High-Performance Colorimetric Detection of Thiosulfate by Using Silver Nanoparticles for Smartphone-Based Analysis.

Developing thiosulfate (SO) sensors with silver nanoparticles (AgNPs) for analysis of aqueous solutions with the interference of other anions remains challenging. In this study, we propose a new strategy for excellent selective colorimetric detection of SO. The nonmorphological transition of AgNPs leading to a color change from yellow to brown is verified by UV-vis, TEM, DLS, SEM, and XPS analyses.

Unveiling the adsorption mechanism of zeolitic imidazolate framework-8 with high efficiency for removal of copper ions from aqueous solutions.

Among the heavy metal ions, copper(ii) can cause eye and liver damage at high uptake. The existence of copper ions (Cu(2+)) even with an ultralow concentration of less than 0.1 μg g(-1) can be toxic to living organisms.

Selective colorimetric detection of Cr(iii) and Cr(vi) using gallic acid capped gold nanoparticles.

A colorimetric assay is proposed for the selective detection of Cr(iii) and Cr(vi) via the aggregation-induced color change of gallic acid capped gold nanoparticles (GA-AuNPs). The AuNPs are characterized using UV-vis spectroscopy, transmission electron microscopy (TEM), dynamic light scattering (DLS) and Fourier-transform infrared spectrometry (FT-IR). To detect Cr(iii) and Cr(vi) coexisting in a sample, citrate and thiosulfate were applied to mask Cr(vi) for the detection of Cr(iii), and ethylenediaminetetraacetic acid disodium salt (EDTA) was applied to mask Cr(iii) for the detection of Cr(vi).

The predictive performance and stability of six species distribution models.

Background: Predicting species' potential geographical range by species distribution models (SDMs) is central to understand their ecological requirements. However, the effects of using different modeling techniques need further investigation. In order to improve the prediction effect, we need to assess the predictive performance and stability of different SDMs.

Colorimetric detection of copper and efficient removal of heavy metal ions from water by diamine-functionalized SBA-15.

SBA-15 functionalized with N-[3-(trimethoxysilyl)propyl]ethylene-diamine (TPED) was synthesized and used for the colorimetric detection of Cu(2+) and removal of heavy metal ions in aqueous solutions. Compared to free SBA-15, the adsorption ability of diamine-functionalized SBA-15 (depicted as SBA-TPED) increased remarkably, the maximum adsorption capacity of SBA-TPED for Cu(2+), Pb(2+) and Zn(2+) was 27.22, 96.

Reference valence effects of affective s-R compatibility: are visual and auditory results consistent?

Humans may be faster to avoid negative words than to approach negative words, and faster to approach positive words than to avoid positive words. That is an example of affective stimulus-response (S-R) compatibility. The present study identified the reference valence effects of affective stimulus-response (S-R) compatibility when auditory stimulus materials are used.

[Anti-complement activity of polysaccharide B3-PS2 purified from Herba Scutellariae Barbatae].

The polysaccharide B3-PS2 was extracted and purified from Herba Scutellariae Barbatae through chromatography of DEAE-cellulose and Sephacryl S-300 column. Average molecular weight of B3-PS2 was about 1,100 kD. It was composed of Glc, Gal and Ara in the ratio of 2.

A novel fluorescent distinguished probe for Cr (VI) in aqueous solution.

Salicylaldehyde rhodamine B hydrazone (SRBH) was developed as a new spectrofluorimetric probe for the selective and sensitive detection of CrO(4)(2-) in acidic conditions. The proposed method was based on the special oxidation reaction between non-fluorescent SRBH by potassium dichromate to produce a highly fluorescent rhodamine B, as a product. Under the optimum conditions described, the fluorescence enhancement at 591 nm was good linearly related to the concentration of CrO(4)(2-) from 1.

[Charge-transfer compounds based on TCNQ: synthesis and spectroscopic properties].

Charge-transfer materials based on organic donors and acceptors have been under investigation, beginning with the first reports of conducting salts of organocyanide acceptors such as TCNQ. Charge-transfer compounds of the pi-electron acceptor 7,7,8,8,-tetracyanoquinodimethane (TCNQ) show unusual electrical and magnetic properties. The form of TCNQ has a dramatic effect on the properties of the kinds of charge-transfer compounds.

[Determination of W, Mo and other 8 elements in powder metallurgical materials by ICP-AES].

Samples were dissolved using nitric acid, perchloride acid and hydrofluoride acid in the medium of 0.025 mol x L(-1) EDTA with a kind of standard solutions, and the element contents of Ni, Cu, V, Mn, W, Mo, Co and Cr were determined by ICP-AES method. After investigating the spectral interfere from matrix element and coexistent elements, optimum spectral lines were selected for each analyzed element, and the analytical precision, detection limits and recoveries were measured.

A functionalized gold nanoparticles and Rhodamine 6G based fluorescent sensor for high sensitive and selective detection of mercury(II) in environmental water samples.

A gold-nanoparticles (Au NPs)-Rhodamine 6G (Rh6G) based fluorescent sensor for detecting Hg(II) in aqueous solution has been developed. Water-soluble and monodisperse gold nanoparticles (Au NPs) has been prepared facilely and further modified with thioglycolic acid (TGA). Free Rh6G dye was strongly fluorescent in bulk solution.

A novel fluorescent array for mercury (II) ion in aqueous solution with functionalized cadmium selenide nanoclusters.

Mono-disperse CdSe nanoclusters have been prepared facilely and functionalized with l-cysteine through two steps by using safe and low cost substances. They are water-soluble and biocompatible. Especially these functionalized quantum dots can be stably soluble in water more than for 30 days, and the intensity of fluorescence and absorbance was decreased less than 15% of fresh prepared CdSe colloids.

Functionalized CdS quantum dots-based luminescence probe for detection of heavy and transition metal ions in aqueous solution.

Strong luminescence CdS quantum dots (QDs) have been prepared and modified with l-cysteine by a facile seeds-assistant technique in water. They are water-soluble and highly stable in aqueous solution. CdS QDs evaluated as a luminescence probe for heavy and transition metal (HTM) ions in aqueous solution was systematically studied.

[Study on the ternary complex of FLRX, zinc(II) and BSA by the method of fluorescence].

The influences of fleroxacin (FLRX) on the fluorescence of bovine serum albumin(BSA), zinc(II) on that of bovine serum albumin, and zinc(II) on the of fleroxacin and bovine serum albumin were studied under imitated the physiological condition. It was shown that both fleroxacin and zinc(II) have a powerful ability to quench the BSA fluorescence via a nonradiative energy transfer mechanism. But the fluorescence quenching action of fleroxacin on BSA was much stronger in the presence of zinc (II).

Facile synthesis of water-soluble and size-homogeneous cadmium selenide nanoparticles and their application as a long-wavelength fluorescent probe for detection of Hg(II) in aqueous solution.

Highly luminescent uncoated water-soluble and mono-disperse CdSe nanoparticles (NPs) have been prepared facilely. Uncoated CdSe core NPs possessing a good size distribution was accompanied with long wavelength of fluorescence emission. It is interesting to note that these functionalized NPs are soluble in water medium stably for more than 1 month, and no significant changes were found in the optical characteristics in comparison with fresh CdSe NPs prepared.

Hierarchically imprinted organic-inorganic hybrid sorbent for selective separation of mercury ion from aqueous solution.

A new type of hierarchically organic-inorganic hybrid sorbent was prepared by a double-imprinting approach for the selective separation of Hg(II) from aqueous solution. In the imprinting process, both mercury ions and surfactant micelles (cetyltrimethylammonium bromide, CTAB) were used as templates, N-[3-(trimethoxy-silyl)propyl]ethylenediamine (TPED) as functional monomer, and tetraethoxysilane (TEOS) as cross-linking agent. The mercury ions and surfactant were removed from sorbent via acid leaching and ethanol extraction, respectively.

[Simultaneous determination of phenol and resorcinol by dual-wavelength spectrophotometric linear regression method].

Spectrophotometric simultaneous determination of phenol and resorcinol was studied. The absorption spectra of these two components severely overlap in ultraviolet spectral range. In the wavelength range of 250-290 nm, the absorbances of phenol and resorcinol were measured with an internal of 0.

[Fluorimetric determination of trace ruthenium in anode slime of alkali chloride factory with 1,10-phenanthroline].

The complex reaction of ruthenium with 1,10-phenanthroline was studied. In the medium of pH 5 HAc-NaAc buffer and NH2OH * HCl solution, ruthenium reacts with 1,10-phenanthroline to form a 1 : 3 complex by heating in a boiling water bath for 5 min. The fluorescence peak excitation wavelength is 448 nm, and the emission peak wavelength is 586 nm.

[Hydrothermal synthesis of Co9S8 nanocrystalline aggregations and spectral study].

Co9S8 nanocrystalline aggregations were synthesized in hydrazine hydrate (N2H4 x H2O) solvent at 180 degrees C for 12 h through a hydrothermal method using cobalt sulfate hydrate (CoSO4 x 7H2O) and sodium sulfate (Na2SO3) as the starting materials. The prepared samples were characterized using X-ray diffraction (XRD), field-emission scanning electron microscope (FE-SEM), and transmission electron microscope (TEM). FTIR spectrum was measured using Fourier-transform infrared spectrometer.

[Synthesis and infrared spectroscopic study of 1-D magnetic chain compound based on [BrBzPy [Ni (dmit) 2]].

The synthesis and functional study of one-dimensional free radical-metal chain compound has been a hotspot task in molecule material, especially in composing high Tc molecule ferromagnet. A new compound [BrBzPy] [Ni(dmit)2] has been prepared and characterized. The crystal structure at room temperature was determined.

[Spectrophotometric simultaneous determination of pyrocatechol, resorcinol and hydroquinone by LM-BP neural network].

By means of artificial neural network and Levenberg Marquardt Back Propagation (LM-BP) train algorithm, the three components of pyrocatechol, resorcinol and hydroquinone were determined simultaneously. The absorption spectra of these three components severely overlap in ultraviolet spectral range. Three wavelengths at 283.

[Preparation and spectroscopic study of two new charge transfer salts].

TCNQ (TCNQ= tetracyanoquinodimethane) salts have good conductivity. The magnetic properties of substituted benzylpridiniums, such as ferromagnetism, antiferromagnetism and spin Peierls transition, have widely been investigated. In order to obtain some new materials with both conductivity and magnetism, two new organic salts, [NO2BzPy]Cl (1) and [NO2 BzPyNH2]Cl (2), were synthesized and characterized.

[Characteristics of IR spectra for oxadiazole].

Infrared spectra of 2,5-o-dimethylbenzene-1,3,4-oxdiazole and 2,5-m-dimethylbenzene-1,3,4-oxdiazole were studied. Their principal vibration bands were assigned and the characteristics of their IR spectra were compared with each other.

[Study on FTIR spectra of HDEHP and DMHPA in different states].

FTIR spectra of pure di (2-ethylhexyl) phosphoric acid (HDEHP), di (1-methylheptyl) phosphoric acid (DMHPA) and their sodium salts, microemulsions, extracted organic phases containing rare earth were studied. It was seen that the microstructures of the two extractants changed with their different alkyl structures and aggregation states.

[Study on the properties and microstructure of the gel in the extracted organic phase containing DMHPA-RE(III)].

The content of Na+, RE3+ and the swelling characteristic of dried gel containing DMHPA[di-(1-methylheptyl)phosphoric acid]-RE(III) have been studied by FTIR and ICP/AES spectroscopy methods. The result demonstrates that (1) the mechanism of microemulsion extracting lanthanide ions is complicated and it is difficult to be explained with simple chemical equations, (2) The dried gel can swell, but the aggregation states and microstructure change as the used solvents and its content vary, (3) The far infrared spectroscopy shows that there are ring structures in the gel and differences of the ability in coordination with DMHPA between light and heavy lanthanide ions.