scholarly journals A contamination assessment of the CI carbonaceous meteorite Orgueil using a DNA-directed approach

2016 ◽  
Vol 51 (5) ◽  
pp. 920-931 ◽  
Author(s):  
J. W. Aerts ◽  
A. Elsaesser ◽  
W. F. M. Röling ◽  
P. Ehrenfreund
Keyword(s):  
Contamination Assessment ◽  
Carbonaceous Meteorite

Data Center Equipment Reliability Concerns—Contamination Issues, Standards Actions, and Case Studies

2013 ◽  
Author(s):  
Chris Muller ◽  
Chuck Arent ◽  
Henry Yu
Keyword(s):  
Case Studies ◽  
Data Center ◽  
Data Centers ◽  
Electronic Equipment ◽  
Circuit Board ◽  
Lead Free ◽  
Reliable Operation ◽  
Contamination Assessment ◽  
Equipment Reliability ◽  
Equipment Failures

Abstract Lead-free manufacturing regulations, reduction in circuit board feature sizes and the miniaturization of components to improve hardware performance have combined to make data center IT equipment more prone to attack by corrosive contaminants. Manufacturers are under pressure to control contamination in the data center environment and maintaining acceptable limits is now critical to the continued reliable operation of datacom and IT equipment. This paper will discuss ongoing reliability issues with electronic equipment in data centers and will present updates on ongoing contamination concerns, standards activities, and case studies from several different locations illustrating the successful application of contamination assessment, control, and monitoring programs to eliminate electronic equipment failures.

Soil contamination assessment and potential sources of heavy metals of alpu plain Eskişehir Turkey

2021 ◽  
pp. 1-9
Author(s):  
Kadriye Taşpınar ◽  
Özgür Ateş ◽  
Melis Özge Pınar ◽  
Gülser Yalçın ◽  
Fatih Kızılaslan ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Soil Contamination ◽  
Contamination Assessment ◽  
Potential Sources

Spatial distribution and contamination assessment of heavy metals in surface sediments of Lake Burullus, Egypt

2021 ◽  
Vol 14 (1) ◽  
Author(s):  
Mohamed E. A. El-Metwally ◽  
Dina H. Darwish ◽  
Mahmoud A. Dar
Keyword(s):  
Heavy Metals ◽  
Spatial Distribution ◽  
Surface Sediments ◽  
Contamination Assessment ◽  
Lake Burullus

scholarly journals Geophagic Clays from Cameroon: Provenance, Metal Contamination and Health Risk Assessment

2021 ◽  
Vol 18 (16) ◽  
pp. 8315
Author(s):  
Georges-Ivo Ekosse ◽  
George Elambo Nkeng ◽  
Nenita Bukalo ◽  
Olaonipekun Oyebanjo
Keyword(s):  
Health Risk ◽  
Inductively Coupled Plasma ◽  
Risk Index ◽  
Human Health Risk ◽  
Carcinogenic Risk ◽  
Anthropogenic Sources ◽  
Contamination Assessment ◽  
X Ray ◽  
Inductively Coupled ◽  
Plasma Mass Spectrometry

This study assessed the mineralogical and geochemical characteristics of geophagic clays sold in some markets in Cameroon to ascertain their provenance, contamination status and human health risk. To achieve this, 40 samples from 13 markets in Cameroon were purchased and analysed using X-ray diffractometry, X-ray fluorescence and laser ablation inductively coupled plasma mass spectrometry for their mineralogy and geochemistry, respectively. The geophagic clays were dominantly made up of kaolinite and quartz. Their chemistry was dominated by SiO2, Al2O3 and LOI with means of 48.76 wt%, 32.12 wt% and 13.93 wt%, respectively. The major, trace and rare earth elements data showed that these geophagic clays were predominantly derived from felsic rocks. The contamination assessment indicated no enrichment of metals from anthropogenic sources, except for Zn in samples from Acacia, Madagascar and Mfoudi markets. The index of geo-accumulation indicated no contamination to moderate contamination of the clays. The non-carcinogenic index values for Fe, Co, Cr, Cu, Ni, Pb and Zn were generally less than 1, suggesting no non-carcinogenic risk exposure to children and adults consuming the geophagic clays from these metals. The carcinogenic risk index (TCR) for Ni and Cr were above 10−6, which implies that children and adults are vulnerable to minimal carcinogenic health risk. The TCR values from Ni posed the highest risk, especially to children consuming clays from some markets.

RARE EARTH AND OTHER ABUNDANCES IN THE MURCHISON CARBONACEOUS METEORITE

Meteoritics ◽  
1972 ◽  
Vol 7 (3) ◽  
pp. 295-301 ◽  
Author(s):  
D. L. Showalter ◽  
H. Wakita ◽  
R. A. Schmitt
Keyword(s):  
Rare Earth ◽  
Carbonaceous Meteorite

scholarly journals Erratum to: Contamination assessment of ecotoxic metals in recent sediments from the Ergene River, Turkey

2017 ◽  
Vol 76 (2) ◽  
Author(s):  
E. Sari ◽  
N. Cukrov ◽  
S. Frančišković-Bilinski ◽  
M. A. Kurt ◽  
M. Hallı
Keyword(s):  
Contamination Assessment ◽  
Recent Sediments

Assessing Soil and Plant Pollution by Abandoned Rural Waste Dumping Sites in Ningbo, China

2011 ◽  
Vol 138-139 ◽  
pp. 1149-1155 ◽  
Author(s):  
Yi Dong Guan ◽  
Ye Hong Du ◽  
Zhen Dong Li ◽  
An Cheng Luo
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Reference Value ◽  
Dry Weight ◽  
Rice Grain ◽  
Contamination Assessment ◽  
Plant Parts ◽  
Metal Contents ◽  
Plant Pollution

This paper reports the concentration of heavy metals (Cr, Cu, Zn, Cd and Pb) in the soils and rices surrounding the abandoned rural waste dumping sites in Ningbo. Igeo (geoaccumulation index) was calculated to assess the contamination degree of heavy metals in soils. The mean contents of Cr, Cu, Cd, Zn and Pb of soils were 33.3, 24.1, 1.5, 118.9 and 45.6 mg/(kg DW) (dry weight), respectively. All of them were much higher than that of the reference value (i.e. CK), but there were no coherent trend of the metal contents within 1-120m distance from the dumping site. Igeo of heavy metals reveals the order of Cd>Cu>Cr>Pb>Zn, and the contamination assessment of soils using Igeo indicate the moderate Cd pollution, while the soils were unpolluted-moderately overall by Cr, Cu, Zn as well as Pb. The heavy metal contents in root, stem & leaf and rice grains were all remarkable higher than that of the CK at 20-120 m distances, and the heavy metal contents in root were evidently much higher than other plant parts, while those in rice grain were lowest, indicating the great bioaccumulation trend of heavy metals. Although the metal contents in the rice grain were within the legislation limit, its bioaccumulation trend of heavy metals was remarkable, whose contents were 4.38-fold for Cr, 1.76-fold for Cu, 1.28-fold for Zn, 2.67-fold for Cd and 3.03-fold for Pb higher than that of reference value, respectively. Finally, we proposed a decentralized in-situ restoration approach for the dumping sites.

Microplastic contamination assessment in water and economic fishes in different trophic guilds from an urban water supply reservoir after flooding

2021 ◽  
Vol 299 ◽  
pp. 113667
Author(s):  
Jiajun Wu ◽  
Zhongguan Jiang ◽  
Yunzhao Liu ◽  
Xianfu Zhao ◽  
Yangyang Liang ◽  
...  
Keyword(s):  
Water Supply ◽  
Urban Water ◽  
Trophic Guilds ◽  
Urban Water Supply ◽  
Contamination Assessment ◽  
Water Supply Reservoir
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