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Development of a bioreactor with an integrated non-dispersive infrared CO sensor for rapid and sensitive detection of Cr(VI) toxicity in water.
J Hazard Mater
January 2025
Institute of Chemical Technology, Vietnam Academy of Science and Technology, 1A TL29 Street, Thanh Loc Ward, District 12, HCM City, Viet Nam; Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Street, Cau Giay District, Hanoi, Viet Nam. Electronic address:
Whole-cell bioreactors equipped with external physico-chemical sensors have gained attention for real-time toxicity monitoring. However, deploying these systems in practice is challenging due to potential interference from unknown wastewater constituents with liquid-contacted sensors. In this study, a novel approach using a bioreactor integrated with a non-dispersive infrared CO₂ sensor for both toxicity detection and real-time monitoring of microbial growth phases was successfully demonstrated.
View Article and Find Full Text PDFSimple and Rapid HPLC-ICP-MS Method for the Simultaneous Determination of Cr(III) and Cr(VI) by Combining a 2,6-Pyridinedicarboxylic Acid Pre-Complexation Treatment.
Mass Spectrom (Tokyo)
December 2024
Department of Applied Chemistry for Environment, School of Science and Technology, Kwansei Gakuin University, Gakuen-Uegahara-1, Sanda, Hyogo 669-1330, Japan.
A simple and rapid analytical method was developed for the simultaneous determination of two chromium species, Cr(III) and Cr(VI), in the environmental waters by high-performance liquid chromatography-inductively coupled plasma-mass spectrometry (HPLC-ICP-MS). This study incorporated a chelating pretreatment with 2,6-pyridinedicarboxylic acid (PDCA) to convert Cr(III) species into a stable Cr(III)-PDCA anion complex, which was then separated from Cr(VI) oxyanion using an anion exchange column. Building on the fundamental analytical approach proposed by Shigeta .
View Article and Find Full Text PDFMethod validation and geochemical modelling of chromium speciation in natural waters.
Sci Rep
December 2024
Faculty of Mining and Geology, University of Belgrade, Đušina 7, Beograd, Serbia.
Article Synopsis
- The study validates various analytical methods, including ICP-OES, ICP-MS, and IC-ICP-MS, for accurately measuring ultra-trace levels of chromium and its specific form, Cr(VI), in groundwater.
- Results show detection limits for chromium in these techniques range from 0.053 to 1.3 µg/L, with measurement uncertainty between 14% and 19%, and Cr(VI) can be quantitatively measured down to 0.12 µg/L with an uncertainty of 10% to 14%.
- Statistical analysis revealed no significant differences in chromium measurements between the methods, and it confirmed that total chromium concentration in the tested waters primarily reflects Cr(VI), identifying its
A Method to Distinguish Chromium-Tanned Leathers With Low and High Risks of Surface Hexavalent Chromium.
Contact Dermatitis
December 2024
Department of Chemistry, The University of Western Ontario, London, Ontario, Canada.
Introduction: Traces of hexavalent chromium, Cr(VI), are a major concern for skin contact with Cr-tanned leather. Current extraction methods (ISO 17075-1:2017) for Cr(VI) testing do not necessarily reflect the true potential of surface-formed Cr(VI), as extracted concentrations are dependent on previous storage and atmospheric conditions.
Objectives: To test whether a spiking method protocol can distinguish leathers with high and low risks of releasing Cr(VI).
Unveiling the impact of exposed mineral facets on chromium repartitioning in aging lepidocrocite.
Sci Total Environ
December 2024
School of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, South China University of Technology, Guangzhou 510006, PR China.
Article Synopsis
- Lepidocrocite, an iron oxide, is important for how heavy metals interact and change in soil and sediment, but how it behaves over time, especially with chromium (Cr(VI)), isn't fully understood.
- * The study shows that the transformation of lepidocrocite into other forms like goethite and hematite depends on its shape and exposed facets, with rod-like lepidocrocite being more stable compared to plate-like lepidocrocite.
- * Cr(VI) binding boosts lepidocrocite's stability, particularly on certain facets, and affects its release rates; for instance, Cr(VI) was released more from plate-like lepidocrocite than from rod-like lepidoc
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