scholarly journals Activated Carbon as an Adsorbent for the Separation of Low-Molecular Alkyl Halides from Ground Water in the Production of Drinking-Water

1988 ◽  
Vol 5 (1) ◽  
pp. 13-28 ◽  
Author(s):  
A. Roebers ◽  
Th. Roncken ◽  
R. Hopman ◽  
CL de Ligny ◽  
B.G. Dekker ◽  
...  
Keyword(s):  
Drinking Water ◽  
Activated Carbon ◽  
Adsorption Isotherm ◽  
Ground Water ◽  
Accurate Method ◽  
Alkyl Halides ◽  
Freundlich Equation ◽  
Powdered Carbon ◽  
Different Types

An accurate method has been developed for the determination of the adsorption isotherm of trichloroethene on activated carbon over the concentration range 1 – 100 μg/1. This method has been applied to 18 samples of activated carbon of different types, both virgin and regenerated. All samples of activated carbon were characterized by determining the apparent density of the granular and the powdered carbon, and the Fe, Mn, Ca and Mg contents were determined for eight samples. The best way to describe the results mathematically has been investigated, and an improvement to the well-known Freundlich equation established.

scholarly journals Separation Cum Pre-Concentration Technique for Determination of Uranium in Sea, Brine and Ground Water at Nano to Sub nanogram Levels

2020 ◽  
pp. 302-312
Author(s):  
Leela Gopal ◽  
V. V. Hanuman ◽  
G. Chakrapani
Keyword(s):  
Activated Carbon ◽  
Aqueous Solutions ◽  
Ground Water ◽  
Contact Time ◽  
Sea Water ◽  
Cost Effective ◽  
Powdered Activated Carbon ◽  
Concentration Technique ◽  
Led Fluorimetry

Investigations were carried out for separation/pre concentration of uranium from aqueous solutions of different TDS using Powdered Activated Carbon (PAC). Parameters like amount of PAC, contact time, pH, volume of solutions and reagents for desorption were optimized. The sorption of uranium is more than 95% at pH 4-5 using 0.5 gram PAC with a contact time of 10 minutes.  The sorbed uranium on PAC is recovered using 0.8N HNO<sub>3</sub> and determined by LED Fluorimetry.  Method was successfully applied to ground water, sea water and brine water.  Methodology is simple, selective, cost effective with minimal skills. RSD of the method varies ± 6-14 %.

scholarly journals Determination of Arsenic (As) and Iron (Fe) Concentration in Ground Water and Associated Health Risk by Arsenic Contamination in Singair Upazila, Manikganj District, Bangladesh

2020 ◽  
pp. 32-41
Author(s):  
Atkeeya Tasneem ◽  
Tanvir Ahmed ◽  
Md. Khabir Uddin
Keyword(s):  
Public Health ◽  
Drinking Water ◽  
Health Risk ◽  
Ground Water ◽  
Inorganic Arsenic ◽  
Standard Level ◽  
The Mean ◽  
Tube Well ◽  
Mean Concentration

Contamination of drinking water by Arsenic (As) & Iron (Fe) is nowadays appeared as a big concern for public health and environment as well. Immoderate and continued revelation of inorganic arsenic along with drinking water is triggering arsenicosis. High Fe and As concentration found in the study area is also appeared as very challenging to those people who are consuming the water on regular basis and they may confront to a high health risk. This study is conducted to determine the concentration of Fe and As in ground tube-well containing possible health risk in Bangladesh which examines the ground water As and Fe scenario of Singair Upazila, Manikganj district. Total 40 samples were collected from the study area. As and Fe were analyzed using Atomic Absorption Spectrophotometer (AAS). The study found As concentration ranged from 0.0011 to 0.0858 mg/L with the mean concentration as 0.04186 mg/L. Concentration of Fe was found 0.175 to 13.865 mg/L with the mean concentration as 3.600 mg/L whereas WHO standard level is 0.01 mg/L for As and 0.3 mg/l for Fe. It was also noticed that As and Fe concentration in shallow tube-well was relatively high than that in deep tube-well and a strong correlation between As and Fe was marked in the ground water. Therefore, to cope with this challenge, people should look for other sources or relocate the tube-well or treat the water for drinking and other everyday purposes.

Pesticide removal and efficiency of different types of granular activated carbon

2021 ◽  
Author(s):  
Michal Marton ◽  
Ján Ilavský ◽  
Danka Barloková
Keyword(s):  
Drinking Water ◽  
Activated Carbons ◽  
Complex Structure ◽  
Agricultural Fields ◽  
Great Problem ◽  
Pesticide Removal ◽  
Different Types ◽  
Micro Pollutants ◽  
Better Than

AbstractPesticides as one of the micro-pollutants present a great problem and threat to the environment and human health. They can infiltrate the sources of drinking water by application on the agricultural fields. This article is focused on Atrazine, Terbuthylazine and their metabolites. It is their complex structure that makes them hard to degrade naturally and, thus, water needs to be treated before safe using. Therefore, this article studies adsorption on the two granular activated carbons Filtrasorb 400 and Norit 1240 W. For the determination of the concentration liquid chromatography was used. In this article it is presented that Filtrasorb 400 efficiency (26–40% and 33–45% for atrazine and terbuthylazine respectively) is better than the efficiency of Norit 1240 W (9–27% and 10–24% for atrazine and terbuthylazine respectively).

Solid-phase preconcentration and determination of mercury(II) using activated carbon in drinking water by X-ray fluorescence spectrometry

2013 ◽  
Vol 42 (2) ◽  
pp. 100-104 ◽  
Author(s):  
Pedro R. Aranda ◽  
Leandro Colombo ◽  
Ernesto Perino ◽  
Irma E. De Vito ◽  
Julio Raba
Keyword(s):  
Drinking Water ◽  
Activated Carbon ◽  
Solid Phase ◽  
Fluorescence Spectrometry ◽  
X Ray

scholarly journals Activated Carbon as an Adsorbent for the Separation of Low-Molecular Weight Alkyl Halides from Ground Water in the Production of Drinking Water. II. The Relationship between the Adsorption Capacity for Trichloroethene of Virgin and Regenerated Activated Carbons, and Their Achievement in the Purification of Deep-Well Ground Water

1988 ◽  
Vol 5 (4) ◽  
pp. 289-296 ◽  
Author(s):  
Th. Roncken ◽  
A. Roebers ◽  
R. Hopman ◽  
C.L. de Ligny ◽  
B.G. Dekker ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Ground Water ◽  
Adsorption Capacity ◽  
Activated Carbons ◽  
Alkyl Halides ◽  
Low Molecular Weight ◽  
Time Intervals ◽  
Deep Well ◽  
A Charge ◽  
The Relationship

Activated carbon can be used for the separation of trichloroethene from contaminated deep-well ground water. When the activated carbon has become saturated with trichloroethene, it may be regenerated (i.e., purified from trichloroethene) by the manufacturer. After regeneration, it can be used again. It is shown that the activated carbon deteriorated gradually upon regeneration. Successive regenerations became necessary after ever-decreasing time intervals, and the amount of trichloroethene adsorbed from the ground water decreased gradually. It appears that the efficiency in the separation of trichloroethene from ground water of the regenerated activated carbons is proportional to their adsorption capacity for trichloroethene at equilibrium. This relationship can be used to predict the efficiency of a charge of regenerated activated carbon in the separation of trichloroethene from deep-well ground water.

scholarly journals Evaluation of the Efficiency of 2 Types of Periodontal Probing

2015 ◽  
Vol 19 (3) ◽  
pp. 163-166
Author(s):  
Alexandra Martu ◽  
C. Popa ◽  
I.A. Luchian ◽  
Ioana Martu ◽  
Cornelia Oanta ◽  
...  
Keyword(s):  
Clinical Examination ◽  
Accurate Method ◽  
Treatment Results ◽  
Periodontal Status ◽  
Tolerance Level ◽  
Different Types ◽  
Electronic Probe ◽  
Periodontal Risk ◽  
Periodontal Probing

SummaryBackground: The periodontal probing has an important role in clinical examination of the periodontal status; different types of periodontal probes have been described. The aim of this investigation was to evaluate comparatively the efficiency of periodontal probing with conventional periodontal probe and electronic periodontal probe.Material and Methods: We examined 57 patients, each patient being subjected to conventional and electronic probing. We assessed the tolerance degree for each probing type and also the time consumed by probing and periodontal charting.Results: The periodontal probing with the electronic probe revealed superior results regarding the accuracy of the measurements, the tolerance level and the time consumed.Conclusions: The electronic periodontal probing is an exceptionally accurate method in establishing diagnosis and assessing treatment results. The electronic periodontal probe represents an efficient and useful tool for measurements of the gingival sulcus and periodontal pockets, and also for determination of the periodontal risk.

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