Development of a high-throughput method based on thin-film microextraction using a 96-well plate system with a cork coating for the extraction of emerging contaminants in river water samples

2017 ◽  
Vol 41 (3) ◽  
pp. 697-703 ◽  
Author(s):  
Lucas Morés ◽  
Adriana Neves Dias ◽  
Eduardo Carasek
Keyword(s):  
Thin Film ◽  
River Water ◽  
High Throughput ◽  
Water Samples ◽  
Emerging Contaminants ◽  
River Water Samples ◽  
High Throughput Method ◽  
Plate System

A simple and rapid electrochemical sensing method for metribuzin determination in tap and river water samples

2016 ◽  
Vol 8 (12) ◽  
pp. 2698-2705 ◽  
Author(s):  
Zorica Stojanović ◽  
Ana Đurović ◽  
Snežana Kravić ◽  
Nada Grahovac ◽  
Zvonimir Suturović ◽  
...  
Keyword(s):  
Thin Film ◽  
River Water ◽  
Water Samples ◽  
Mercury Electrode ◽  
Electrochemical Sensing ◽  
River Water Samples ◽  
Electroanalytical Method

This paper describes an electroanalytical method for the determination of metribuzin using a thin film mercury electrode by chronopotentiometry.

scholarly journals Simple enumeration of Escherichia coli concentrations in river water samples by measuring β-D-glucuronidase activities in a microplate reader

2021 ◽  
Author(s):  
Hisashi Satoh ◽  
Yutaka Katayose ◽  
Reiko Hirano
Keyword(s):  
Escherichia Coli ◽  
River Water ◽  
High Throughput ◽  
Correlation Equation ◽  
E Coli ◽  
River Water Samples ◽  
Synthetic Substrate ◽  
High Throughput Method ◽  
Microplate Reader ◽  
Highly Correlated

Abstract Monitoring of Escherichia coli concentrations in river water (RW) is essential to identify fecal pollution of the river. The objective of this study was to assess the suitability of a novel simple and high throughput method developed in our laboratory to enumerate E. coli concentrations in RW samples. The method is based on the use of the synthetic substrate specific for the β-D-glucuronidase (GUS) produced by E. coli. GUS activities and E. coli concentrations were monitored at eight selected sites in rivers running through Sapporo, Japan. Because the fluorescence intensities of the synthetic substrate in the RW samples increased linearly over a 4-h incubation period, we could estimate the GUS activities of the RW samples. The GUS activities were highly correlated with E. coli concentrations at >100 most probable numbers 100 mL−1 with a correlation coefficient of 0.87. The GUS activities of the RW samples collected from all sampling sites fitted well to a single correlation equation, which indicates that it was applicable to the estimation of E. coli concentrations regardless of the sampling sites. This method is simple, rapid, reliable, inexpensive, and high throughput, and is therefore useful for monitoring E. coli in RW.

scholarly journals Development and Validation of Chronopotentiometric Method for Imidacloprid Determination in Pesticide Formulations and River Water Samples

2016 ◽  
Vol 2016 ◽  
pp. 1-11 ◽  
Author(s):  
Ana Đurović ◽  
Zorica Stojanović ◽  
Snežana Kravić ◽  
Nada Grahovac ◽  
Vojislava Bursić ◽  
...  
Keyword(s):  
Thin Film ◽  
River Water ◽  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Water Samples ◽  
Mercury Electrode ◽  
Carbon Electrode ◽  
River Water Samples ◽  
Pesticide Formulations ◽  
Experimental Parameters

A new electrochemical method for determination of imidacloprid using chronopotentiometry on thin film mercury and glassy carbon electrode was presented. The most important experimental parameters of chronopotentiometry were examined and optimized with respect to imidacloprid analytical signal. Imidacloprid provided well-defined reduction peak in Britton-Robinson buffer on thin film mercury electrode at −1.0 V (versus Ag/AgCl (KCl, 3.5 mol/L)) and on glassy carbon electrode at −1.2 V (versus Ag/AgCl (KCl, 3.5 mol/L)). The reduction time was linearly proportional to concentrations from 0.8 to 30.0 mg/L on thin film mercury electrode and from 7.0 to 70.0 mg/L on glassy carbon electrode. The detection limits were 0.17 mg/L and 0.93 mg/L for thin film mercury and glassy carbon electrode, respectively. The estimation of method precision as a function of repeatability and reproducibility showed relative standard deviations values lower than 3.73%. Recovery values from 97.3 to 98.1% confirmed the accuracy of the proposed method, while the constancy of the transition time with deliberated small changes in the experimental parameters indicated a very good robustness. A minor influence of possible interfering compounds proved good selectivity of the method. Developed method was applied for imidacloprid determination in commercial pesticide formulations and river water samples.

Fabrication of dendritic nanoporous gold via a two-step amperometric approach: Application for electrochemical detection of methyl parathion in river water samples

Talanta ◽  
2021 ◽  
Vol 226 ◽  
pp. 122130
Author(s):  
Gilberto J. Silva Junior ◽  
Jéssica Soares Guimarães Selva ◽  
Anandhakumar Sukeri ◽  
Josué M. Gonçalves ◽  
Matias Regiart ◽  
...  
Keyword(s):  
River Water ◽  
Electrochemical Detection ◽  
Water Samples ◽  
Methyl Parathion ◽  
Nanoporous Gold ◽  
River Water Samples

Modified paramagnetic beads in a microfluidic system for the determination of ethinylestradiol (EE2) in river water samples

2010 ◽  
Vol 25 (6) ◽  
pp. 1376-1381 ◽  
Author(s):  
Noelia A. Martínez ◽  
Rudolf J. Schneider ◽  
Germán A. Messina ◽  
Julio Raba
Keyword(s):  
River Water ◽  
Water Samples ◽  
Microfluidic System ◽  
River Water Samples ◽  
Paramagnetic Beads

Spectrophotometry determination of Congo red in river water samples using nanosilver

2012 ◽  
Vol 94 (10) ◽  
pp. 1886-1892 ◽  
Author(s):  
R. Sahraei ◽  
A. Farmany ◽  
S.S. Mortazavi ◽  
H. Noorizadeh
Keyword(s):  
River Water ◽  
Water Samples ◽  
Congo Red ◽  
River Water Samples
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