scholarly journals Adsorption of some Metal Ions from Aqueous Solution on Iraqi Rice Bran and Its Relation to the Physical Properties of these Metal Ions

2014 ◽  
Vol 11 (4) ◽  
pp. 1604-1611
Author(s):  
Baghdad Science Journal
Keyword(s):  
Aqueous Solution ◽  
Adsorption Isotherm ◽  
Metal Ions ◽  
Rice Bran ◽  
Ionic Radius ◽  
Divalent Cations ◽  
Atomic Absorption Spectrophotometry ◽  
Waste Materials ◽  
Absorption Spectrophotometry ◽  
Adsorptive Behavior

Adsorption studies were carried out to test the ability of the Iraqi rice bran (Amber type) to adsorb some metals divalent cations (Cd2+, Co2+, Cu2+, Fe2+, Ni2+, Pb2+, and Zn2+) as an alternative tool to remove these pollutants from water. The Concentrations of these ions in water were measured using flame and flamless atomic absorption spectrophotometry techniques. The applicability of the adsorption isotherm on Langmuir or Freundlisch equation were tested and found to be dependent on the type of ions. The results showed different adsorptive behavior and different capacities of the adsorption of the ions on the surface of the bran. The correlation between the amounts adsorbed and different cation parameters including (electronegativity, ionic radius, and the second ionization potential) were tested. This study showed the applicability of bran, as a cheap and available waste materials, to remove different cations from solution.

scholarly journals Dynamic ionic radius of alkali metal ions in aqueous solution: a pulsed-field gradient NMR study

RSC Advances ◽  
2021 ◽  
Vol 11 (33) ◽  
pp. 20252-20257
Author(s):  
Kikuko Hayamizu ◽  
Yusuke Chiba ◽  
Tomoyuki Haishi
Keyword(s):  
Aqueous Solution ◽  
Alkali Metal ◽  
Metal Ions ◽  
Field Gradient ◽  
Ionic Radius ◽  
Alkali Metal Ions ◽  
Pulsed Field Gradient Nmr ◽  
Pulsed Field ◽  
Nmr Study ◽  
Stokes Radius

Stokes radius (dynamic ionic radius) of the alkali metal ions versus the ionic radius (Rion) at 303 K. The dotted line is a guide for the 1 : 1 relation.

Determination of Free and Bound Cd, Zn, Cu, and Ag Ions in Lobster (Homarus americanus) Digestive Gland Extracts by Gel Chromatography Followed by Atomic Absorption Spectrophotometry and Polarography

1993 ◽  
Vol 76 (4) ◽  
pp. 794-798 ◽  
Author(s):  
Chiu L Chou ◽  
John F Uthe ◽  
Robert D Guy
Keyword(s):  
Molecular Weight ◽  
Metal Ions ◽  
Atomic Absorption ◽  
Gel Permeation Chromatography ◽  
Weight Fraction ◽  
Atomic Absorption Spectrophotometry ◽  
Divalent Metal ◽  
Divalent Metal Ions ◽  
Absorption Spectrophotometry ◽  
Gel Permeation

Abstract Gel-permeation chromatography followed by atomic absorption spectrophotometric and polarographic analyses were used to measure free and bound divalent metal ions in lobster digestive gland extracts prepared with or without oc-toluenesulfonyl fluoride, a protease inhibitor. Chromatography on Sephadex G-50 or G-100 yielded 3 UV-absorbing peaks, which corresponded, respectively, to the void volume, a medium molecular weight fraction, and a low molecular weight fraction that contained free divalent metal ions. In protease-inhibited extracts, only Zn+2 was found, whereas Cd, Cu, and Ag were bound in high and medium molecular weight fractions. Cd+2 and Zn+2 were rapidly released from their bound forms in the absence of a protease inhibitor, and their presence was confirmed by polarography with EDTA. Gel-permeation chromatography coupled with atomic absorption spectrophotometry offers a rapid method for following changes in the concentrations of bound and free metal ions during processing of shellfishbased foodstuffs.

Influence of Ions and Chelating Agents on the Haemolymphacetylcholinesterase of Mytilus edulis

1978 ◽  
Vol 33 (11-12) ◽  
pp. 851-858 ◽  
Author(s):  
Dettmar von Wachtendonk ◽  
Jutta Neef
Keyword(s):  
Enzyme Activity ◽  
Mytilus Edulis ◽  
Chelating Agents ◽  
Competitive Inhibition ◽  
Divalent Cations ◽  
Atomic Absorption Spectrophotometry ◽  
Ammonium Ions ◽  
Salicylic Aldehyde ◽  
Inorganic Cations ◽  
Absorption Spectrophotometry

By use of different inhibitors as well as atomic absorption spectrophotometry it has been shown that the haemolymph-acetylcholinesterase (E. c. 3.1.1.7) of the sea mussel Mytilus edulis is a me- talloprotein containing 2,95 Fe2+ -ions per subunit. All inhibitors used (1,10-phenanthroline, salicylic aldehyde, 2,2′-dipyridyl, 8-hydroxyquinoline) showed a non-competitive inhibition, which was not pH- dependent. Some divalent cations caused a marked increase of the enzyme activity, some heavy metals inhibited the enzyme almost completely; monovalent inorganic cations did not influence the enzyme at all. Besides NaF and Na2SiF6, which showed a non-competitive inhibition comparable to the inhibition observed with the chelating agents, and NaN3 , whose mode of action was not identifiable, no inhibition by different mono- and divalent inorganic anions was to be observed. Ammonium ions caused no enzyme inhibition, but length the inhibition power of substituted ammonium ions increased with an increasing C-chain. The influence of some organic solvents on the enzyme activity is demonstrated.

scholarly journals ELEMENTAL ANALYSIS OF PRECIPITATES FORMED IN NUCLEI BY ANTIMONATE-OSMIUM TETROXIDE FIXATION

1972 ◽  
Vol 20 (7) ◽  
pp. 518-526 ◽  
Author(s):  
S. S. SPICER ◽  
A. A. SWANSON
Keyword(s):  
Lymph Nodes ◽  
Osmium Tetroxide ◽  
Divalent Cations ◽  
Atomic Absorption Spectrophotometry ◽  
Cervical Lymph Nodes ◽  
Isolated Nuclei ◽  
Absorption Spectrophotometry ◽  
Osmium Tetroxide Solution ◽  
Nuclear Activation ◽  
Nuclear Activation Analysis

Elements retained in cervical lymph nodes, isolated hepatic nuclei and salt-impregnated gels by fixation with antimonate- or pyrophosphate-containing and other osmium tetroxide solutions were assayed by nuclear activation analysis or by atomic absorption spectrophotometry. Salts preserved by the antimonate-osmium tetroxide fixative in lymph nodes, isolated nuclei and a KCl-enriched gel consisted almost entirely of potassium antimonate. The K+ in the precipitates in these specimens appeared to derive partially from that in the fixative solution and partially from that in the specimen. Salts preserved by the antimonate-osmium tetroxide fixative in an NaCl-supplemented gel consisted partly of potassium antimonate derived from the fixative as in unsupplemented gels and partly of sodium antimonate. The Na+ precipitated in this gel amounted to less than one-half that originally present. In comparison the pyrophosphate-osmium tetroxide solution retained higher levels of K+ in lymph nodes, nuclei and the KCl gel, but the potassium pyrophosphate was not evident as electron-opaque precipitates. The latter fixative was less effective in preserving Na+ in the NaCl gel. The pyrophosphate-containing fixative, which was about twice as efficient as the antimonate-containing solution in retaining the divalent cations, preserved 70% of the Mg++ and 100% of the Ca++ added to gels.

scholarly journals Simultaneous Spectrophotometric Determination of Chromium(VI) and Vanadium(V) by using 3,4-Dihydroxybenzaldehyde isonicotinoyl hydrazone (3,4-DHBINH)

2009 ◽  
Vol 6 (s1) ◽  
pp. S459-S465 ◽  
Author(s):  
Lakshmi Narayana ◽  
Suvarapu ◽  
Adinarayana Reddy Somala ◽  
Prathima Bobbala ◽  
Hwang Inseong ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Metal Ions ◽  
Sodium Acetate ◽  
Atomic Absorption Spectrophotometry ◽  
Photometric Method ◽  
Sodium Acetate Buffer ◽  
Absorption Spectrophotometry ◽  
Chromium Vi ◽  
Highly Sensitive

A simple, rapid, highly sensitive and new simultaneous spectro- photometric method is proposed for the analysis of chromium(VI) and vanadium(V) without separation by using 3,4-dihydroxybeznaldehyde isonicotinoyl hydrazone (3,4-DHBINH). The reagent reacts with the two metal ions in acetic acid-sodium acetate buffer of pH 5.5 and gives maximum absorbances at 400 nm and 360 nm for chromium(VI) and vanadium(V), respectively. Both the metal ions gives 1: 1 (M:L) complexes with the reagent. Effect of various diverse ions also studied. The instability constants for the two complexes were also evaluated. This method was successfully applied for the determination of chromium(VI) and vanadium(V) in various spiked samples. The validity of the method was checked by comparing with the results obtained by atomic absorption spectrophotometry.

scholarly journals Simultaneous Partition Experiment of Divalent Metal Ions between Sphalerite and 1 mol/L (Ni, Mg, Co, Fe, Mn)Cl2 Aqueous Solution under Supercritical Conditions

Minerals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 435
Author(s):  
Etsuo Uchida ◽  
Keiko Wakamatsu ◽  
Naoki Takamatsu
Keyword(s):  
Aqueous Solution ◽  
Partition Coefficient ◽  
Metal Ions ◽  
Ionic Radius ◽  
Vertical Axis ◽  
Divalent Metal ◽  
Divalent Metal Ions ◽  
Hydrothermal Conditions ◽  
Coefficient Versus ◽  
Bulk Partition Coefficient

A simultaneous partition experiment of divalent metal ions was performed between sphalerite and 1 mol/L (Ni, Mg, Co, Fe, Mn)Cl2 aqueous solution under supercritical hydrothermal conditions of 500–800 °C and 100 MPa. The bulk partition coefficient that was defined by KPB(ZnS) = (xMeS/xZnS)/(mMeaq/mZnaq) followed the order of Zn ≑ Co ≑ Ni > Fe > Mn > Mg at all temperatures. In the partition coefficient versus ionic radius (PC–IR) diagrams with the logarithmic value of the bulk partition coefficient (log KPB(ZnS)) on the vertical axis, and the ionic radius of the six-fold coordinated site on the horizontal axis, Ni shows a positive partition anomaly, and the other elements were almost on the PC–IR curve. Based on the PC–IR curve, the optimum ionic radius for sphalerite existed where the ionic radius was slightly larger than Zn (~0.76 Å). A Ni positive partition anomaly may result from its large electronegativity.

scholarly journals Can zinc supplementation ameliorate cadmium-induced alterations in the bioelement content in rabbits?

2017 ◽  
Vol 68 (1) ◽  
pp. 38-45 ◽  
Author(s):  
Zorica Bulat ◽  
Danijela Đukić-Ćosić ◽  
Biljana Antonijević ◽  
Aleksandra Buha ◽  
Petar Bulat ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Nitric Acid ◽  
Perchloric Acid ◽  
Zinc Supplementation ◽  
Atomic Absorption Spectrophotometry ◽  
Control Group ◽  
Beneficial Effects ◽  
Absorption Spectrophotometry ◽  
Group A ◽  
Induced Changes

Abstract The study was designed to investigate the influence of zinc (Zn) supplementation on cadmium-induced alterations in zinc, copper (Cu), and magnesium (Mg) status in rabbits. For this purpose, the concentrations of cadmium (Cd), Zn, Cu, and Mg were estimated in the blood, liver, kidney, and bone. The rabbits were divided in a control group, a Cd group-animals intoxicated orally with Cd (10 mg kg-1 bw, as aqueous solution of Cd-chloride), and a Cd+Zn group-animals intoxicated with the same dose of Cd and co-treated with Zn (20 mg kg-1 bw, as aqueous solution of Zn-sulphate). Solutions were administered orally, every day for 28 days. Sample mineralisation was performed with concentrated nitric acid (HNO3) and perchloric acid (HClO4) (4:1) and metal concentrations were determined by atomic absorption spectrophotometry (AAS). Zinc supplementation improved some of Cd-induced disturbances in bioelement levels in the investigated tissues. Beneficial effects of Zn on Zn and Cu levels were observed in blood, as well as on the Cu kidney level. The calculated values for Cu/Zn, Mg/Zn, and Mg/Cu ratios in blood suggest that Zn co-treatment reduces Cd-induced changes in bioelement ratios in blood.

Analysis of Lead Heavy Metal (Pb) Contamination on Matte Lipstick Preparations for Sale in Banda Aceh City Aceh Market

2020 ◽  
Vol 2 (1) ◽  
Author(s):  
Rizki Andalia ◽  
Mulia Aria Suzanni ◽  
Rini Rini
Keyword(s):  
Heavy Metal ◽  
Atomic Absorption ◽  
Atomic Absorption Spectrophotometry ◽  
The Body ◽  
Permissible Limit ◽  
The Sun ◽  
Absorption Spectrophotometry ◽  
Pb Contamination ◽  
Body Organ ◽  
Banda Aceh

Lipstick or lip dye is a cosmetic dose that serves to coloring, decorative the lips, as a moisturizing material and protect the lips from exposure the sun to provide optimum results. Lipstick should not contain chemicals such as lead (Pb) because the Pb is a heavy metal that is very dangerous when continuously used on the skin, because it will be absorbed into the blood and attack the body organ causing the onset of disease. According to BPOM that the lead rate on the lipstick does not exceed the permissible limit of 20 mg/kg or 20 ppm.This research aims to know the levels contained in the samples are 4 brands of matte lipstick that are sold in the Aceh market in Banda Aceh City with the method of atomic absorption spectrophotometry (AAS). The results showed that on the 4 brands of lipstick matte contain heavy metal lead (Pb) with a rate still qualified allowed by BPOM  is samples A, B, C, and D, respectively at 0.24 ppm; 0.10 ppm; 2.87 ppm and 1.32 ppm, so that the 4 brands of lipstick matte are still used.

Parameterization of Divalent Cations for Coarse-Grained Simulations

2020 ◽  
Author(s):  
Florencia Klein ◽  
Daniela Cáceres-Rojas ◽  
Monica Carrasco ◽  
Juan Carlos Tapia ◽  
Julio Caballero ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Metal Ions ◽  
Molecular Dynamics Simulations ◽  
Divalent Cations ◽  
Computational Cost ◽  
Data Bank ◽  
Coarse Grained ◽  
Interaction Parameters ◽  
Dynamics Simulations ◽  
Dynamical Description

<p>Although molecular dynamics simulations allow for the study of interactions among virtually all biomolecular entities, metal ions still pose significant challenges to achieve an accurate structural and dynamical description of many biological assemblies. This is particularly the case for coarse-grained (CG) models. Although the reduced computational cost of CG methods often makes them the technique of choice for the study of large biomolecular systems, the parameterization of metal ions is still very crude or simply not available for the vast majority of CG- force fields. Here, we show that incorporating statistical data retrieved from the Protein Data Bank (PDB) to set specific Lennard-Jones interactions can produce structurally accurate CG molecular dynamics simulations. Using this simple approach, we provide a set of interaction parameters for Calcium, Magnesium, and Zinc ions, which cover more than 80% of the metal-bound structures reported on the PDB. Simulations performed using the SIRAH force field on several proteins and DNA systems show that using the present approach it is possible to obtain non-bonded interaction parameters that obviate the use of topological constraints. </p>

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