The present work reports the detection of melamine (artificial protein) in milk using mercapto-propionic acid capped cadmium selenide (m-CdSe) quantum dots (QDs) as fluorescent labels, denoted as quanta-sensor. The m-CdSe QDs were prepared using aqueous chemical synthesis method and were charact...

A number of complexes of trivalent iridium with 1:10-phenanthroline (phen) have been isolated. The complexes are of three types: (a) tris-chelated, [Ir(phen)3]X3.nH2O (X  Cl, Br, I, ClO4); (b) bis-chelated, [Ir(phen)2X2]X.nH2O (X  Cl, Br); (c) those containing a bis-chelated cation and a mon...

The first indium sulfate coordination complex, (2,2′-bipy)[In2(OH)2(H2O)](SO4)2 (2,2′-bipy=2,2′-bipyridyl) was hydrothermally synthesized and characterized by single-crystal X-ray diffraction (XRD), the powder XRD, elemental analysis, inductively coupled plasma (ICP) analysis, thermogravimetr...

Electrochromic films grown anodically on Pd and Au electrodes in RbCl and RbBr solutions have been studied by Raman microprobe spectroscopy. These polycrystalline films have been identified to be Rb2PdCl4, Rb2PdCl6, Rb2PdBr4, Rb2PdBr6, RbAuCl4 and RbAuBr4.

Thermodynamic parameters for the protonation of AsO43− and for the interaction with Mg2+, Ca2+ and Sr2+ were reported, comprehensive also of their dependence on ionic strength, considering the 0.1 ≤ I ≤ 1 M range and using NaCl as background salt. The same speciation models were obtained for M...

Removal of arsenic (As) from drinking water sources is much needed worldwide, and point-of-use (POU) treatment could be an effective solution for residential applications. Adopting existing removal technologies that are successful in large-scale treatment to POU units, however, is rather ineffec...

The geochemical behaviour of phosphate and arsenate ions in soil and aquatic systems is determined by the presence of mineral surfaces and major ions. Information about the distribution of oxyanions over the solid and solution phases is essential for understanding the transport, bioavailability ...

The i.r. spectra of some phosphate—arsenate strontium apatites and phosphate—vanadate strontium apatites have been studied and the assignments of their bands realized. It is shown that the symmetry of the distinct anions depends on the apatitic composition and it is suggested the existence of ...

Crystals of a strontium monohydrogen arsenate were synthesized by hydrothermal method. The crystal structure of SrHAsO4 was re-investigated from single crystal X-ray data and by Charge-Distribution (CHARDI) investigation. The crystal is triclinic, space group P1−, a = 7.361(1) Å, b = 7.067(1) Å,...

In this study, mesoporous carbonated TiO2 nanoparticles were synthesized by sol-gel route using a complex [Ti(OH2)6]3+·3Cl− and a modifying agent Na2CO3 and used as an adsorbents for Sr(II) removal from aqueous medium. The characterization of nanoadsorbents was accomplished using XRD, SEM, EDS,...

The i.r. spectra of the calcium—strontium arsenate apatites have been studied, and the OH, AsO4, CO3 and cation—oxygen fundamental frequencies assigned on the basis of group theoretical arguments. It is seen that CO3 ions are included in the lattice. It is demonstrated that Ca and Sr undergo c...

The modification of the fly ash (FA) by magnetite (M) was performed to obtain FAM adsorbent with improved adsorption efficiency for arsenate removal from water. The novel low cost adsorbents are characterized by liquid nitrogen porosimetry (BET), scanning electron microscopy (SEM), X-ray diffrac...

We measured the bulk grain concentrations of arsenic (As), along with rubidium (Rb) and strontium (Sr) as indicators of phloem and xylem transport respectively, in rice (Oryza sativa cv. Italica Carolina) pulsed with arsenate (As(V)) at two exposure concentrations for 5 day periods at progressiv...

Mesoporous titania samples modified by sodium arsenate to form arsenate functionalities were synthesized using titanium aqua complex [Ті(ОН2)6]3+·3Cl− and salt Na3AsO4 as precursors. The structure, morphology, and texture of the samples were characterized using XRD, IR spectroscopy, TG-DTA, ...

The growing importance of triarylarsines as ligands for transition metal catalysis has sparked recent interest in new synthetic routes to tertiary arsines that avoid hazardous arsenous chloride reagents. However, safer methods for the synthesis of lesser explored arsine heterocycles, especially ...

Tris(triorganostannyl) arsenites, (R3SnO)3As (R = Prn, Bun, Ph) and triorganostannyl alkylene arsenites, R3SnOAsOGO [R = Prn, Bun, Ph and G = -CH2- CH2-, -CH(CH3)CH2-, -CH(CH3)(CH3)CH-, -CH- (CH3)CH2CH2-, -C(CH3)2(CH3)2C-, -C(CH3)2- CH2(CH3)CH-] have been obtained for the first time as white sol...

A novel method, incomplete suppressed conductimetric detection, has been developed for the determination of anions of very weak acids. The principle of the method was discussed. Theoretical considerations involved the choice of background conductance and its effect on linearity and detection lim...

In the poisonous incident case occurred in Japan, clarification of the identity between seized poisons and retrieved from crime scene is strictly required from the court. In this case, arsenous acid was used as a poisonous material and, seized one from suspect’s house was only twenty particles....

The dissociation constant of meta-arsenous acid (HAsO2) was accurately determined from spectrophotometric measurements, combined with volumetric methods. The measurement of pH of the analyte solution containing HAsO2, which was titrated with sodium hydroxide, was achieved by the spectrophotometr...

The ultraviolet spectra of dilute, aqueous arsenic (III)-containing solutions have been measured from 25 to 300 °C at the saturated vapour pressure. From these measurements, the equilibrium constant was obtained for the reactionH3AsO3⇄H++H2AsO3-;