Direct determination of δ(D) and δ(18O) in water samples using cavity ring down spectrometry: Application to bottled mineral water

2012 ◽  
Vol 119-120 ◽  
pp. 1-5 ◽  
Author(s):  
Jose Marcus Godoy ◽  
Maria Luiz D.P. Godoy ◽  
Alcindo Neto
Keyword(s):  
Water Samples ◽  
Mineral Water ◽  
Direct Determination ◽  
Bottled Mineral Water ◽  
Cavity Ring Down

scholarly journals HPLC-DAD Determination of Iodide in Mineral Waters on Phosphatidylcholine Column

Molecules ◽  
2019 ◽  
Vol 24 (7) ◽  
pp. 1243 ◽  
Author(s):  
Małgorzata Tatarczak-Michalewska ◽  
Jolanta Flieger ◽  
Justyna Kawka ◽  
Wojciech Flieger ◽  
Eliza Blicharska
Keyword(s):  
Water Samples ◽  
Mineral Water ◽  
Limit Of Detection ◽  
Direct Determination ◽  
Sample Pretreatment ◽  
Calibration Graph ◽  
Mineral Waters ◽  
Independent Analysis ◽  
Relative Standard

Iodine is an essential nutrient necessary for the production of thyroid hormones. A valuable source of iodide, which is the bio-available iodine form could be mineral waters offered by different spas. In this work, the method capable of direct determination of iodide in mineral water samples based on IAM liquid chromatography on the phosphatidylcholine column (IAM.PC.DD2 Regis HPLC) with DAD detection without sample pretreatment or any pre-concentration steps is presented. The calibration graph for iodide was linear in the range of 0.5–10.0 mg L−1 with a correlation coefficient of 0.9996. The limit of detection was 22.84 ng mL−1. The relative recoveries were in the interval of 98.5–100.2% and the repeatability, expressed as a relative standard deviation (RSD) was less than 5%. The RSA (Response Surface Analysis) investigated the effect of the sample concentration and the injection volume. The iodide concentrations in the mineral water samples ranged from 0.58 to 2.88 mg L−1. The accuracy of the method was assessed through independent analysis by ICP-MS. Iodide levels measured by these two procedures did not significantly differ. The effects of interfering ions like HCO3−, Cl−, SO42−, F−, and Br− were also tested. The analysis has shown insignificant differences in the values of the iodide peak area and its height measured in multicomponent mixtures with an error smaller than 5%.

scholarly journals Yeasts and filamentous fungi in bottled mineral water and tap water from municipal supplies

2007 ◽  
Vol 50 (1) ◽  
pp. 1-9 ◽  
Author(s):  
Mirian Ueda Yamaguchi ◽  
Rita de Cássia Pontello Rampazzo ◽  
Sueli Fumie Yamada-Ogatta ◽  
Celso Vataru Nakamura ◽  
Tânia Ueda-Nakamura ◽  
...  
Keyword(s):  
Filamentous Fungi ◽  
Water Samples ◽  
Mineral Water ◽  
Tap Water ◽  
Health Hazard ◽  
Total Coliform ◽  
Species Level ◽  
Potential Health ◽  
Potential Health Hazard ◽  
Bottled Mineral Water

The main objective of this study was to analyse the occurrence of yeasts and filamentous fungi in drinking water as well as to investigate their correlation with the indicator bacteria of faecal pollution. Yeasts were detected in 36.6% and 11.6% of the bottled mineral on water dispensers and tap water samples from municipal system, respectively. Twenty-one (35.0%) of bottled mineral water and two (3.3%) of tap water samples were positive for filamentous fungi. For bottled mineral water 12 (20.0%) of 60 samples were positive for total coliform, compared with 3(5.0%)out of 60 samples from tap water. The mineral water from dispensers was more contaminated than tap water. Strains belonging to the genera Candida identified to the species level were C. parapsilosis, C. glabrata and C. albicans. Thus, bottled mineral water from water dispensers and tap water could be considered a possible transmission route for filamentous fungi and yeasts, and could constitute a potential health hazard, mainly to immunocompromised indivuals.

scholarly journals APPLICATION OF A SCINTILLATION GAMMA-SPECTROMETER FOR DETERMINATION OF RADON CONTENT IN WATER

2021 ◽  
pp. 187-190
Author(s):  
D.А. Hakimov ◽  
I.V. Zhuk ◽  
M.K. Kievets
Keyword(s):  
Water Samples ◽  
Mineral Water ◽  
Experimental Studies ◽  
Gamma Spectrometer ◽  
Scintillation Gamma ◽  
Measurement Results ◽  
Measurable Activity ◽  
Measurement Geometry ◽  
Radon Content

Experimental studies have been carried out to determine the sensitivity of a mobile scintillation gamma-spectrometer to radon-222 in mineral water samples for the selected measurement geometry and the minimum measurable activity of radon-222 in such samples. The measurement results of radon content in mineral water samples obtained using such gamma-spectrometer are presented too.

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.

Commercialization Conditions and Practices Influence the Microbiological Quality of Mineral Waters

2008 ◽  
Vol 71 (6) ◽  
pp. 1253-1257 ◽  
Author(s):  
SÉRGIO A. P. NUNES FILHO ◽  
ANDERSON S. SANT'ANA ◽  
ADRIANO G. CRUZ
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Water Samples ◽  
Mineral Water ◽  
Microbiological Quality ◽  
Mineral Waters ◽  
Fecal Coliforms ◽  
Street Vendors ◽  
Total Coliforms ◽  
Bottled Mineral Water

The objective of the present study was to determine the microbiological quality of bottled mineral water marketed in commercial establishments and by street vendors and to evaluate the influence of the storage and maintenance conditions on the microbiological quality of the product. Ten samples from the same batches of five different brands of water were analyzed, for a total of 50 samples. Of the five brands analyzed, only one (brand A), when collected in a commercial establishment, complied with the legal Brazilian standards for mineral water with respect to the presence of total coliforms, fecal coliforms, and Pseudomonas aeruginosa. The remaining samples failed to comply with these microbiological standards for at least one of the parameters evaluated. The water samples obtained from street vendors were inferior in microbiological quality to samples from the same batch that were obtained from commercial establishments.

scholarly journals Detection ofHelicobacter pyloriin City Water, Dental Units' Water, and Bottled Mineral Water in Isfahan, Iran

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Ahmad Reza Bahrami ◽  
Ebrahim Rahimi ◽  
Hajieh Ghasemian Safaei
Keyword(s):  
Water Samples ◽  
Mineral Water ◽  
Tap Water ◽  
Public Places ◽  
Isfahan Province ◽  
Coccoid Form ◽  
Cultural Method ◽  
Water Cooler ◽  
H Pylori ◽  
Bottled Mineral Water

Helicobacter pyloriinfection in human is one of the most common infections worldwide. However, the origin and transmission of this bacterium has not been clearly explained. One of the suggested theories is transmission via water. This study was conducted to determine the prevalence rate ofH. pyloriin tap water, dental units' water, and bottled mineral water in Iran. In the present study, totally 200 water samples were collected in Isfahan province and tested forH. pyloriby cultural method and polymerase chain reaction (PCR) by the detection of theureC (glmM)gene. Using cultural method totally 5 cultures were positive. Two out of 50 tap water samples (4%), 2 out of 35 dental units' water (5.8%) samples, and 1 out of 40 (2.5% ) from water cooler in public places were found to be contaminated withH. pylori.H. pylori ureCgene was detected in 14 (7%) of water samples including 5 tap water (10%), 4 dental units' water (11.4%), 1 refrigerated water with filtration, and 4 (10%) water cooler in public places samples. This may be due to the coccoid form of bacteria which is detected by PCR method.

Miniaturised enzymatic conductometric biosensor with Nafion membrane for the direct determination of formaldehyde in water samples

2013 ◽  
Vol 406 (4) ◽  
pp. 1039-1048 ◽  
Author(s):  
Thanh-Thuy Nguyen-Boisse ◽  
Joëlle Saulnier ◽  
Nicole Jaffrezic-Renault ◽  
Florence Lagarde
Keyword(s):  
Water Samples ◽  
Direct Determination ◽  
Nafion Membrane ◽  
Conductometric Biosensor

scholarly journals The occurrence of Aeromonas spp. in the bottled mineral water, well water and tap water from the municipal supplies

2008 ◽  
Vol 51 (5) ◽  
pp. 1049-1055 ◽  
Author(s):  
Denise de Oliveira Scoaris ◽  
Fernando Cezar Bizerra ◽  
Sueli Fumie Yamada-Ogatta ◽  
Benício Alves de Abreu Filho ◽  
Tânia Ueda-Nakamura ◽  
...  
Keyword(s):  
Drinking Water ◽  
Water Samples ◽  
Mineral Water ◽  
Tap Water ◽  
Indicator Bacteria ◽  
Well Water ◽  
Total Coliforms ◽  
Water Well ◽  
Artesian Water ◽  
Bottled Mineral Water

The aim of this work was to study the occurrence of Aeromonas sp in the bottled mineral water, well water and tap water from the municipal supplies. Positive samples were found for Aeromonas spp. 12.7% from the mineral water, 8.3% from the artesian water and 6.5% from the tap water. The recovery of Aeromonas spp. was significantly higher in the bottled mineral and artesian water than in the tap water from municipal supplies. The occurrence of the Aeromonas spp. did not correlate significantly with the contamination indicator bacteria (i.e. total coliforms) in the artesian water samples. However, a significant correlation was found between Aeromonas spp. and total coliforms in the both mineral water and tap water samples. The presence or absence of a correlation between the indicator bacteria and Aeromonas could reflect the occasional appearance of the pathogen in the drinking water and the different rates of survival and recovery of these agents compared with those fecal indicators. The finding that 41.6, 14.8 and 9.0 % of the artesian water, bottled mineral water and tap water, respectively, sampled in the current study failed to meet the Brazilian standard for total coliforms in the drinking water should therefore be of concern.

Simultaneous and direct determination of glyphosate and AMPA in water samples from the hydroponic cultivation of eucalyptus seedlings using HPLC-ICP-MS/MS

2020 ◽  
Vol 55 (6) ◽  
pp. 558-565
Author(s):  
João P. F. Tiago ◽  
Lázaro C. Sicupira ◽  
Rodrigo E. Barros ◽  
Gevany P. de Pinho ◽  
Flaviano O. Silvério
Keyword(s):  
Water Samples ◽  
Direct Determination ◽  
Icp Ms ◽  
Hydroponic Cultivation
Sign in / Sign up

Export Citation Format

Share Document