Spatio-Temporal Analysis of Natural and Anthropogenic Arsenic Sources in Groundwater Flow Systems

The presence of arsenic in groundwater constitutes a hazard for the environment and human health, and the determination of its source has become a global challenge, which can be approached by defining the natural background levels (NBL) in conjunction with the indicator kriging method, with the aim of delineating anthropogenically contaminated areas. However, having a unique value of NBL for large areas can generate interpretation errors. This research integrates the determination of the flow systems present in the Calera Aquifer, and the definition of the natural background levels in each flow system by making estimation maps in ArcGIS using two databases, 10 years apart, to evaluate the spatio-temporal variation of arsenic in groundwater. The results indicate a notable increase in the probability of exceeding the arsenic NBL, mainly in the intermediate flow, which may be due to movement resulting from mining activities as well as a mixture of regional and intermediate flows caused by the extraction of water for agriculture and drinking water supplies. The presented values exceed the maximum limits allowed for human consumption, as stated by the World Health Organization.

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Spatio-temporal analysis and determination of the ecological niche model of Giardia Lamblia (Lambl, 1859) in Ardabil province, northwestern Iran

Journal of Parasitic Diseases ◽

10.1007/s12639-020-01343-0 ◽

2021 ◽

Author(s):

Hafez Mirzanejad-Asl ◽

Afshin Karimi ◽

Navid Babaei pouya ◽

Eslam Moradi-Asl

Keyword(s):

Giardia Lamblia ◽

Ecological Niche ◽

Temporal Analysis ◽

Ecological Niche Model ◽

Niche Model ◽

Northwestern Iran ◽

Spatio Temporal

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HEAVY METAL CONTENT IN SOME SEAFOODS COLLECTED FROM MUARA ANGKE FISH AUCTION PLACE, JAKARTA.

Marine Research in Indonesia ◽

10.14203/mri.v26i1.407 ◽

1987 ◽

Vol 26 ◽

pp. 51-58

Author(s):

Horas Hutagalung ◽

Suwirma Syamsu

Keyword(s):

Heavy Metals ◽

Heavy Metal ◽

Metal Content ◽

Heavy Metal Content ◽

World Health ◽

Human Consumption ◽

Zn Content ◽

Standard Set ◽

Health Organization

Determination of heavy metal content (Hg, Pb, Cd, Cu, Cr, Zn) in some seafoods collected from Muara Angke Fish Auction Place were carried out during February to July 1979. The results showed that Zn content in seafoods a nalyzed was always much higher than the other heavy metals. The concentration levels of the six heavy metals observed were low. It is almost of the same level as the metal concentration of other seafoods observed in various parts of the world oceans, but still lower than the maximum standard set for human consumption as established by Tasmania, Australia and World Health Organization. The mean per capita consumption of fish in Jakarta is only about 165 g per week, while the Provisional Tolerated Weekly Intake for Hg, set by WHO/FAO at 300 ug level, would be attained by consuming 1500 g Rastrelliger sp., or 698 gPenaeus setiferus, or 545 g Sepia sp., and or 1250 g Pecten sp. Therefore, at present the level of metal content in fishes sold at TPI Muara Angke can be considered as not dangerous to human health as long as these quantities are not surpassed.

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Hydrogeochemical characterization and determination of natural background levels (NBL) in groundwater within the main lithological units in Slovenia

Environmental Earth Sciences ◽

10.1007/s12665-020-09112-1 ◽

2020 ◽

Vol 79 (15) ◽

Cited By ~ 3

Author(s):

Luka Serianz ◽

Sonja Cerar ◽

Mojca Šraj

Keyword(s):

Natural Background ◽

Background Levels ◽

Hydrogeochemical Characterization

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Evaluating the anthropogenic impacts on groundwaters; a methodology based on the determination of natural background levels and threshold values

Environmental Earth Sciences ◽

10.1007/s12665-012-1664-5 ◽

2012 ◽

Vol 67 (8) ◽

pp. 2223-2237 ◽

Cited By ~ 19

Author(s):

Alexandra Gemitzi

Keyword(s):

Anthropogenic Impacts ◽

Threshold Values ◽

Natural Background ◽

Background Levels

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Spatio-temporal analysis of the development of the COVID-19 epidemic (pandemic) in Poland: First phase of development

Geographia Polonica ◽

10.7163/gpol.0208 ◽

2021 ◽

Vol 94 (3) ◽

pp. 325-354

Author(s):

Jerzy Parysek ◽

Lidia Mierzejewska

Keyword(s):

Development Process ◽

Temporal Analysis ◽

Spatial Dimension ◽

Regional Differentiation ◽

Retirement Age ◽

Material Base ◽

Time Dimension ◽

Spatio Temporal ◽

Degree Of Similarity

The purpose of this study is to present a description of the course of the COVID-19 epidemic in Poland in the space-time dimension in the period from March 15th to August 8th 2020. The result of the conducted research is a presentation of the regional differentiation of the course of the epidemic in Poland, the comparison of the intensity of SARS-CoV-2 infections in particular voivodeships, the determination of the degree of similarity in the course of the pandemic development process in individual regions (voivodeships) of the country, and also the indication of the factors which could be taken into account when attempting to explain the interregional differences in the course of the epidemic. The conducted research shows, among other things, that: (1) in terms of time, the development of the epidemic was generally monotonic, however the increase in new infections was rather cyclical, (2) in the spatial dimension, the development of the epidemic was rather random, although the greatest number of infections was characteristic of the most populated regions of the country, (3) the level of infections in Poland was mainly positively influenced by: population density, working in industry, people beyond retirement, age as well as a poorly developed material base of inpatient care.

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