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.

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

scholarly journals COMPARISON BETWEEN ORGANIC MATTER CONTENT OF MAIN SOIL ORDERS IN KURDISTAN REGION USING TWO DIFFERENT METHODS.

2020 ◽  
Vol 51 (Special) ◽  
Author(s):  
Khoshnaw & Esmail
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Linear Equation ◽  
Organic Matter Content ◽  
Combustion Method ◽  
Matter Content ◽  
Soil Samples ◽  
Kurdistan Region ◽  
Loss On Ignition ◽  
Dry Combustion

This study was conducted to compare between two methods of soil organic matter determination for main soil orders in Kurdistan region/Iraq, for this purpose forty-five soil samples were taken then the organic matter was determined using chemical (Walkley-Black (wet) method and loss-on-ignition method (dry) combustion method. The results indicated the significant correlation (r = 0.88**) between the studied methods It means there is good adjustment to convert organic matter by loss-on-ignition method (dry) to Walkley-Black (wet) method organic matter by this linear equation (organic matter by loss-on-ignition =1.651* Walkley-Black method organic matter +2.1877) this equation can be used to convert organic matter by two methods for Mollisols(M), Vertisols(V) and Aridisols(A) in Hawler(H), Sulaimani(S) and Duhok(D) governorates, this equation is very important and economic to determine and convert dry method to wet method, the amount of organic matter for M, V, A was recorded the highest value (49.5, 24.8, 20 gkg-1) respectively for Mollisols, Vertisols, and Aridisols at Hawler (H), Sulaimani (S), and Duhok(D) respectively for (DM5, SV4, DA1) in Duhok Mollisols, Sulaimani Vertisols and Duhok Aridisol respectively for walk- black (wet) method, the highest value for dry method organic matter in Mollisols, Vertisols, Aridisols was recorded (97.6, 77.9, 50.3 g kg-1) for soil orders (MD3, VD4, AD4) respectively.

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