Contamination of pond and canal water by residues of organophosphorus and carbamate pesticides in Feni district, Bangladesh

2021 ◽  
Author(s):  
Mohammad Amir Hossain Bhuiyan ◽  
M. Hasibur Rahman ◽  
M. Amin Uddin ◽  
M. A. Z. Chowdhury ◽  
M. A. Rahman ◽  
...  
Keyword(s):  
Canal Water ◽  
Carbamate Pesticides

Pilot-plant experiments for improvement of polluted canal/klong water by rock-bed filtration

1997 ◽  
Vol 35 (8) ◽  
pp. 83-90
Author(s):  
Shigeo Fujii ◽  
Chiaki Niwa ◽  
Mitsuo Mouri ◽  
Ranjna Jindal
Keyword(s):  
Organic Matter ◽  
Pilot Plant ◽  
Horizontal Flow ◽  
Removal Mechanism ◽  
Soluble Organic Matter ◽  
Filter Media ◽  
Canal Water ◽  
Rock Bed ◽  
One Year ◽  
Filtration Technique

Applicability of the rock-bed filtration technique was investigated through pilot-plant experiments in Bangkok, Thailand. Polluted canal water was used as horizontal flow influent to two reactor channels filled with rocks. During one year operation, HRT, filter media, and aeration mode, were changed in several runs. The results showed that 1) the rock-bed filtration with aeration and the HRT more than 6 h can successfully improve polluted klong water by reducing the pollutants (e.g. 60-120mg/L of SS to 20-40 mg/L and 15-30 mg/L of BOD to 5-20 mg/L); 2) main removal mechanism seems to be the sedimentation resulting from the settleability enhanced by aeration, and the biofilm attached onto rocks also works in the reduction of soluble organic matter; 3) a combination of three rock sizes arranged in descending order showed best results; 4) longer HRT (13 h) produces better effluent but is not so effective if it exceeds 9 hours; 5) 60-70% of sediment IL was decomposed in a year, and porosity in rock beds reduced approximately 16%.

Examination of Conditions for the Determination of Carbamate Pesticides in Soils

1992 ◽  
Vol 57 (8) ◽  
pp. 1632-1638 ◽  
Author(s):  
Věra Tatarkovičová ◽  
Zdeněk Stránský
Keyword(s):  
Activated Carbon ◽  
Solvent Extraction ◽  
Soil Type ◽  
Extraction Procedure ◽  
Purification Procedure ◽  
Factors Affecting ◽  
Carbamate Pesticides ◽  
Rp Hplc ◽  
Extracting Solvent

The procedure for the determination of carbamate pesticides in soil was optimized. The following factors affecting the final results were investigated: extracting solvent, extraction procedure, extract purification procedure, and soil type. Triple extraction with acetone and purification of the extract on a two-stage purification column containing an activated carbon-silica gel 1+1 mixture were found optimal. The extracts after treatment were analyzed by RP-HPLC with UV detection. The method developed allows carbamate pesticides in soil to be determined at concentrations in excess of 30 μg kg-1.

Residues and Persistence of Glyphosate in Irrigation Water

Weed Science ◽  
1976 ◽  
Vol 24 (1) ◽  
pp. 47-50 ◽  
Author(s):  
R. D. Comes ◽  
V. F. Bruns ◽  
A. D. Kelley
Keyword(s):  
Irrigation Water ◽  
Soil Samples ◽  
Single Site ◽  
Application Site ◽  
Canal Water ◽  
Aminomethylphosphonic Acid ◽  
Dry Soil

Neither glyphosate [N-(phosphonomethyl)glycine] nor the soil metabolite aminomethylphosphonic acid were detected in the first flow of water through two canals following application of glyphosate at 5.6 kg/ha to ditchbanks when the canals were dry. Soil samples collected the day before canals were filled (about 23 weeks after treatment) contained about 0.35 ppm glyphosate and 0.78 ppm aminomethylphosphonic acid in the 0 to 10-cm layer. When glyphosate was metered into the water at a rate calculated to provide 150 ppb in the canal water at a single site on two flowing canals, about 70% of the glyphosate was accounted for 1.6 km downstream from the application site. Thereafter, the rate of disappearance diminished, and about 58% of the applied glyphosate was present at the end of the canals 8 or 14.4 km downstream from the introduction sites.

scholarly journals Research on Degradation Characteristics of Nonylphenol in Water by Highly Effective Complex Microorganisms

2018 ◽  
Vol 53 ◽  
pp. 04016
Author(s):  
Juan Ma ◽  
Fang-yan Chen ◽  
Yu-bin Tang ◽  
Xin-gang Wang
Keyword(s):  
Pseudomonas Putida ◽  
Yangtze River ◽  
Degradation Rate ◽  
Volume Ratio ◽  
Morphological Observation ◽  
Bacterial Suspension ◽  
Canal Water ◽  
Form Complex ◽  
Single Strain ◽  
Degrading Bacteria

Aiming at effectively controlling nonylphenol (NP) pollution, three bacterial strains were isolated from activated sludge and landfill leachate, which could grow with nonylphenol as sole carbon and energy source. The three nonylphenol-degrading bacteria isolated were named as WN6, SLY9 and SLY10, respectively. The morphological observation and 16S rDNA identification revealed that the strains belonged to Serratia sp., Klebsiella sp. and Pseudomonas putida, respectively. WN6 and SLY9 contained ALK gene, while WN6 and SLY10 harbored C12O genes. The three strains were combined together to form complex microorganisms ZJF. The ratio of Serratia sp. to Klebsiella sp. to Pseudomonas putida was 2:1:2 (volume ratio of bacterial suspension). Under the conditions that temperature was 30 ℃, pH was 6, inoculation amount was 10% (volume ratio), initial concentration of NP solutions was 20 mg/L, NP degradation rate by ZJF reached 73.82%, compared with any single strain of the three bacteria, NP degradation rate by ZJF increased more than 15% during 6 days. Bioremediation of nonylphenol-polluted the Yangtze River and the Ancient Canal water by ZJF ware simulated. After a 6-day incubation period, the degrading rate of nonylphenol in Ancient Canal water was close to 80%, and the degrading rate of nonylphenol in Yangtze River water was 72.84%.

scholarly journals Salinization/sodification of soil and physiological dynamics of sunflower irrigated with saline–sodic water amending by potassium and farm yard manure

2016 ◽  
Vol 7 (4) ◽  
pp. 476-487 ◽  
Author(s):  
M. Ashraf ◽  
S. Muhammad Shahzad ◽  
N. Akhtar ◽  
M. Imtiaz ◽  
A. Ali
Keyword(s):  
Photosynthetic Rate ◽  
Stability Index ◽  
Soil Salinization ◽  
Sodium Adsorption Ratio ◽  
Membrane Stability Index ◽  
Farm Yard Manure ◽  
Canal Water ◽  
Subsequent Increase ◽  
Sodic Water ◽  
Relative Water

Sunflower (Helianthus annuus L.) plants were grown with saline–sodic water (SSW) by treating with potassium (K @ 100 and 200 mg K2O kg−1 soil) and farm yard manure (FYM @ 5 and 10% of soil, w/w). Irrigation with untreated SSW caused soil salinization/sodification, leading to an increase in electrical conductivity (EC) of 165% and sodium adsorption ratio (SAR) 100% with the subsequent increase of 736% in shoot Na+, a decrease of 52% in shoot K+ and 94% in shoot K+:Na+ratio compared to canal water. SSW also decreased physiological activities: 31% relative water content (RWC), 34% membrane stability index (MSI), 51% protein, 33% chlorophyll and 58% photosynthetic rate compared to canal water. Integrated application of K and FYM, at higher level, decreased soil EC by 54% and SAR 43%, and shoot Na+ 57% with a corresponding improvement in soil organic matter 166%, shoot K+ 360%, shoot K+:Na+ratio 987%, RWC 34%, MSI 37%, protein 60%, photosynthetic rate 102%, superoxide dismutase 92%, peroxidase 78% and catalase 52% compared to SSW without K and/or FYM. In conclusion, exogenous application of K and FYM could be a promising approach to use brackish water in agriculture on a sustainable basis.

Ionic liquid magnetic bar microextraction and HPLC determination of carbamate pesticides in real water samples

2012 ◽  
Vol 179 (3-4) ◽  
pp. 193-199 ◽  
Author(s):  
Sha Peng ◽  
Jing Xiao ◽  
Jing Cheng ◽  
Miao Zhang ◽  
Xiaoyan Li ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Water Samples ◽  
Hplc Determination ◽  
Carbamate Pesticides ◽  
Real Water Samples

Cholinesterase-based dipstick assay for the detection of organophosphate and carbamate pesticides

2007 ◽  
Vol 594 (1) ◽  
pp. 37-43 ◽  
Author(s):  
Hwa-Young No ◽  
Young Ah Kim ◽  
Yong Tae Lee ◽  
Hye-Sung Lee
Keyword(s):  
Carbamate Pesticides
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