endocrine-disrupting pesticides. The method was applied for real drinking water samples collected in the area of the city of Hangzhou (Zhejiang, China); the results showed that carbendazim, atrazine and acetochlor were detected in the drinking water samples and acetochlor was the most detected analyte.

scholarly journals Determination of cobalt in water samples by atomic absorption spectrometry after pre-concentration with a simple ionic liquid-based dispersive liquid-liquid micro-extraction methodology

2010 ◽  
Vol 8 (3) ◽  
pp. 617-625 ◽  
Author(s):  
Hossein Abdolmohammad-Zadeh ◽  
Elnaz Ebrahimzadeh
Keyword(s):  
Ionic Liquid ◽  
Atomic Absorption Spectrometry ◽  
Atomic Absorption ◽  
Water Samples ◽  
Limit Of Detection ◽  
Absorption Spectrometry ◽  
Experimental Conditions ◽  
Flame Atomic Absorption ◽  
Relative Standard

AbstractA rapid dispersive liquid-liquid micro-extraction (DLLME) methodology based on the application of 1-hexylpyridinium hexafluorophosphate [C6py][PF6] ionic liquid (IL) as an extractant solvent was applied for the pre-concentration of trace levels of cobalt prior to determination by flame atomic absorption spectrometry (FAAS). 1-Phenyl-3-methyl-4-benzoyl-5-pyrazolone (PMBP) was employed as a chelator forming a Co-PMBP complex to extract cobalt ions from aqueous solution into the fine droplets of [C6py][PF6]. Some effective factors that influence the micro-extraction efficiency include the pH, the PMBP concentration, the amount of ionic liquid, the ionic strength, the temperature and the centrifugation time which were investigated and optimized. In the optimum experimental conditions, the limit of detection (3s) and the enrichment factor were 0.70 µg L−1 and 60, respectively. The relative standard deviation (RSD) for six replicate determinations of 50 µg L−1 Co was 2.36%. The calibration graph using the pre-concentration system was linear at levels 2–166 µg L−1 with a correlation coefficient of 0.9982. The applicability of the proposed method was evaluated by the determination of trace amounts of cobalt in several water samples.

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