scholarly journals Flow-through electrochemistry in the analysis of wine

2022 ◽  
Vol 7 (1) ◽  
pp. 101-106
Author(s):  
Ernest Beinrohr ◽  
Stanislava Hlubikova ◽  
Jarka Lastincova
Keyword(s):  
Heavy Metals ◽  
Thin Layer ◽  
Coulometric Titration ◽  
Ethanol Content ◽  
Low Concentrations ◽  
Stripping Chronopotentiometry ◽  
Flow Through

Flow through coulometry is used for analysis of wine samples for the determination of some heavy metals, sulphites, acidity and ethanol content. Low concentrations of heavy metals and sulphite contents are determined by making use of stripping chronopotentiometry. For the measurement of acid and ethanol content thin-layer coulometric titration is used.

scholarly journals Experimental and theoretical analysis of (water) permeability variation of nonwoven textiles subjected to compression

2017 ◽  
Vol 18 (3) ◽  
pp. 307 ◽  
Author(s):  
Petrica Turtoi ◽  
Traian Cicone ◽  
Aurelian Fatu
Keyword(s):  
Theoretical Analysis ◽  
Thin Layer ◽  
Water Permeability ◽  
Darcy Law ◽  
Plane Flow ◽  
Flow Through ◽  
Forchheimer Model ◽  
Nonwoven Textiles ◽  
Original Device

This paper presents the experimental determination of permeability for unidirectional in-plane flow through a thin layer of nonwoven porous textile subjected to various rates of compression. The experiments were made on an original device that allows the variation of porous layer compression and pressure differential. The permeability was calculated assuming the validity of Darcy law and, in parallel, Darcy-Forchheimer model. The preliminary results obtained with water show that pressure gradient does not influence sensibly the resistance to flow of the material and Darcy’s law is applicable. For permeability-porosity correlation the experimental results were fitted using the well-known Kozeny-Carman equation. Also good correlation was found with other two models derived from Kozeny-Carman.

scholarly journals Effect of Wastewater Sample Pre-Treatment on Determination of Selected Heavy Metals Using ICP-MS Method

2020 ◽  
Vol 2 (1) ◽  
Author(s):  
Iva KOTALOVÁ ◽  
Katrin CALÁBKOVÁ ◽  
Martina NOVÁČKOVÁ ◽  
Silvie DRABINOVÁ ◽  
Silvie HEVIÁNKOVÁ
Keyword(s):  
Heavy Metals ◽  
Nitric Acid ◽  
Polyaromatic Hydrocarbons ◽  
Treated Wastewater ◽  
Wastewater Sample ◽  
Lead And Cadmium ◽  
Low Concentrations ◽  
Icp Ms ◽  
Pre Treatment

Polychlorinated substances, polyaromatic hydrocarbons, heavy metals and pesticides are among the priority even at low concentrations. The problem, however, is that such low concentrations are impossible to measure using most available methods. This researchfocused on the determination of selected priority substances – heavy metals, namely lead and cadmium, in which the determination ofPb and Cd in wastewater by Inductively Coupled Plasma Mass Spectrometry (ICP-MS) was preceded by water sample pre-treatment.The paper deals with the influence of the pre-treatment on the resulting measured values. Two processes were selected as pre-treatmentprocesses. The first pre-treatment procedure was a simple filtration using a filter paper for moderate filtration. As the second procedure, we applied decomposition of the sample by nitric acid in the open system. The pre-treated wastewater samples were subsequentlyexamined using ICP-MS. Based on the obtained results, we can conclude that decomposition of the sample by nitric acid in the opensystem is a more suitable pre-treatment method for water samples

Heavy metal levels in cassava flour sold in Okura, Ejule and Ojapata of kogi state, Nigeria

2021 ◽  
Vol 19 (3) ◽  
pp. 45-54
Author(s):  
Olubiyo Gloria Taiye ◽  
Yakubu Anita Ohunene ◽  
Olubiyo Comfort Kehinde
Keyword(s):  
Heavy Metals ◽  
Human Exposure ◽  
Cassava Flour ◽  
Low Concentrations ◽  
Zn Concentration ◽  
Guideline Values ◽  
Metal Levels ◽  
Iron And Zinc

Cassava (Manihot esculenta) is a major source of carbohydrate and a staple food cultivated in Nigeria especially in Kogi  State. Determination of heavy metals in cassava flour from major markets:(Okura ,Ejule and Ojapata) in Kogi East was done to ascertain the quality of cassava flour and its human exposure path.Lead, cadmium, iron and zinc contents were determined using Atomic Absorption Spectrophotometer (AAS).The results were analysed using Analysis of Variance (ANOVA), Duncan Multiple Range Test (DMRT) and  Independent Sample t-test. Zn concentration in Ejule (Control) was as low as 0.002±0.000a . Pd,Cd,Fe, and Zn screened were far below the WHO guideline values or permissible limit of metal in food.This implies that the metal toxicants present in the cassava flour is in such low concentrations that render the food non-toxic and edible. Keywords: Heavy metals; pollution; cassava flour; human exposure.

scholarly journals Determination of the zinc and cadmium contents in low-alloyed tin

1999 ◽  
Vol 64 (11) ◽  
pp. 707-720
Author(s):  
N.Z. Blagojevic ◽  
R.M. Zejnilovic ◽  
A.R. Despic ◽  
Z. Blecic
Keyword(s):  
Thin Layer ◽  
Solid Solutions ◽  
Analytical Methods ◽  
Linear Sweep Voltammetry ◽  
Sweep Rate ◽  
Eutectic Type ◽  
Linear Sweep ◽  
Low Concentrations ◽  
Non Destructive

The method of anodic linear sweep voltammetry (ALSV) has been used to determine the content of Zn and Cd (up to 4% w/w) in eutectic type binary alloys with Sn. The alloy samples were prepared by casting. The effect of the type and the pH of the electrolyte, as well as of the sweep-rate on the dissolution of Zn and Cd from the alloy during an anodic potentinal-sweep was investigated. It was shown that ALSV is sensitive to low concentrations of both Zn and Cd in the investigated alloys, as well-defined peaks of the dissolution of the two metals were recorded before the massive dissolution of Sn commenced. Well-defined linear dependencies between the quantities of electricity under the dissolution peaks of Zn (QZn) or Cd (QCd) and the respective contents of the metals in the alloys were found. Intercepts at the abscissa were found in both investigated systems indicating the formation of solid solutions from which neither Zn norCd could be eluted. In both alloys, the smallest amount of the alloying component which could be detected was 0.25% (w/w). The application of the ALSV method has several advantages over other analytical methods: it is non-destructive as the dissolution involves only a very thin layer of the alloy; it requires simple and cheap instrumentation; it is fast and relatively sensitive. These make it suitable for routine analysis.

Determination of manganese in water samples by galvanostatic stripping chronopotentiometry in a flow-through cell

The Analyst ◽  
1994 ◽  
Vol 119 (6) ◽  
pp. 1355-1359 ◽  
Author(s):  
Ernest Beinrohr ◽  
Pavol Csémi ◽  
Francisco J. Rojas ◽  
Helena Hofbauerová
Keyword(s):  
Water Samples ◽  
Stripping Chronopotentiometry ◽  
Flow Through
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