TITLE

Stopped-flow spectrophotometric determination of nM level of Pb(II) using 5,10,15,20-terakis(1-methylpyridinium-4-yl)porphine

AUTHOR(S)
Kawamura, Kunio; Igarashi, Shukuro; Yotsuyanagi, Takao
PUB. DATE
February 2007
SOURCE
Microchimica Acta;Feb2007, Vol. 157 Issue 1/2, p87
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A spectrophotometric determination method for nM levels of Pb(II) has been developed using a stopped-flow spectrophotometer with cationic water-soluble porphyrin. The stopped-flow spectrophotometer allows the monitoring of the incorporation reaction of the Pb(II) ion into 5,10,15,20-terakis(1-methylpyridinium-4-yl)porphine (TMPYP) within a narrow time window (2.5 s) at pH 10.5–12.0 before the Pb-TMPYP complex is replaced with other foreign metal ions, since usually the Pb-TMPYP complex is very labile and readily replaced with other metal ions. This improved the selectivity of Pb(II) determination as compared to the conventional spectrophotometric determination of Pb(II) using water-soluble porphyrins.
ACCESSION #
23591296

 

Related Articles

  • Everything Old is New Again. Hurst, Jeff // Scientific Computing & Instrumentation;Jun2001, Vol. 18 Issue 7, p18 

    Focuses on the Flow Injection Analysis (FIA), a method in analytical chemistry. How the FIA process, analytes and reagents are introduced separately into a flowing carrier stream and mixed; Examples of other analytical techniques in chemistry; Use of the method FIA-LC-MS by researchers; Two...

  • A Stopped Flow Injection – Chemical Relaxation – Catalytic Spectrophotometric Procedure for the Determination of Cobalt. He, Ronghuan; Jiang, Hua; Wang, Jianhua // Microchimica Acta;Jan2003, Vol. 141 Issue 1/2, p93 

    A concentration-jump chemical relaxation catalytic procedure by using stopped flow injection is described with detection by spectrophotometry. The photoreduction of the Fe(III)-bipyridyl complex to Fe(II)-bipyridyl is pre-equilibrated at dark for at least 12 h. This solution is afterwards...

  • Flow-injection Spectrophotometric Determination of N-acetyl-L-cysteine Based on Coupled Redox-complexation Reaction. Kukoč-Modun, Lea; Plazibat, Ivana; Radić, Njegomir // Croatica Chemica Acta;May2011, Vol. 84 Issue 1, p81 

    A flow-injection spectrophotometric method is developed for determination of N-acetyl-L-cysteine (NAC) in pharmaceutical formulations. The method is based on coupled redox-complexation reaction, the first step of which is the reduction of FeIII by NAC; the second one includes the complexation of...

  • Spectrophotometric stopped-flow apparatus suitable for high-pressure experiments to 200 MPa. van Eldik, R.; Gaede, W.; Wieland, S.; Kraft, J.; Spitzer, M.; Palmer, D. A. // Review of Scientific Instruments;May93, Vol. 64 Issue 5, p1355 

    A modified high-pressure, stopped-flow apparatus has been developed to enable kinetic experiments to be monitored spectrophotometrically to 200 MPa, with efficient mixing of the reactant solutions. This apparatus is compact, relatively inexpensive to construct, and the solutions are only exposed...

  • Fiber optic-linear array detection spectrophotometry in combination with dispersive liquid-liquid microextraction for preconcentration and determination of copper. Ezoddin, Maryam; Shemirani, Farzaneh; Jamali, Mohammad // Journal of Analytical Chemistry;Feb2010, Vol. 65 Issue 2, p153 

    In this research, simple, rapid and efficient method, dispersive liquid-liquid microextraction (DLLME) combined fiber optic -linear array detection spectrophotometry (FO-LADS) was developed using a cylindrical micro-cell for preconcentration and determination of Cu(II) in samples. DLLME and...

  • Kinetic spectrophotometric methods for the determination of dothiepin hydrochloride in bulk and in drug formulation. Taha, Elham A. // Analytical & Bioanalytical Chemistry;Aug2003, Vol. 376 Issue 7, p1131 

    Two simple and sensitive kinetic methods for the determination of dothiepin hydrochloride are described. The first method is based on kinetic investigation of the oxidation reaction of the drug with alkaline potassium permanganate at room temperature for a fixed time of 25 min. The absorbance of...

  • Coupled multisyringe flow injection/reactor tank for the spectrophotometric detection of azinphos methyl in water samples. Ornelas-Soto, Nancy E.; Guzmán-Mar, Jorge L.; de Alba, Pedro L. López; Martínez, Leticia López; Barbosa-García, Oracio; Martín, Victor Cerdà // Microchimica Acta;Dec2009, Vol. 167 Issue 3/4, p273 

    A multisyringe flow injection system with spectrophotometric detection is presented as a fast, robust and low-reagent consumption system for the determination of azinphos methyl (AzMe) in water samples. Determination is based on the Griess reaction. The analyte is hydrolyzed and the reaction...

  • Speciation of Manganese Using a Pneumatic Flow Injection Analysis-Tandem Spectrometer System. Noroozifar, Meissam; Khorasani Motlagh, Mozhgam; Akbari, Reza // Turkish Journal of Chemistry;2007, Vol. 31 Issue 3, p293 

    A pneumatic flow injection-tandem spectrometer system, without a delivery pump, was used for the speciation of manganese (Mn). In this system the suction force of the pneumatic nebulizer of a flame atomic absorption spectrometer (FAAS) was used for solution delivery through the manifold. Mn(VII)...

  • Sequential determination of free and total cyanide by flow injection. Angelica, Maria; Marin, Bonadiman; Ganzarolli, Edgard Moreira; Lehmkuhl, Arilson; Souza, Ivan Goncalves De; Roosevelt, Roldao; Queiroz, Urzedo De // Journal of Automated Methods & Management in Chemistry;Jan1999, Vol. 21 Issue 1, p23 

    This study presents a flow injection system for the sequential determination of free (CN-) and total (CN- HCN) cyanide using a potentiometric method which employs two different processes for the determination of these two chemical species. The first process is based on direct detection of CN-...

Share

Other Topics