scholarly journals Determination of carbofuran in a river water sample using LC-MS/MS

2017 ◽  
Vol 60 ◽  
pp. 012024
Author(s):  
R Yusiasih ◽  
W C Nugraha ◽  
A Hudayya
Keyword(s):  
Water Sample ◽  
River Water ◽  
River Water Sample

scholarly journals Mesoporous Silica-gold Films for Straightforward, Highly Reproducible Monitoring of Mercury Traces in Water

Nanomaterials ◽  
2018 ◽  
Vol 9 (1) ◽  
pp. 35 ◽  
Author(s):  
Anna Mutschler ◽  
Vivian Stock ◽  
Lena Ebert ◽  
Emma Björk ◽  
Kerstin Leopold ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Mesoporous Silica ◽  
Water Sample ◽  
River Water ◽  
Silicon Wafer ◽  
Mercury Concentration ◽  
Atomic Fluorescence Spectrometry ◽  
Silica Layer ◽  
Experimental Conditions

Trace-level detection of mercury in waters is connected with several complications including complex multistep analysis routines, applying additional, harmful reagents increasing the risk of contamination, and the need for expensive analysis equipment. Here, we present a straightforward reagent-free approach for mercury trace determination using a novel thin film sampling stick for passive sampling based on gold nanoparticles. The nanoparticles supported on a silicon wafer and further covered with a thin layer of mesoporous silica. The mesoporous silica layer is acting as a protection layer preventing gold desorption upon exposure to water. The gold nanoparticles are created by thermal treatment of a homogenous gold layer on silicon wafer prepared by vacuum evaporation. This gold-covered substrate is subsequently covered by a layer of mesoporous silica through dip-coating. Dissolved mercury ions are extracted from a water sample, e.g., river water, by incorporation into the gold matrix in a diffusion-controlled manner. Thus, the amount of mercury accumulated during sampling depends on the mercury concentration of the water sample, the accumulation time, as well as the size of the substrate. Therefore, the experimental conditions can be chosen to fit any given mercury concentration level without loss of sensitivity. Determination of the mercury amount collected on the stick is performed after thermal desorption of mercury in the gas phase using atomic fluorescence spectrometry. Furthermore, the substrates can be re-used several tens of times without any loss of performance, and the batch-to-batch variations are minimal. Therefore, the nanogold-mesoporous silica sampling substrates allow for highly sensitive, simple, and reagent-free determination of mercury trace concentrations in waters, which should also be applicable for on-site analysis. Successful validation of the method was shown by measurement of mercury concentration in the certified reference material ORMS-5, a river water.

scholarly journals Characterization of a rare species of Neurospora isolated from a river water sample in China

2015 ◽  
Vol 67 (2) ◽  
pp. 685-693 ◽  
Author(s):  
Xia Yang ◽  
Siliang Huang ◽  
Yubian Zhang ◽  
Xiaoqiang Zhang
Keyword(s):  
Water Sample ◽  
River Water ◽  
Growth Rates ◽  
Rare Species ◽  
Vegetative Growth ◽  
Carbon Sources ◽  
Morphological Characteristics ◽  
Nitrogen Sources ◽  
Fungal Species ◽  
River Water Sample

A fungal isolate (ZZS4408) was obtained from a river water sample in Henan, China, and identified as a member of Neurospora brevispora, a rare species of Neurospora based on its morphological characteristics and ribosomal DNA internal transcribed spacer (rDNA-ITS) sequence. The temperatures suitable for growth of the isolate were 28-37?C with 31?C as the optimum. The growth rates of hyphal tips were 19.1-42.5 (av. 31.9) ?m min-1 at 32?C. The pH suitable for vegetative growth ranged from 5 to 7, with pH 5.5 as the optimum. The heterodisaccharides (sucrose and lactose) and D-alanine were found to be most favorable for vegetative growth of the isolate, as carbon and nitrogen sources, respectively. The vegetative growth of the isolate was more significantly influenced by nitrogen sources compared to carbon sources. N. brevispora could be considered a desirable fungal species for morphodifferentiation studies due to its rapid growth rates under favorable conditions.

Effect-directed analysis (EDA) of Danube River water sample receiving untreated municipal wastewater from Novi Sad, Serbia

2018 ◽  
Vol 624 ◽  
pp. 1072-1081 ◽  
Author(s):  
Muhammad Arslan Kamal Hashmi ◽  
Beate I. Escher ◽  
Martin Krauss ◽  
Ivana Teodorovic ◽  
Werner Brack
Keyword(s):  
Water Sample ◽  
River Water ◽  
Municipal Wastewater ◽  
Danube River ◽  
River Water Sample ◽  
Novi Sad ◽  
Effect Directed Analysis

DETERMINATION OF TRACE ELEMENTS IN RIVER WATER SAMPLE BY PIXE

2000 ◽  
Vol 10 (01n02) ◽  
pp. 57-62 ◽  
Author(s):  
M. Tsuji ◽  
K. Kawasaki ◽  
T. Niizeki ◽  
M. Saitou ◽  
T. Hattori
Keyword(s):  
Water Sample ◽  
River Water ◽  
Detection Efficiency ◽  
River Water Sample ◽  
X Ray ◽  
Concentration Method ◽  
Certified Value ◽  
Tokyo Institute ◽  
Institute Of Technology ◽  
Good Agreement

Transition metal elements and others in river water sample supplied by The Japan Society for Analytical Chemistry (JSAC) were determined by PIXE using 2.5 MeV proton beam at the Tokyo Institute of Technology Van de Graaff Laboratory. The relative detection efficiency for each X-ray of element and its recovery were studied in two methods: "Drop and Dry" and "Concentration" methods. Ten elements ( V , Cr , Mn , Fe , Ni , Cu , Zn , As , Se and Pb ) were determined, being in good agreement with the values certified by JSAC except for Mn . Intensity of K α X-ray of As and L α, X-ray of Pb nearly close to each other could be successfully evaluated using isolated L β X-ray of Pb . Mn was insufficiently recovered to give lower content than the certified value in the present conditions. V that is not listed in the certificate was found to show good agreement with that reported previously. Concentration method using sodium dibenzyldithiocarbamate only could be successfully employed for collecting these elements.

scholarly journals Remediation of Kalyani River water using plant-bacterial cell synergism

2021 ◽  
Author(s):  
Sultan Abdulkadir ◽  
Monika Chhimwal ◽  
Rajeev Kumar Srivastava
Keyword(s):  
Water Sample ◽  
River Water ◽  
Bacterial Cell ◽  
Pollutant Removal ◽  
Bacterial Cells ◽  
High Concentration ◽  
River Water Sample ◽  
Polluted River ◽  
Epipremnum Aureum ◽  
Enhanced Remediation

Abstract The purpose of this research was to evaluate the potential of plant-immobilized bacterial cells synergism for enhanced remediation of polluted river water. The polluted river water sample was collected from Kalyani river, Uttarakhand, India and characterized by high concentration of COD (1010 mg/l), BOD (230 mg/l), NO3−-N (30 mg/l), PO43−-P (48.9 mg/l), and Pb(1.028 mg/l). This water sample was treated on a lab scale with immobilized bacterial cells and Epipremnum aureum in various treatment setups. The treatment system 3 using a combination of immobilized bacterial cells and Epipremnum aureum had the highest pollutant removal efficiency of all the treatment setups tested. At 96 hours, the total COD, BOD, NO3−-N, PO43−-P and Pb contents of polluted river water sample were reduced to 60 mg/l, 20 mg/l, 2.4 mg/l, 11.7 mg/l, and 0.065 mg/l, respectively. Based on the findings, it is possible to conclude that utilizing plant-immobilized bacterial cell synergism is an environmentally friendly and cost-effective approach for enhanced remediation and rejuvenation of polluted river water. Furthermore, a field-scale application of plant-immobilized bacterial cell synergism via floating wetland construction for on-site treatment of contaminated water on the Kalyani river is recommended.

Influence of methylheptenone and related phytoplankton norcarotenoids on heterotrophic aquatic bacteria

1981 ◽  
Vol 27 (1) ◽  
pp. 144-147 ◽  
Author(s):  
W. Reichardt
Keyword(s):  
Water Sample ◽  
Glucose Uptake ◽  
River Water ◽  
Heterotrophic Bacteria ◽  
Aquatic Bacteria ◽  
River Water Sample ◽  
Bacterial Cultures ◽  
Metabolic Functions ◽  
Noncompetitive Inhibitor ◽  
Cyanobacteria And Algae

Certain norcarotenoids, which have recently been found as excretion products of freshwater cyanobacteria and algae, are potent inhibitors of different metabolic functions in heterotrophic bacteria. 6-Methylhept-5-en-2-one showed the strongest effects and acted as a noncompetitive inhibitor of both glucose uptake and respiration by aquatic isolates of Chromobacterium lividum and Arthrobacter sp. Inhibition of the heterotrophic potential of glucose uptake by 6-methylhept-5-en-2-one was characterized by considerably lower inhibitor constants for bacterial cultures (Ki = 0.4 and 1.6 μM) than for a river water sample (Ki = 186.0 μM).

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