TITLE

New analytical procedure based on a cellulose bag and ionic exchanger with p-aminobenzoic acid groups for differentiation of labile and inert metal species in aquatic systems

AUTHOR(S)
Rosa, André Henrique; Goveia, Danielle; Bellin, Iramaia C.; Da Silva Lessa, Suzan; Dias Filho, Newton L.; de Magalhães Padilha, Pedro
PUB. DATE
December 2006
SOURCE
Analytical & Bioanalytical Chemistry;Dec2006, Vol. 386 Issue 7/8, p2153
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A new procedure was developed for the in situ characterization of the lability of metal species in aquatic systems by using a system equipped with a diffusion membrane and cellulose organomodified with p-aminobenzoic acid groups (DM-Cell-PAB). To this end, the DM-Cell-PAB system was prepared by adding cellulose organomodified with p-aminobenzoic acid groups (Cell-PAB) to pre-purified cellulose bags. After the DM-Cell-PAB system was sealed, it was examined in the laboratory to evaluate the influence of complexation time, mass of exchanger, pH, metal ions (Cu, Cd, Fe, Mn, and Ni), and concentration of organic matter on the relative lability of metal species. It was found that the pH and kinetics strongly influence the process of metal complexation by the DM-Cell-PAB system. At all pH levels, Cd, Mn, and Ni showed lower complexation with Cell-PAB resin than Cu and Fe metals. Note that relative lability of metals complexed to aquatic humic substances (AHS) in the presence of Cell-PAB resin showed the following order: Cu≅Fe≫Ni>Mn=Cd. The results presented here also indicate that increasing the AHS concentration decreases the lability of metal species by shifting the equilibrium to AHS–metal complexes. Our results indicate that the system under study offers an interesting alternative that can be applied to in situ experiments for differentiation of labile and inert metal species in aquatic systems.
ACCESSION #
23150798

 

Related Articles

  • Determination of Aminobenzoic Acids by Extraction with a Hydrophilic Solvent Followed by the Non-Aqueous Titration of the Concentrate. Niftaliev, S. I.; Korenman, Ya. I.; Konstantinova, N. A.; Serbulov, Yu. S. // Journal of Analytical Chemistry;Apr2004, Vol. 59 Issue 4, p323 

    The extraction of aminobenzoic acids with hydrophilic solvents (butyl alcohols, acetone, ethyl acetate) from aqueous solutions was studied. Extraction conditions were optimized using methods of experimental design. A method was developed for the selective determination of acids with the...

  • NBT-PABA test.  // Taber's Cyclopedic Medical Dictionary (2009);2009, Issue 21, p1546 

    An encyclopedia entry for "NBT-PABA test," which refers to the N-benzoyl-L-tyrosyl-p-aminobenzoic acid test used to measure the functions of the exocrine pancreas, is presented.

  • Synthesis of γ-amino acid analogues from natural α-amino acids by a radical pathway. M. C. Corvo; M. M. A. Pereira // Amino Acids;Feb2007, Vol. 32 Issue 2, p243 

    Summary.??New ?-amino esters and amides were prepared by a radical 1,4-addition of carbon radicals to acrylic derivatives. ?-Amino acids derivatives holding chiral auxiliaries as radical precursors and different chiral olefins were used and chiral induction on the C-? center was discussed.

  • High-level production of bioactive human beta-defensin-4 in Escherichia coli by soluble fusion expression. Zhinan Xu; Zhixia Zhong; Lei Huang; Li Peng; Fang Wang; Peilin Cen // Applied Microbiology & Biotechnology;Aug2006, Vol. 72 Issue 3, p471 

    Human beta-defensin-4 (hBD4) is a cationic 50-amino acid antimicrobial peptide with three conserved cysteine disulfide bonds. It exhibits a broad antimicrobial spectrum. This study describes the synthesis of hBD4 gene, the heterologous fusion expression of the peptide in Escherichia coli, and...

  • Synthesis of potentially bioactive PABA-related N-(aminoalkyl)lactamic amino acids and esters via selective SAr reactions. Gonçalves, Renato; Abdelnur, Patrícia; Santos, Vanessa; Simas, Rosineide; Eberlin, Marcos; Magalhães, Alviclér; Pérez González, Eduardo // Amino Acids;Jan2011, Vol. 40 Issue 1, p197 

    Potentially bioactive N-(aminoalkyl)lactamic amino acids and esters were synthesized in satisfactory to good yields by SAr reactions of aromatic acids with N-(3-aminopropyl)lactams followed by esterification with tertiary amino alcohols. The addition-elimination SAr mechanism was confirmed by...

  • EphA3 functions are regulated by collaborating phosphotyrosine residues. Guanfang Shi; Gang Yue; Renping Zhou // Cell Research;Nov2010, Vol. 20 Issue 11, p1263 

    Ephrin ligands interact with Eph receptors to regulate a wide variety of biological and pathological processes. Recent studies have identified several downstream pathways that mediate the functions of these receptors. Activation of the receptors by ephrin binding results in the phosphorylation...

  • 4-Hydroxy(acyloxy)-3-methoxy(ethoxy)phenylmethylidene-(3-carboxyphenyl)amines. Dikusar, E.; Kozlov, N.; Potkin, V.; Zelenkovskii, V. // Russian Journal of General Chemistry;Jan2006, Vol. 76 Issue 1, p82 

    Previously unknown Schiff bases were synthesized by reactions of 3-aminobenzoic acid with 4-hydroxy-3-methoxybenzaldehyde, 3-ethoxy-4-hydroxybenzaldehyde, and esters derived therefrom in methanol.

  • Substituent and structural effects on the kinetics of the reaction of N-(substituted phenylmethylene)-m- and -p-aminobenzoic acids with diazodiphenylmethane. Jovanović, Bratislav Ž; Marinković, Aleksandar D.; Vitnik, Željko; Juranić, Ivan O. // Journal of the Serbian Chemical Society;Dec2007, Vol. 72 Issue 12, p1191 

    The rate constants for the reaction of twenty-two N-(substituted phenyl methylene)-m- and -p-aminobenzoic acids with diazodiphenylmethane were determined in absolute ethanol at 30 °C. The effects of substituents on the reactivity of the investigated compounds were interpreted by correlation...

  • Use of an electrochemical method in the synthesis of anesthesin from p-nitrotoluene. Magomedova, Z. M.; Khidirov, Sh. Sh. // Pharmaceutical Chemistry Journal;Apr2009, Vol. 43 Issue 4, p222 

    We report here the use of an electrochemical method to simplify and reduce the number of stages in the chemical synthesis of Anesthesin (the ethyl ester of p-aminobenzoic acid) from p-nitrotoluene. Methods for electrolysis and product extraction are described. The yields per unit current of the...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics