The suitability of 5,10,15,20-tetrakis(4-carboxyphenyl)porphine as a complexing agent for the on-line preconcentration of cadmium using an anion exchanger (Amberlite IRA-904) in a microcolumn has been tested. Various parameters which affect complex formation and its sorption, as well as elution into the nebulizer of flame atomic absorption spectrometry (FAAS), were optimized. A 5 x 10(-4) mol 1(-1) reagent was on-line mixed with an aqueous sample solution and flowed through the microcolumn for 2 min. The sorbed complexes were then eluted with 2 mol 1(-1) of nitric acid into the nebulizer of FAAS. A good precision (2.1% RSD for 40 microg 1(-1) cadmium) and a high enrichment factor (36) with a detection limit (3sigma) of 1.4 microg 1(-1) were obtained. The achieved analytical results for a standard reference material (SRM 1643d) were in good agreement with the certified values.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.2116/analsci.18.571 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Human umbilical cord mesenchymal stem cells improve the ovarian function through oxidative stress-mediated PERK/eIF-2α/ATF4/CHOP signaling in premature ovarian insufficiency mice.
Mol Biol Rep
December 2024
The Affiliated Loudi Hospital, Hengyang Medical School, University of South China, Loudi, Hunan, 417000, China.
Background: Premature ovarian insufficiency (POI) is a refractory disease that severely affects female fertility. The PERK/eIF-2α/ATF4/CHOP pathway is one of the classical pathways involved in the unfolded protein response to endoplasmic reticulum stress by regulating protein synthesis and promoting apoptosis. This study aimed to investigate the functional role and mechanism of human umbilical cord mesenchymal stem cells (hUCMSCs) in the POI animal model through the PERK/eIF-2α/ATF4/CHOP pathway.
View Article and Find Full Text PDFVersatile Waste Wood-Chitosan Composites for 2,4-D and Paraquat Adsorption: Isotherm Modelling and Thermodynamic Evaluation.
Chemosphere
December 2024
Inorganic Materials Research Laboratory, Department of Chemistry, Trent University, 1600 West Bank Dr., Peterborough, ON, Canada K9J 7B8. Electronic address:
2,4-dichlorophenoxy acetic acid (2,4-D) and 1,1-dimethyl-4,4-bipiridinium chloride (paraquat) are among the most widely used herbicides and are known to be toxic. Fabrication of green adsorbents which are capable of removing both herbicides remains a challenge. Here, we fabricate a novel adsorbent from tropical waste wood and use a facile, chitosan-mediated N-heteroatom functionalization technique to augment surface nitrogen and improve specific surface area.
View Article and Find Full Text PDFA novel engineered strain of Methylorubrum extorquens for methylotrophic production of glycolic acid.
Microb Cell Fact
December 2024
Fraunhofer Institute for Interfacial Engineering and Biotechnology, Straubing Branch BioCat, Schulgasse 11a, Straubing, Germany.
The conversion of CO into methanol depicts one of the most promising emerging renewable routes for the chemical and biotech industry. Under this regard, native methylotrophs have a large potential for converting methanol into value-added products but require targeted engineering approaches to enhance their performances and to widen their product spectrum. Here we use a systems-based approach to analyze and engineer M.
View Article and Find Full Text PDFSynthesis and crystal structure of 1,3,5-tris-[(1-benzotriazol-1-yl)meth-yl]-2,4,6-tri-ethyl-benzene.
Acta Crystallogr E Crystallogr Commun
October 2024
Institut für Organische Chemie Technische Universität Bergakademie, Freiberg, Leipziger Str 29 09599 Freiberg/Sachsen Germany.
In the crystal structure of the title compound, CHN, the tripodal mol-ecule exists in a conformation in which the substituents attached to the central arene ring are arranged in an alternating order above and below the ring plane. The three benzotriazolyl moieties are inclined at angles of 88.3 (1), 85.
View Article and Find Full Text PDFUnraveling the potential structure of a Parnassius butterfly in Japan: Insights into the expansion history.
Mol Phylogenet Evol
December 2024
Laboratory of Insect Ecology, Faculty of Applied Biological Sciences, Gifu University, Yanagido 1-1, Gifu City, Gifu 501-1193, Japan.
The Japanese Archipelago consists of a series of isolated yet interconnected islands off the Eurasian continent. The linear topography of the archipelago presents a unique biogeographic context for the dispersal of organisms from the continent. In this study, mitochondrial DNA (mtDNA) and single-nucleotide polymorphism (SNP) variation were employed to elucidate the dispersal history of the Japanese clouded butterfly (Parnassius glacialis) across the Japanese Archipelago, including the northern island (Hokkaido), the main island (Honshu), and Shikoku Island.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!