scholarly journals Occurrence, Levels and Spatial Distribution of Polybrominated Diphenyl Ethers: Case Study of Elemi River in Ado-Ekiti, Nigeria

2021 ◽  
Vol 22 (2) ◽  
pp. 264-272
Author(s):  
Olayinka Abidemi Ibigbami
Keyword(s):  
Gas Chromatography ◽  
Spatial Distribution ◽  
Water Samples ◽  
Polybrominated Diphenyl Ethers ◽  
Chromatography Analysis ◽  
Gas Chromatography Analysis ◽  
Diphenyl Ethers ◽  
The Mean ◽  
Mean Concentration

Polybrominated diphenyl ethers (PBDEs) were seasonally determined in water and sediments of the Elemi River, Nigeria using gas chromatography analysis. Samples were collected in two consecutive seasons for six months, monitoring the program every month. Three BDEs congeners (28, 47 and 154) were only detected with the mean concentration of ND - 0.001 µg/L and ND - 0.143 µg/kg in water and sediments, respectively. BDEs (99, 100, 153, 183 and 209) were consistently absent in both seasons. The distribution of BDEs showed that BDE 28 was consistently found in the water samples throughout the months of sampling, while the sediments sparingly contained BDE 28 and 47. The study proposed the need for effective measures to reduce the deleterious contribution of these persistent compounds into the rivers.

Diversity of Root Bacteria from Peanut Cropping Systems

2004 ◽  
Vol 31 (2) ◽  
pp. 86-91 ◽  
Author(s):  
D. T. Gooden ◽  
H. D. Skipper ◽  
J. H. Kim ◽  
K. Xiong
Keyword(s):  
Fatty Acids ◽  
Biological Control ◽  
Gas Chromatography ◽  
Cropping Systems ◽  
Cropping System ◽  
Critical Research ◽  
Chromatography Analysis ◽  
Rotation System ◽  
Gas Chromatography Analysis ◽  
Peanut Production

Abstract Rhizobacteria play an important role in sustainable agriculture via plant growth and biological control of pests in a number of ecosystems. Understanding the interactions of crop rotation and rhizobacteria on peanut production is a critical research need. Development of a database on the rhizobacteria obtained from continuous and rotational fields of peanut was initiated in 1997 and terminated in 2000. Peanut was planted in monoculture for 4 yr. In rotational plots, peanut, cotton, corn, and peanut were planted in sequence. Rhizobacteria were isolated from the roots of crop plants grown in a Norfolk soil near Florence, SC. These isolates were identified by composition of fatty acids from gas chromatography analysis (GC/FAME). Arthrobacter and Bacillus were the major genera from non-rhizosphere soils. At initiation of this study in July 1997, the plots selected for continuous peanut had more diversity in rhizobacteria than those plots selected for rotation. In July 2000, rhizobacteria diversity was greater from peanut roots in the rotation cropping system than continuous peanut. Even though rhizobacteria diversity was greater in the rotation system, higher peanut yields were recorded in the continuous peanut system in 2000. Burkholderia spp. were always isolated from the peanut and other crop rhizospheres at each sampling date.

Comprehensive two-dimensional gas chromatography of polybrominated diphenyl ethers

2005 ◽  
Vol 1100 (2) ◽  
pp. 200-207 ◽  
Author(s):  
P. Korytár ◽  
A. Covaci ◽  
P.E.G. Leonards ◽  
J. de Boer ◽  
U.A.Th. Brinkman
Keyword(s):  
Gas Chromatography ◽  
Polybrominated Diphenyl Ethers ◽  
Two Dimensional ◽  
Diphenyl Ethers
Sign in / Sign up

Export Citation Format

Share Document