scholarly journals Removal of radioactive Cs from gravel conglomerate using water containing air bubbles

2013 ◽  
Vol 67 (5) ◽  
pp. 996-999 ◽  
Author(s):  
Yoshikatsu Ueda ◽  
Yomei Tokuda ◽  
Fujimura Shigeto ◽  
Naoto Nihei ◽  
Toru Oka
Keyword(s):  
Human Health ◽  
Laboratory Experiments ◽  
Tap Water ◽  
Radioactive Material ◽  
Air Bubbles

Remediation of sites contaminated with radioactive material such as Cs is important because of the risk posed to human health. Here, we report the effectiveness of water containing air bubbles with a diameter around 100 nm (nanobubbled water, NB water) for the removal of radioactive Cs. Laboratory experiments confirmed that NB water is more effective than purified water and as effective as water with neutral detergent in the removal of Cs-137 from gravel. Moreover, NB water retains its effectiveness even after storage for 7 d. Finally, NB water produced onsite from tap water was found to be effective for removal of radioactive Cs from gravel conglomerate in Fukushima, Japan.

A fluorescent aptasensor based on berberine for ultrasensitive detection of bisphenol A in tap water

2021 ◽  
Author(s):  
Yuxin Wei ◽  
Yangyang Zhou ◽  
Yanli Wei ◽  
Chuan Dong ◽  
Li Wang
Keyword(s):  
Bisphenol A ◽  
Human Health ◽  
Food Packaging ◽  
Tap Water ◽  
Water Systems ◽  
Ultrasensitive Detection ◽  
Its Analysis ◽  
Potential Impact ◽  
Fluorescent Aptasensor

The residues of bisphenol A (BPA) in food packaging and water systems have potential impact on human health, therefore, its analysis and detection has drawn people's attention. In this work,...

scholarly journals Pharmaceuticals in Tap Water: Human Health Risk Assessment and Proposed Monitoring Framework in China

2013 ◽  
Vol 121 (7) ◽  
pp. 839-846 ◽  
Author(s):  
Ho Wing Leung ◽  
Ling Jin ◽  
Si Wei ◽  
Mirabelle Mei Po Tsui ◽  
Bingsheng Zhou ◽  
...  
Keyword(s):  
Risk Assessment ◽  
Health Risk ◽  
Human Health ◽  
Health Risk Assessment ◽  
Tap Water ◽  
Human Health Risk ◽  
Human Health Risk Assessment ◽  
Monitoring Framework

Preliminary human health risk assessment of arsenic and fluoride in tap water from Zacatecas, México

2016 ◽  
Vol 188 (8) ◽  
Author(s):  
Mónica I. Martínez-Acuña ◽  
Marisa Mercado-Reyes ◽  
Jorge A. Alegría-Torres ◽  
José J. Mejía-Saavedra
Keyword(s):  
Risk Assessment ◽  
Health Risk ◽  
Human Health ◽  
Health Risk Assessment ◽  
Tap Water ◽  
Human Health Risk ◽  
Human Health Risk Assessment

scholarly journals Metallic and Microbial Contaminants in Drinking Water of Cankiri, Turkey

2012 ◽  
Vol 9 (2) ◽  
pp. 608-614 ◽  
Author(s):  
Emrah Caylak ◽  
Mustafa Tokar
Keyword(s):  
Drinking Water ◽  
Human Health ◽  
Water Samples ◽  
Tap Water ◽  
Total Coliform ◽  
Coliform Bacteria ◽  
Quality Of Water ◽  
Bacterial Indicator ◽  
Sewage Contamination ◽  
Microbial Contaminants

Safe and good quality drinking water is very important for human health. Water provides some heavy metals, such as As, B, Cd, Cn, Cr, Cu, F, Cl, Hg, Ni, Pb, Se, and Sn. These are undesirable substances dangerous to human health and cause chronic diseases and various cancers. Coliform bacteria are a commonly used bacterial indicator of sanitary quality of water.E. coli, total coliform and enterococci have been used as indicators of possible sewage contamination might pose a health risk. In this study, water samples were taken from thirty different waterworks in Cankiri, Turkey and metallic and microbial contaminants were investigated. In the drinking tap water samples have been found at concentrations exceeding the Turkish regulations (As and free Cl) and the WHO guidelines (As and B). Our results also indicate that significant microbiological contaminations were found above the guidelines for drinking waters given by the WHO, because of the fact that in the distribution of water is not appropriate.

Dynamic mechanical measurements on fresh-water ice during freezing and thawing: preliminary results

2003 ◽  
Vol 81 (1-2) ◽  
pp. 469-477
Author(s):  
E R Fitzgerald
Keyword(s):  
Fresh Water ◽  
Tap Water ◽  
Air Bubbles ◽  
Freezing And Thawing ◽  
Sinusoidal Vibration ◽  
Water Ice ◽  
Air Bubble ◽  
Dynamic Mechanical ◽  
Complex Shear ◽  
Shear Compliance

An automated measurement system for elastic (J' ) and viscous (J'' ) components of complex shear compliance, J* = J' – iJ'', and the elastic (G' ) and viscous (G'' ) components of complex shear modulus, G* = G' + iG'' = 1/J*, has been used to obtain these material parameters for fresh-water ice during freezing and thawing. The system is reviewed briefly and yields mechanical loss tangents, J''/J' = G''/G', the shear-wave velocity and attenuation, in addition to shear compliance and modulus, at sinusoidal vibration frequencies from 2 to 10 000 Hz at temperatures between –25 and 150°C. Results reported here are chiefly at temperatures from 10 to –10°C. The required sample disk pairs, which are clamped to a central drive plate, are prepared outside the apparatus for solids and gels. Liquids of known volume are inserted between the drive plate and surrounding clamps at a separation distance, h, by a syringe to form sample disks of area, A = Volume / h. Measurements at 58 frequencies between 2 and 10 000 Hz require 3.5 min; several measurements at each temperature were made to test for equilibrium. Results for both tap and distilled water above freezing revealed high values of elastic (J' ) compliance that decreased sharply at 100 Hz and higher frequencies. Tap-water samples with 4 to 6% by volume air bubbles were less compliant ("stiffer") above freezing than samples with 0 to 1% by volume air, but when frozen, the samples with the smaller volume of air bubbles were less compliant, that is, had higher modulus values than the samples with high air-bubble volumes. Dynamic mechanical property changes in the transition from water to ice are compared to changes previously found during phase transitions in other materials. Further investigation on the effects of air-bubble volumes on dynamic mechanical properties of both water and ice is planned. PACS Nos.: 62.30+d, 62.40+i

scholarly journals The effect of active charcoal filter on viability of bacteria isolated from the tap water in Sarajevo

2020 ◽  
Vol 2 (2) ◽  
pp. 100-107
Author(s):  
Merjema Ikanović ◽  
Mevlan Iseni ◽  
Muhamed Adilović ◽  
Altijana Hromić-Jahjefendić
Keyword(s):  
Water Sample ◽  
Human Health ◽  
Bosnia And Herzegovina ◽  
Tap Water ◽  
Independent Study ◽  
Active Charcoal ◽  
Clean Water ◽  
Colony Forming Unit ◽  
Number Of Bacteria ◽  
Charcoal Filter

Clean water is essential to our existence and problems might arise when it becomes contaminated with different pathogens, which might pose a threat to human health. Tap water is generally considered drinkable since it passes different forms of disinfection during processing. Some households have additional disinfection procedures, the most common one being the usage of charcoal filters, in order to further clean the tap water from both undesirable solvents and microorganisms. In the first independent study of this kind, we have tested tap water for bacteria from five different locations in Sarajevo, and we have tested the efficiency of charcoal filter in trapping of bacteria. According to regulations in Bosnia and Herzegovina, there should be 1 colony forming unit (CFU) per 50ul of water sample, which was satisfied in only one location from Sarajevo, while one had significantly higher levels (6.7, p val. 0.0148). Overall, the charcoal filter has decreased the number of bacteria in the water, with the exception of one sample.

scholarly journals Short communication: Detection of selected agricultural pesticides in river and tap water in Letsitele, Lomati and Vals–Renoster catchments, South Africa

Water SA ◽  
2019 ◽  
Vol 45 (4 October) ◽  
Author(s):  
M Machete ◽  
JM Shadung
Keyword(s):  
South Africa ◽  
Human Health ◽  
Health Risks ◽  
Tap Water ◽  
Epidemiological Studies ◽  
Health And Environmental Effects ◽  
Potential Health ◽  
High Exposure ◽  
Agricultural Pesticides ◽  
Catchment Areas

This paper presents the levels of detection of selected agricultural pesticides in river and tap water in the Letsitele, Lomati and Vals–Renoster catchments, South Africa. Agriculture plays a major role in the development of communities through job creation and poverty eradication. However, exposure to agricultural pesticides can result in serious human health and environmental effects. This study, therefore, identified critical areas where specific pesticides might result in high environmental and human health risks. Three water catchment areas, namely, Letsitele, Lomati and Vals–Renoster, were identified for raw and tap water analysis. The results confirmed the presence of selected agricultural pesticides:  atrazine, terbuthylazine, imidacloprid, metolachlor, simazine and alachlor. Although low concentrations of most of these pesticides were detected, pesticides such as atrazine, alachlor and simazine are known for endocrine disruption. A critical finding of this study is the detection of these pesticides in tap water (drinking water) of a primary school in the Lomati catchment. This reveals a high exposure potential for human health. It is thus recommended that further research be conducted to determine the potential health risks associated with these pesticides among vulnerable communities, through epidemiological studies.

scholarly journals Removal of Nitrate and Hexavalent Chromium from Groundwater Using Zerovalent Iron – A Laboratory Study

2010 ◽  
Vol 67 (2) ◽  
Author(s):  
Cristina MODROGAN ◽  
Alexandra MIRON ◽  
Oanamari ORBULET ◽  
Cristina COSTACHE
Keyword(s):  
Heavy Metals ◽  
Groundwater Contamination ◽  
Human Health ◽  
Hexavalent Chromium ◽  
Removal Efficiency ◽  
Laboratory Study ◽  
Nitrate Reduction ◽  
Laboratory Experiments ◽  
Zerovalent Iron ◽  
Inorganic Pollutants

. Groundwater contamination by inorganic pollutants such as heavy metals, chromium and nitrate has recently begun to attract widespread interests because of significant threat to human health. Nitrate and chromate are most frequently detected contaminants in groundwater. In this paper, we describe a series of laboratory experiments which quantify the rate of chromium (Cr6+) and nitrate reduction by Fe0. The main goal of these experiments was to determine the removal efficiency of chromium (Cr6+) and nitrate ions using iron. The results indicate that in the presence of zero valence iron Cr6+ reduces to Cr3+, and NO3- to NH4+.

scholarly journals Human health risk assessment of trace elements in drinking tap water in Zahedan city, Iran

2019 ◽  
Vol 17 (2) ◽  
pp. 1163-1169 ◽  
Author(s):  
Mohadeseh Dashtizadeh ◽  
Hossein Kamani ◽  
Seyed Davoud Ashrafi ◽  
Ayat Hossein Panahi ◽  
Amir Hossein Mahvi ◽  
...  
Keyword(s):  
Risk Assessment ◽  
Trace Elements ◽  
Health Risk ◽  
Human Health ◽  
Health Risk Assessment ◽  
Tap Water ◽  
Human Health Risk ◽  
Human Health Risk Assessment
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