scholarly journals Quality Assessment of Groundwater in the Vicinity of Coir Retting Areas of Kadinamkulam Estuary, South India

2020 ◽  
pp. 118-128
Author(s):  
Sonu Sasidharan ◽  
D. S. Jaya
Keyword(s):  
Hydrogen Sulfide ◽  
Water Samples ◽  
Anthropogenic Activities ◽  
Principal Component ◽  
Chemical Characteristics ◽  
Residential Areas ◽  
Physico Chemical ◽  
Sulfide Content ◽  
Calcium Magnesium ◽  
Hydrogen Sulfide Content

The present study was conducted in the selected groundwater bodies of the coastal gramapanchayath near Kadinamkulam estuary during the pre-monsoon, monsoon, and post-monsoon seasons. Kadinamkulam estuary is one of the major coir-retting areas in Kerala. The major objective of the study is to assess the physico- chemical characteristics and hydrogen sulfide pollution of groundwater in the residential areas of Azhoor Gramapanchayath in Thiruvananthapuram district. Surface water samples from selected stations were also collected from the Kadinamkulam estuary. The physico-chemical characteristics of water were analyzed following the standard procedures in APHA (2012). The results show that the recorded values for color, pH, phosphate, calcium, magnesium and hydrogen sulfide were above the permissible limits of drinking water quality standards (Bureau of Indian Standards, 1991; WHO, 1993, 1996). This may be due leaching of effluents from the coir retting activity in the Kadinamkulam estuary and due to the disposal of solid wastes. The study also revealed that the hydrogen sulfide content was high in lake water samples which affect the primary productivity of the water body. The correlation and principal component analysis shows that color is an important parameter and from cluster, analysis it was found that phosphate and hydrogen sulfide content significantly affect the groundwater quality. The study concludes that the groundwater sources in the study area are getting contaminated due to the leaching of pollutants from Kadinamkulam estuary and anthropogenic activities in the nearby residential areas.

scholarly journals Spatial Distribution of Fluoride in Drinking Water in Dhamar City, Yemen

2021 ◽  
Vol 10 (1) ◽  
pp. 49-63
Author(s):  
Hefdhallah Al Aizari ◽  
Rachida Fegrouche ◽  
Ali Al Aizari ◽  
Saeed S. Albaseer
Keyword(s):  
Drinking Water ◽  
Anthropogenic Activities ◽  
Groundwater Resources ◽  
Principal Component ◽  
World Health ◽  
Residential Areas ◽  
Central Plateau ◽  
The World ◽  
Pca Method ◽  
Health Organization

The fact that groundwater is the only source of drinking water in Yemen mandates strict monitoring of its quality. The aim of this study was to measure the levels of fluoride in the groundwater resources of Dhamar city. Dhamar city is the capital of Dhamar governorate located in the central plateau of Yemen. For this purpose, fluoride content in the groundwater from 16 wells located around Dhamar city was measured. The results showed that 75% of the investigated wells contain fluoride at or below the permissible level set by the World Health Organization (0.5 – 1.5 mg/L), whereas 25% of the wells have relatively higher fluoride concentrations (1.59 – 184 mg/L). The high levels of fluoride have been attributed to the anthropogenic activities in the residential areas near the contaminated wells. Interestingly, some wells contain very low fluoride concentrations (0.30 – 0.50 mg/L).  Data were statistically treated using the principal component analysis (PCA) method to investigate any possible correlations between various factors. PCA shows a high correlation between well depth and its content of fluoride. On the other hand, health problems dominating in the study area necessitate further studies to investigate any correlation with imbalanced fluoride intake.

Hydrogen sulfide content in pregnant women with preeclampsia in late gestation and their newborns

2021 ◽  
Vol 66 (7) ◽  
pp. 396-400
Author(s):  
Irina Gennadievna Popova ◽  
O. G. Sitnikova ◽  
S. B. Nazarov ◽  
R. I. Sadov ◽  
I. A. Panova ◽  
...  
Keyword(s):  
Hydrogen Sulfide ◽  
Late Gestation ◽  
Control Group ◽  
Uncomplicated Pregnancy ◽  
Hypertensive Disorders ◽  
Sulfide Content ◽  
Postnatal Adaptation ◽  
Group 2 ◽  
Hydrogen Sulfide Content ◽  
Group 1

We examined 70 women who were 22-40 weeks pregnant and their newborns. Of these, 15 women with moderate PE made up group 1, 22 women with severe PE-group 2, and 55 women with uncomplicated pregnancy without hypertensive disorders - the control group. Blood was collected from women when they were admitted to the clinic, and blood was taken from newborns for 3-5 days of life. The concentration of hydrogen sulfide was determined by the method of K. Qu et al [17]. There was a decrease in the level of hydrogen sulfide in the blood serum of women whose pregnancy was complicated by severe preeclampsia. In newborns born to mothers with preeclampsia, an increase in the concentration of hydrogen sulfide was detected in the blood, which is probably a compensatory reaction aimed at restoring vascular homeostasis during early postnatal adaptation.

scholarly journals Multisensory System Used for the Analysis of the Water in the Lower Area of River Danube

Nanomaterials ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 891 ◽  
Author(s):  
Constantin Apetrei ◽  
Catalina Iticescu ◽  
Lucian Puiu Georgescu
Keyword(s):  
Data Analysis ◽  
Natural Water ◽  
Water Samples ◽  
Multivariate Data Analysis ◽  
Multivariate Data ◽  
Principal Component ◽  
Cyclic Voltammograms ◽  
Physico Chemical ◽  
Multisensory System ◽  
Collection Point

The present paper describes the development of a multisensory system for the analysis of the natural water in the Danube, water collected in the neighboring area of Galati City. The multisensory system consists of a sensor array made up of six screen-printed sensors based on electroactive compounds (Cobalt phthalocyanine, Meldola’s Blue, Prussian Blue) and nanomaterials (Multi-Walled Carbon Nanotubes, Multi-Walled Graphene, Gold Nanoparticles). The measurements with the sensors array were performed by using cyclic voltammetry. The cyclic voltammograms recorded in the Danube natural water show redox processes related to the electrochemical activity of the compounds in the water samples or of the electro-active compounds in the sensors detector element. These processes are strongly influenced by the composition and physico-chemical properties of the water samples, such as the ionic strength or the pH. The multivariate data analysis was performed by using the principal component analysis (PCA) and the discriminant factor analysis (DFA), the water samples being discriminated according to the collection point. In order to confirm the observed classes, the partial least squares discriminant analysis (PLS-DA) method was used. The classification of the samples according to the collection point could be made accurately and with very few errors. The correlations established between the voltammetric data and the results of the physico-chemical analyses by using the PLS1 method were very good, the correlation coefficients exceeding 0.9. Moreover, the predictive capacity of the multisensory system is very good, the differences between the measured and the predicted values being less than 3%. The multisensory system based on voltammetric sensors and on multivariate data analysis methods is a viable and useful tool for natural water analysis.

The Research on Influence Factors and Control of Hydrogen Sulfide during Steam Drive

2014 ◽  
Vol 962-965 ◽  
pp. 736-740
Author(s):  
Feng Yan
Keyword(s):  
Hydrogen Sulfide ◽  
Experimental Studies ◽  
Influence Factors ◽  
Chemical Agent ◽  
Content Increase ◽  
Prevention Measures ◽  
Steam Drive ◽  
Rate Of Increase ◽  
Sulfide Content ◽  
Hydrogen Sulfide Content

This project carries out the research on influence factors of wells producing hydrogen sulfide in connection with the actual situation of producing hydrogen sulfide in Qi-40 steam drive process. Experimental studies have shown that: A. temperature is the main external factors of produce hydrogen sulfide, It will produce hydrogen sulfide when temperature is above 100°C, hydrogen sulfide content increase about 300ppm in average when the temperature increase per 20°C; hydrogen sulfide content will be in the greatest increase when temperature at the range of 160°C~180°C; the rate of increase in the levels of hydrogen sulfide will significantly reduce when temperature above 180 °C.B. Adding Chemical agent with surface activity can inhibit the release of hydrogen sulfide. C. Adding acid chemical agent will make the content of hydrogen sulfide increase. The experimental study also investigated hydrogen sulfide prevention measures.

scholarly journals Physico-chemical trends in the sediments of Agbede Wetlands, Nigeria

2017 ◽  
Vol 64 (2) ◽  
pp. 111-126
Author(s):  
Abdul-Rahman Dirisu ◽  
John Ovie Olomukoro ◽  
Ifeanyi Maxwell Ezenwa
Keyword(s):  
Alkali Metals ◽  
Anthropogenic Activities ◽  
Sediment Quality ◽  
Principal Component ◽  
Mean Values ◽  
Physico Chemical ◽  
Lotic System ◽  
The Mean ◽  
And Cluster Analysis ◽  
Chemical Trends

AbstractThis study assessed the physico-chemical status of sediments in the Agbede Wetlands with the aim to create a reference archive for the Edo North catchment and to further identify the characteristics mostly influenced by the natural and anthropogenic activities going on at the watershed. Nutrients, zinc, nickel and lead were identified to be mostly of anthropogenic origin, while alkali metals and alkaline earth metals were from both anthropogenic and natural sources. The clustering of stations 1 and 4 indicates that the sediment quality in the lentic systems was not completely excluded from the lotic system, suggesting that principal component analysis (PCA) and cluster analysis (CA) techniques are invaluable tools for identifying factors influencing the sediment quality. The mean values of the particle size distribution were in the following order across the ecosystems: sand (61.86–80.53%) > silt (9.75–30.34%) > clay (7.83–13.89%). The contamination of the water bodies was primarily derived from agricultural run-offs and through geochemical weathering of the top soils. Therefore, our analysis indicates that the concentrations of cations, anions and nutrients in the sediments of the lotic and lentic ecosystems in Agbede Wetlands are not at an alarming level.

scholarly journals Assessment of Physico-Chemical Characteristics of Wastewater from Dairy industry

2021 ◽  
Vol 9 (5) ◽  
pp. 570-575
Keyword(s):  
Waste Water ◽  
Water Samples ◽  
Dairy Industry ◽  
Raw Milk ◽  
Wastewater Effluent ◽  
Chemical Characteristics ◽  
Waste Generation ◽  
Chemical Parameters ◽  
Physico Chemical ◽  
Ecological Problems

The present work is aimedto analyze Physico-Chemical parameters of wastewater effluent from a dairy industry in Chennai. The dairy industry which was taken for study purpose involves processing of raw milk into products like consumer milk, butter, cheese, ice-cream’s and other milk products.Considering the increased milk demand, the dairy industry in India is expected to grow speedily and have the waste generation and related ecological problems are also assumed increased importance. An attempt has been made to study the Physico-chemical characteristics of waste water generated from dairy industry near Chennai in Tamilnadu state of India. Waste water samples werecollected from the dairy industry and analyzed for pH, EC, TSS, NO3-, PO4, Cl-, Fe, BOD, COD, oil & grease

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