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A novel pH-sensitive method for the quantification of Ca ions by complexometric titration with NaHEDTA.
Anal Methods
August 2024
Department of Chemistry, Government Commerce & Science College Dahej, Bharuch, Gujarat 392 130, India, (Affiliated with Veer Narmad South Gujarat University, Surat, Gujarat, India).
A simple and accurate complexometric titration has been developed by the reaction between Ca ions (pH 7) and NaHEDTA (pH 11) solutions. Formation of a Ca-EDTA complex and release of H ions in the system were traced by a decrease in the pH. At the equivalence point of the titration, a sharp increase in the pH was observed.
View Article and Find Full Text PDFDeciphering groundwater pollution in the Lower Anayari Catchment: insights from using δH, δO, PMF, and APCS-MLR receptor model.
Environ Sci Pollut Res Int
April 2024
Nuclear Chemistry and Environmental Research Centre, Ghana Atomic Energy Commission (GAEC), National Nuclear Research Institute (NNRI), Box LG 80, Legon-Accra, Ghana.
This research provides a comprehensive analysis of groundwater pollution in the Lower Anayari Catchment (LAC) through δH and δO isotopic analysis, along with positive matrix factorization (PMF) and PCS-MLR receptor models. Forty groundwater samples were collected from hand-dug wells and equipped boreholes across the LAC. Flame photometry for Na and K, complexometric titration for Ca, ion chromatography for Cl, F, NO, SO, and PO, and atomic absorption spectrometry for Mg, Fe, Pb, Cd, As, and Ni were analytical techniques/instruments employed.
View Article and Find Full Text PDF[Separation, characterization, and antiviral activity of colloidal phase state of Maxing Shigan Decoction].
Zhongguo Zhong Yao Za Zhi
August 2023
School of Pharmacy, Nanjing University of Chinese Medicine Nanjing 210023,China.
This study focused on the separation, characterization, content determination, and antiviral efficacy research on colloidal particles with different sizes in Maxing Shigan Decoction(MXSG). The mixed colloidal phase of MXSG was initially separated into small colloidal particle segment(S), medium colloidal particle segment(M), and big colloidal particle segment(B) using ultrafiltration. Further fine separation was performed using size-exclusion chromatography.
View Article and Find Full Text PDFReevaluation for UV photolysis of Fe(III) inducing tetracycline abatement: Overlooked significance of complexation-assistance in environmental fates of antibiotics.
J Hazard Mater
September 2023
MOE Key Laboratory of Deep Earth Science and Engineering, College of Architecture and Environment, Sichuan University, Chengdu 610065, China; Yibin Industrial Technology Research Institute of Sichuan University, Yibin 644000, China. Electronic address:
Interaction of antibiotics with metal ions in aquatic environments, commonly occurring to form complexes, may affect the migration, transformation and reactivity of residual antibiotics. This study demonstrates the photolysis of Fe(III) by UV irradiation at pH 3.5, as an advanced oxidation process, to produce •OH for the abatement of a common broad-spectrum antibiotic compound, tetracycline (TET).
View Article and Find Full Text PDFA new look at an old classic: implementation of a SERS-based water hardness titration.
Analyst
July 2023
Laboratoire Matière et Systèmes Complexes, UMR 7057, Université Paris Cité, CNRS, 10 rue Alice Domon et Léonie Duquet, 75013, Paris, France.
The routine use of SERS as an analytical technique has been hindered by practical considerations among which the irreproducibility of its signals and the lack of robustness of its calibration. In the present work, we examine a strategy to perform quantitative SERS without the need for calibration. The method reinvests a colorimetric volumetric titration procedure to determine water hardness but involves monitoring the progression of the titration through the SERS signal of a complexometric indicator.
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