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Flow-based green ceramics microdevice with smartphone image colorimetric detection for free chlorine determination in drinking water.
Spectrochim Acta A Mol Biomol Spectrosc
February 2023
Department of Chemistry, Federal University of Viçosa, 36570-900 Viçosa, MG, Brazil. Electronic address:
The residual free chlorine concentration is an important parameter to evaluate the potability of water and the efficiency of disinfection in the water treatment system. As a restricted range of residual free chlorine concentration at all points of the distribution network is needed to ensure efficiency and to avoid deleterious effects, fast and in situ quantification of this specie is important. This work deals with the development and validation of two procedures based on DPD (N,N-diethyl-p-phenylenediamine) and OT (ortho-tolidine, 3,3-dimethylbenzidine) for the determination of residual free chlorine in water by exploiting a flow-based microdevice built with Low Temperature Co-Fired Ceramic (LTCC) technology.
View Article and Find Full Text PDFElectrolytic hydrogen-generating bottle supplies drinking water with free/combined chlorine and ozone repressed within safety standard under hydrogen-rich conditions.
Med Gas Res
October 2021
General Incorporated Association the Institute for Hydrogen Medicine, Kobe; Faculty of Life and Environmental Sciences, Prefectural University of Hiroshima, Shobara, Japan.
Hydrogen molecules have attracted attention as a new antioxidant, but are left to be confirmedly verified whether the oral administration is highly safe or not, concurrently with retention of abundant hydrogen. When electrolysis was performed for 10 minutes using a direct-current electrolytic hydrogen-water generating bottle with tap water, "residual free chlorine" concurrently upon the production of molecular hydrogen (444 μg/L) could be appreciably decreased from 0.18 mg/L to 0.
View Article and Find Full Text PDFSemiquantitative determination of urinary glucose: comparison of home-made strip and routine tests.
J Med Assoc Thai
March 2000
Department of Pathology, Faculty of Medicine, Ramathibodi Hospital, Mahidol University, Bangkok, Thailand.
Glucose oxidase paper strips for semiquantitative determination of glucose in urine are commercially available but details of their preparation are not published. The purpose of this study was to produce such strips, using a coupled enzyme glucose oxidase-peroxidase reaction which would yield purple color with ortho-tolidine, and safranin upon dipping into urine containing glucose. In this present study, without any special equipment, special humidity and temperature control, the new reagent strip named R-strip could be successfully prepared in the atmospheric conditions of Thailand.
View Article and Find Full Text PDFAnalysis of known risk factors for bladder cancer in Pakistani population.
J Pak Med Assoc
February 1995
Sindh Institute of Urology and Transplantation, Dow Medical College, Karachi.
The association of aetiological agents incriminated for bladder cancer are well recognised. They are divided into two groups, occupational and non-occupational. The commonest occupational agents are 2-naphthylamine, benzidine, aminobiphenyl, dichlorobenzidine, orthodianisidine and orthotolidine.
View Article and Find Full Text PDFA study of the sensitivity and specificity of four presumptive tests for blood.
J Forensic Sci
September 1991
Criminal Justice and Forensic Science Department, University of Southern Mississippi, Long Beach.
The purpose of this work was to conduct a comparative study of the sensitivity and specificity of phenolphthalein, tetramethylbenzidine, leucomalachite green, and orthotolidine as presumptive tests for blood. The findings of this study indicate that the phenolphthalein and the leucomalachite green tests are the most specific and that the tetramethylbenzidine and orthotolidine tests are the most sensitive of the group. The author concludes that the phenolphthalein test is the best single test for evaluating suspected bloodstains.
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