Visual colorimetry for determination of trace arsenic in groundwater based on improved molybdenum blue spectrophotometry

2015 ◽  
Vol 7 (6) ◽  
pp. 2794-2799 ◽  
Author(s):  
Takuya Okazaki ◽  
Hideki Kuramitz ◽  
Noriko Hata ◽  
Shigeru Taguchi ◽  
Keita Murai ◽  
...  
Keyword(s):  
Membrane Filtration ◽  
Visual Method ◽  
Molybdenum Blue ◽  
Arsenic In Groundwater ◽  
Filtration Technique

A sensitive on-site visual method for determination of trace arsenic in groundwater based on molybdenum blue colorimetry combined with a membrane filtration technique was developed.

scholarly journals Could the miraculous springs in the Pardubice region be used as drinking water sources?

2012 ◽  
Vol 29 (Special Issue) ◽  
pp. S109-S114
Author(s):  
M. Pejchalová ◽  
P. Hanzalová ◽  
R. Metelka ◽  
J. Vytřasová
Keyword(s):  
Membrane Filtration ◽  
Potable Water ◽  
Coliform Bacteria ◽  
E Coli ◽  
Quantification Method ◽  
Alternative Cultivation ◽  
Microbiological Analyses ◽  
Filtration Technique ◽  
Intestinal Enterococci

Selected springs in the Pardubice Region were repeatedly examined for analytical and microbiological indicators. Microbiological analyses included the determination of intestinal enterococci, coliform bacteria, E. coli, and the number of colonies cultivated at temperature form 22&deg;C to 36&deg;C. The analyses were carried out according to the relevant CSN ISO norms using the membrane filtration technique and also the alternative cultivation method Colilert<sup>&reg;</sup>/Quanti-Tray 2000<sup>&reg;</sup> quantification method using the defined substrate technology. Out of 11 wells and springs examined, only two satisfied the requirements for potable water with all indicators observed.

scholarly journals Flies and water as reservoirs for bacterial enteropathogens in urban and rural areas in and around Lahore, Pakistan

1994 ◽  
Vol 113 (3) ◽  
pp. 435-444 ◽  
Author(s):  
K. Khalil ◽  
G.- B. Lindblom ◽  
K. Mazhar ◽  
B. Kaijser
Keyword(s):  
Rural Areas ◽  
Membrane Filtration ◽  
Diarrhoeal Disease ◽  
Personal Hygiene ◽  
Safe Drinking Water ◽  
Urban And Rural Areas ◽  
The Village ◽  
The City ◽  
Filtration Technique

SUMMARYThe study was conducted to isolate and characterize campylobacter, enterotoxigenicEscherichia coli-labile toxin (ETEC-LT), shigella and salmonella in flies and water.The material for the study, flies (n= 300) and water samples (n= 148), was collected from different localities in and around Lahore, Pakistan. Cultivation of the samples was performed on conventional standard media. Membrane filtration technique was used for water prior to culture. Determination of ETEC-LT was done by GM1 ELISA.Results of our study showed that flies and water were reservoirs for all the four pathogens, campylobacter, ETEC-LT, shigella and salmonella. Flies from the village were carrying fewer enteropathogens, while water from the village was found to be more contaminated as compared to the city. Campylobacter and ETEC-LT were the most frequently isolated pathogens in both flies and water.Thus the incidence of diarrhoeal disease in children of developing countries may be decreased by providing plenty of safe drinking water, improving excreta disposal, toilet facilities and giving education in personal hygiene.

The Influence of Carbohydrate Gelling Agents on Rat Intestinal Transport of Monosaccharides and Neutral Amino Acids in Vitro

1980 ◽  
Vol 59 (5) ◽  
pp. 373-380 ◽  
Author(s):  
B. Elsenhans ◽  
U. Süfke ◽  
R. Blume ◽  
W. F. Caspary
Keyword(s):  
Intestinal Absorption ◽  
Membrane Filtration ◽  
Intestinal Transport ◽  
Michaelis Constant ◽  
Experimental Conditions ◽  
Plant Polysaccharides ◽  
Gelling Agents ◽  
Layer Resistance ◽  
Filtration Technique

1. In the present investigation with rings of everted rat small intestine, carbohydrate gelling agents (plant polysaccharides) such as guaran, pectin, tragacanth, carubin and carrageenan were employed to study their direct effect on intestinal absorption of α-methyl-d-glucoside, d-galactose, l-leucine and l-phenylalanine. 2. Inhibition was found to correlate with the viscosity of the incubation medium, a function only of the polysaccharide concentration, and was independent of other properties of the carbohydrate gelling agents. 3. Reversal of this inhibition was achieved either by washing the tissue free of polysaccharide or by raising tissue agitation. 4. Uptake kinetics in polysaccharide-containing solutions revealed a marked increase of the apparent Michaelis constant although the maximal transport capacity remained essentially unaltered. 5. Since there was no binding of the substrate by the polysaccharides under experimental conditions as judged by a membrane filtration technique, it is concluded that carbohydrate gelling agents may impair intestinal absorption by means of an increased unstirred layer resistance.

Determination of maintenance coefficients ofSaccharomyces cerevisiae cultures with cell recycle by cross-flow membrane filtration

1990 ◽  
Vol 35 (2) ◽  
pp. 201-206 ◽  
Author(s):  
Jean-Louis Uribelarrea ◽  
Jacques Winter ◽  
G�rard Goma ◽  
Alain Pareilleux
Keyword(s):  
Membrane Filtration ◽  
Cross Flow ◽  
Cell Recycle ◽  
Maintenance Coefficients

scholarly journals Sensitive On-site Reflectometric Determination of Phosphorus by Collection of Molybdenum Blue on a Membrane Filter

2017 ◽  
Vol 66 (9) ◽  
pp. 687-692
Author(s):  
Yuya HASEGAWA ◽  
Yasutada SUZUKI ◽  
Susumu KAWAKUBO
Keyword(s):  
Membrane Filter ◽  
Molybdenum Blue
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