Seasonal assessment of metal trace element contamination by PCA in Seybouse wadi (Algeria)

2018 ◽  
Vol 18 (6) ◽  
pp. 1897-1905 ◽  
Author(s):  
S. Khaled-Khodja ◽  
S. Cherif ◽  
Gaël Durand
Keyword(s):  
Principal Component Analysis ◽  
Trace Element ◽  
Mediterranean Sea ◽  
Principal Component ◽  
Component Analysis ◽  
Metallic Elements ◽  
Metal Trace ◽  
The Mediterranean ◽  
Trace Element Contamination ◽  
Clear Relation

Abstract The seasonal assessment of trace metallic elements in Seybouse wadi waters and sediments is performed by principal component analysis (PCA). This wadi is the second of Algeria considering its length and vast basin, and opens into the coastline of Annaba in the Mediterranean Sea. Monitoring mineral micropollutants showed that waters are primarily contaminated by aluminum Al, selenium Se, zinc Zn, copper Cu, chromium Cr, lead Pb, cadmium Cd and arsenic As, whereas sediments are essentially soiled by arsenic As, chromium Cr and nickel Ni. PCA shows a clear relation between the season and the type of metallic contamination, and it also helps in understanding its origins.

scholarly journals Characterization of Ambient Particulate Matters in an Industry-Intensive Area in Central Taiwan

Atmosphere ◽  
2021 ◽  
Vol 12 (7) ◽  
pp. 926
Author(s):  
Hsing-Wang Li ◽  
Kang-Shin Chen ◽  
Chia-Hsiang Lai ◽  
Ting-Yu Chen ◽  
Yi-Ching Lin ◽  
...  
Keyword(s):  
Principal Component Analysis ◽  
Principal Component ◽  
Component Analysis ◽  
Water Soluble ◽  
High Tech ◽  
Particulate Matters ◽  
Metallic Elements ◽  
Soluble Ions ◽  
Water Soluble Ions ◽  
Central Taiwan

Atmospheric particulate matters (PMs) were measured in an industry-intensive region in central Taiwan in order to investigate the characteristics and possible sources of PMs. The samplings were simultaneously conducted using a 10- and 3-stage Micro Orifice Uniform Deposit Impactor (MOUDI) from 2017 to 2018. In this study, the characteristics of PMs in this region were evaluated by measuring the mass concentration of PMs and analyzing water-soluble ions and metallic elements, as well as dioxins. Additionally, principal component analysis (PCA) was used to identify the potential sources of PMs. The results showed that the mean concentration of coarse (>1.8 μm), fine (0.1–1.8 μm), and ultrafine (<0.1 μm) particles were 13.60, 14.38, and 3.44 μg/m3, respectively. In the industry-intensive region, the size distribution of ambient particles showed a bi-modal distribution with a high concentration of coarse particles in the spring and summer, while fine particles were dominant in the autumn and winter. The most abundant water-soluble ions of PMs were NO3−, Cl−, and SO42−, while the majority of metallic elements were Na, Fe, Ca, Al, and Mg in different particle sizes. The results of Pearson’s correlation analysis for metals indicated that the particles in the collected air samples were related to the iron and steelmaking industries, coal burning, vehicle exhausts, and high-tech industries. The dioxin concentration ranged from 0.0006 to 0.0017 pg I-TEQ/Nm3. Principal component analysis (PCA) revealed that the contribution to PMs was associated with sea salt, secondary pollutants, and industrial process.

Atmospheric trace element deposition: Principal component analysis of ICP-MS data from moss samples

1995 ◽  
Vol 88 (1) ◽  
pp. 67-77 ◽  
Author(s):  
Torunn Berg ◽  
Oddvar Røyset ◽  
Eiliv Steinnes ◽  
Marit Vadset
Keyword(s):  
Principal Component Analysis ◽  
Trace Element ◽  
Principal Component ◽  
Component Analysis ◽  
Icp Ms

scholarly journals Association Between Dietary Pattern and Perceived Stress

2021 ◽  
Vol 5 (Supplement_2) ◽  
pp. 430-430
Author(s):  
Casey McKenna ◽  
Gerard Dempsey ◽  
Michael Colabelli ◽  
Tharsana Kumarasivam ◽  
Rachel Molzon ◽  
...  
Keyword(s):  
Principal Component Analysis ◽  
Stress Response ◽  
Mediterranean Diet ◽  
Perceived Stress ◽  
Dietary Patterns ◽  
Dietary Pattern ◽  
Healthy Lifestyle ◽  
Principal Component ◽  
Component Analysis ◽  
The Mediterranean

Abstract Objectives Recent evidence is pointing toward the effect of nutrients on neurotransmission. Therefore, dietary patterns may impact the stress response as well as mental wellbeing. This study aims to investigate the relationship between dietary patterns and perceived stress as a way to shed light on the impact of diet quality on psychological stress. Methods An anonymous questionnaire combining three validated scales was distributed through several social media platforms. The questionnaire included the Food-Mood Questionnaire, the Perceived Stress Scale, and the Kessler-6 scale as well as questions assessing frequency of consumption of various tyrosine-rich foods. Inclusion criteria included adults 18 years old or older. Results were analyzed using Spearman's Rho correlation and principal component analysis using SPSS Version 24.0. Results Our results indicated that several components of the Mediterranean diet such as whole grains (P &lt; 0.05), dark green leafy vegetables (P &lt; 0.01), fish (P &lt; 0.01), beans (P &lt; 0.05), and red lean meat (P &lt; 0.01) were negatively correlated with perceived stress total score. Fast food was positively correlated with perceived stress total score (P &lt; 0.01). The principal component analysis identified 3 components: a healthy dietary pattern, a healthy lifestyle, and an unhealthy dietary pattern. Interestingly, a healthy lifestyle, which shared multiple components with the Mediterranean diet, was inversely related to perceived stress total score and mental distress total score. Conclusions Our findings suggest that a dietary pattern similar to the Mediterranean diet may be associated with a lower perceived stress response. Funding Sources None.

A German version of the Intermittent Claudication Questionnaire (ICQ): cultural adaptation and validation

VASA ◽  
2012 ◽  
Vol 41 (5) ◽  
pp. 333-342 ◽  
Author(s):  
Kirchberger ◽  
Finger ◽  
Müller-Bühl
Keyword(s):  
Principal Component Analysis ◽  
Intermittent Claudication ◽  
Completion Time ◽  
Short Form ◽  
Principal Component ◽  
Component Analysis ◽  
German Version ◽  
Average Completion Time ◽  
Sf 36 ◽  
Related Quality

Background: The Intermittent Claudication Questionnaire (ICQ) is a short questionnaire for the assessment of health-related quality of life (HRQOL) in patients with intermittent claudication (IC). The objective of this study was to translate the ICQ into German and to investigate the psychometric properties of the German ICQ version in patients with IC. Patients and methods: The original English version was translated using a forward-backward method. The resulting German version was reviewed by the author of the original version and an experienced clinician. Finally, it was tested for clarity with 5 German patients with IC. A sample of 81 patients were administered the German ICQ. The sample consisted of 58.0 % male patients with a median age of 71 years and a median IC duration of 36 months. Test of feasibility included completeness of questionnaires, completion time, and ratings of clarity, length and relevance. Reliability was assessed through a retest in 13 patients at 14 days, and analysis of Cronbach’s alpha for internal consistency. Construct validity was investigated using principal component analysis. Concurrent validity was assessed by correlating the ICQ scores with the Short Form 36 Health Survey (SF-36) as well as clinical measures. Results: The ICQ was completely filled in by 73 subjects (90.1 %) with an average completion time of 6.3 minutes. Cronbach’s alpha coefficient reached 0.75. Intra-class correlation for test-retest reliability was r = 0.88. Principal component analysis resulted in a 3 factor solution. The first factor explained 51.5 of the total variation and all items had loadings of at least 0.65 on it. The ICQ was significantly associated with the SF-36 and treadmill-walking distances whereas no association was found for resting ABPI. Conclusions: The German version of the ICQ demonstrated good feasibility, satisfactory reliability and good validity. Responsiveness should be investigated in further validation studies.

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