scholarly journals Estimation of Mercury in Soil, Water and Plants Spectrophotometrically

2019 ◽  
Vol 35 (6) ◽  
pp. 1718-1721
Author(s):  
Shawnam Omar Abdullah ◽  
Qasim Yahya Mohammed
Keyword(s):  
Stannous Chloride ◽  
Simple Procedure ◽  
Mercury Level ◽  
Environmental Water ◽  
Soil Samples ◽  
Agricultural Products ◽  
Kurdistan Region ◽  
Acidic Media ◽  
Spectrophotometric Measurement ◽  
Solvent Purification

Trace levels of mercury in soil, environmental water (portable and polluted) and plant specimens (cucumber and pepper) at Koya area – Kurdistan region – Iraq was described by simple procedure, where, no further solvent purification or pre-concentration required steps. The method based on soxhelt extraction with oxalic acid and stannous chloride in acidic media for about 2.5 h, followed by spectrophotometric measurement at λmax of 300 nm. The results show different mercury levels, water samples show (3-215) ppm, while soil samples (5 -150) ppm. Also, some agricultural products show (23 -80) ppm mercury level.

scholarly journals Detection of Small Numbers of Campylobacter jejuni and Campylobacter coli Cells in Environmental Water, Sewage, and Food Samples by a Seminested PCR Assay

1999 ◽  
Vol 65 (4) ◽  
pp. 1636-1643 ◽  
Author(s):  
Astrid S. Waage ◽  
Traute Vardund ◽  
Vidar Lund ◽  
Georg Kapperud
Keyword(s):  
Campylobacter Jejuni ◽  
Simple Procedure ◽  
Environmental Water ◽  
Food Samples ◽  
Proteinase K ◽  
Coliform Bacteria ◽  
Intergenic Sequence ◽  
Campylobacter Coli ◽  
Pcr Assay ◽  
Seminested Pcr

ABSTRACT A rapid and sensitive assay was developed for detection of small numbers of Campylobacter jejuni and Campylobacter coli cells in environmental water, sewage, and food samples. Water and sewage samples were filtered, and the filters were enriched overnight in a nonselective medium. The enrichment cultures were prepared for PCR by a rapid and simple procedure consisting of centrifugation, proteinase K treatment, and boiling. A seminested PCR based on specific amplification of the intergenic sequence between the two Campylobacter flagellin genes, flaA andflaB, was performed, and the PCR products were visualized by agarose gel electrophoresis. The assay allowed us to detect 3 to 15 CFU of C. jejuni per 100 ml in water samples containing a background flora consisting of up to 8,700 heterotrophic organisms per ml and 10,000 CFU of coliform bacteria per 100 ml. Dilution of the enriched cultures 1:10 with sterile broth prior to the PCR was sometimes necessary to obtain positive results. The assay was also conducted with food samples analyzed with or without overnight enrichment. As few as ≤3 CFU per g of food could be detected with samples subjected to overnight enrichment, while variable results were obtained for samples analyzed without prior enrichment. This rapid and sensitive nested PCR assay provides a useful tool for specific detection of C. jejuni or C. coli in drinking water, as well as environmental water, sewage, and food samples containing high levels of background organisms.

Preparation and Characterization of Magnetite-Silica Nano-Composite as Adsorbents for Removal of Methylene Blue Dyes from Environmental Water Samples

2014 ◽  
Vol 896 ◽  
pp. 525-531 ◽  
Author(s):  
Adel Fisli ◽  
Saeful Yusuf ◽  
Ridwan ◽  
Yuni K. Krisnandi ◽  
Jarnuzi Gunlazuardi
Keyword(s):  
Methylene Blue ◽  
Water Samples ◽  
Simple Procedure ◽  
Ammonium Hydroxide ◽  
Environmental Water ◽  
Environmental Water Samples ◽  
Blue Dye ◽  
Silica Nanocomposites ◽  
Co Precipitation ◽  
Porosity Analysis

Magnetite-silica nanocomposites (Fe3O4/SiO2) have been synthesized and characterized and were used as an effective sorbent material for dyes removal from environmental water samples. They were prepared by a simple procedure via a co precipitation of iron (II) and iron (III) ion mixture in ammonium hydroxide and then was impregnated by a sodium silicate. The prepared samples were characterized using Zeta potential, XRD, VSM, TEM, EDS, and porosity analysis. The result of characterization showed that Fe3O4 nanoparticles have been coated by silica. The composite have been superparamagnetic behaviour at room temperature and contain both meso-and microporosity system. Mesoporosity contributes dominantly to the pore volume. Adsorption performance of magnetic-silica nanoparticles were examined its ability to adsorp methylene blue dye in aqueous solution. The 20 mg/L of initial concentration of methelene blue, 1 gr/L adsorbent in solution and under shakker for 5 hour, the remain of methylene blue in solution was 13,3% for Fe3O4/SiO2 (3:1), 30,2% for Fe3O4/SiO2 (2:1) and 24,2 % for Fe3O4/SiO2 (1:1). The composite was effective to adsorb dyes in water and can be easily recovered from treated water with helping of magnetic bar.

scholarly journals Source Identification, Ecological Risk and Spatial Analysis of Heavy Metals Contamination in Agricultural Soils of Tanjaro Area, Kurdistan Region, Iraq

2021 ◽  
Vol 5 (2) ◽  
pp. 18-27
Author(s):  
Hayder Issa ◽  
Azad Alshatteri
Keyword(s):  
Heavy Metals ◽  
Ecological Risk ◽  
Risk Index ◽  
Pollution Index ◽  
Potential Ecological Risk ◽  
Soil Samples ◽  
Anthropogenic Sources ◽  
Emission Spectrometry ◽  
Kurdistan Region ◽  
Ecological Risk Index

The current work accomplished a comprehensive evaluation of heavy metals pollution in soil of agricultural areas from Tanjaro sub-district, Sulaimaniyah province, Kurdistan Region, NE Iraq. Ninety soil samples were collected from thirty different locations. Concentrations of 16 heavy metals were measured by inductively coupled plasma optical emission spectrometry ICP-OES. The pollution index (PI), potential ecological risk index (Er), enrichment factor (EF), and ecological risk index (RI) were used to assess the pollution in soil samples. High levels of Li and Ni, and moderate Ba, Cd, Hg, and Pb according to the results of concentration analysis, pollution index (PI), and potential ecological risk (ERI). High levels of Cd and Hg according to the results of Er. Agglomerative hierarchical clustering (AHC) and principal component analysis (PCA) suggested that heavy metals were generated from different natural and anthropogenic sources like natural weathering, fertilizer application, and transportation. Origins of Hg, Cd, Ni, and Pb are probably from activities like overuse of pesticides and fertilizers, whereas Pb could be exhausted from vehicle exhausts as well. Furthermore, spatial distributions revealed nonpoint source pollution for the studied heavy metals. The obtained results help in the remediation techniques of contaminated soils such as dilution with decontaminated soil or extraction or separation of heavy metals.

In situ formation of N- and Fe-doped carbon nanotube/mesoporous carbon nanocomposite with excellent activity for oxygen reduction in acidic media

RSC Advances ◽  
2015 ◽  
Vol 5 (93) ◽  
pp. 76599-76606 ◽  
Author(s):  
Xiang-Jun Huang ◽  
Ya-Nan Luan ◽  
Peng-Fei Yao ◽  
Jin-Song Xie ◽  
Liang Yu ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Oxygen Reduction ◽  
Mesoporous Carbon ◽  
Simple Procedure ◽  
Reduction Reaction ◽  
Acidic Media ◽  
Excellent Activity ◽  
In Situ Formation ◽  
Carbon Nanocomposite

N- and Fe-doped carbon nanotube/CMK3 nanocomposite was firstly prepared by a simple procedure. The typical product shows excellent catalytic ability for oxygen reduction reaction in the acidic media.

Determination of Diazinon and Fenitrothion in Environmental Water and Soil Samples by HPLC

2003 ◽  
Vol 26 (3) ◽  
pp. 483-497 ◽  
Author(s):  
M. E. Sánchez ◽  
R. Méndez ◽  
X. Gómez ◽  
J. Martín‐Villacorta
Keyword(s):  
Environmental Water ◽  
Soil Samples ◽  
Water And Soil Samples
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