Advanced Materials Research Vols. 554-556

Abstract: A spectrophotometric method for the determination of ruthenium (III) is described, based on its catalytic effect on the oxidation reaction of 2-[(3,5-dibromo-2-pyridy)azo]-5-diethylaminophenol (3,5-diBr-PADAP) with potassium periodate in 0.008 mol/L sodium hydroxide medium and in the presence of OP emulsifier (p-iso-octyl phenoxy polyethoxy ethanol) at 100 °C. The above reaction is followed spectrophotometrically by measuring the decrease in the absorbance at 530 nm for the catalytic reaction of 3,5-diBr-PADAP. The calibration curve for the recommended method was linear in the concentration range over 0.04 µg/L–1.0 µg/L and the detection limit of the method for Ru (III) is 0.012 µg/L. The influence of the factors such as acidity, concentration of reactants, reaction time, temperature and co-existing ions on the reaction is discussed. The optimum conditions of reaction are established and some kinetic parameters are determined. The apparent activation energy of catalytic reaction is 100.48 kJ/mol. The relative standard deviation for the determination of ruthenium (III) at the concentration of 0.02 µg/25mL is calculated to be 2.30 % (n=11). In combination with distilled separation, the method has been successfully applied for the determination of trace ruthenium (III) in some ores and metallurgy products with the relative standard deviations (RSD) over 1.8 %–2.9 % and the recovery over 98.1 %–103.1 %.

Abstract: Carbohydrates are the main source which required to maintain energy equilibrium and normal life activities. In acorn kernel, soluble polysaccharides and starch are the main carbohydrate. In order to accurately measure the carbohydrate content of the acorn kernel in Nanjing Area. Dual-wavelength spectrophotometry and anthrone-sulfuric methods were applied to measure the content of amylose, amylopeetin and soluble polysaccharides,respectively.The other two samples were simultaneously measured for comparative analysis.Testing results show that acorn kernel contain about 79.40% of starch, amylopectin content was up to 59.01%, polysaccharide content is 6.53%.The results indicate that acorn kernel was an important raw material for preparing food, feed and starch-based composites.

Abstract: In this paper, the column chromatography technology on the separation of components of polypropylene fiber spin-finishes was studied. After determining the optimum separation condition, the column chromatography was used to separate and quantitatively analyze the main components of polypropylene fiber spin-finishes. The results showed this spin-finishes was mainly made up of four components, of which A: 1.85 %; B: 44.81 %; C: 27.58 %; D: 25.76 % by weight respectively.

Abstract: To study the fatty acid composition and analysis the variation among the samples of tung oil collected from Guangxi，Chongqing, Hunan, Hubei and Guizhou Provinces of China．Gas chromatography-mass spectrometry(GC-MS) were employed to determine the fatty acid composition of tung oil．The results show that the main composition of the tung oil in China are n-hexadecanoic acid, linoleic acid, oleic acid, stearic acid, α-octadecatrienoic acid, β-octadecatrienoic acid. Tung oil contains octadecatrienoic acid 72.56～88.59% and polyunsaturated fatty acids 80.26~92.39%. The content of octadecatrienoic acid and polyunsaturated fatty acids in tung oil are different between different regions and different varieties.

Abstract: The characteristics of structural and properties of four sodium lignosulfonate (LS) fractions with narrow molecular weight (Mw) distribution isolated by gel column chromatography were investigated with infrared spectroscopy, elemental analysis, 13C NMR analysis, fluorescence spectroscopy and thermogravimetric analysis. LS with higher Mw possesses more aryl ring structural units and the side-chain of the structural unit is mostly composed of propanol rather than propane. With the increase of Mw of LS, the contents of sulfonic group and methoxy group decrease. The critical aggregation concentration (CAC) of LS aqueous solution was determined by fluorescence spectroscopy, which shows that the CAC of LS with higher Mw is lower, indicating that the LS molecule with low Mw is easier to aggregate. TGA results indicate that the weight loss of LS tends to be slow and the thermal stability enhances with the increase in Mw. The dispersive effect of LS with different Mw to dimethomorph suspension shows that the sediment layer thickness and index of dispersity and stability both decease with increasing Mw of LS, which indicates that LS with higher Mw has a better dispersion performance.

Abstract: The natural mordenite was treated hydrothermally with NaOH solutions, either with or without fusion with NaOH powder as pretreatment. Zeolite Na-P and analcime were identified as the reacted products, depending on the reaction conditions. The zeolites were identified by X-raydiffraction, and their cation exchange capacity (CEC) was determined. Zeolite Na-P has higher CEC (338 meq/100g) contrasted with the mordenite (181 meq/100g). Further more, the uptakes of NH4+ onto the zeolites have also been investigated. The Na-P has faster exchange rate, higher exchange amounts and better regeneration ability. The ammonium removal efficiency for the Na-P is above 90% at the ammonium initial concentrations less than 150 mg NH4+/g. It seemed that Na-P was fit for the further treatment of waters polluted with ammonium.

Abstract: A reversed-phase high performance liquid chromatographic method was established for the simultaneous determination of tanshinones in three processing products of white flower Radix salvia miltiorrhiza. Cryptotanshinone, tanshinone IA and tanshinone IIA were successfully separated on a Yilite C18 column (250 mm x 4.6 mm, 5 µm). The mobile phase was a mixture of methanol, water, tetrahydrofuran and glacial acetic acid (70:24:5:1, v/v/v/v), employing isocratic elution at a flow rate of 1.0 mL/min. Detection was 254 nm. Regression equations revealed good linear relationship between the peak areas of the compounds and their concentrations (correlation coefficients: 0.9994 for cryptotanshinone, 0.9996 for tanshinone I A and 0.9996 for tanshinone IIA). The recoveries were between 98.03 % and 103.1 %. The method is simple, accurate and effective and can be used to determine the contents of tanshinones in processing products of Salvia miltiorrhiza bge. f. alba, and the contents of three tanshinones presented the stir-frying processing＜the crude drugs＜the wine prosessing.

Abstract: In this paper, adsorption performance of Zn(II) in simulative waste water by kaolin was studied, and the influences of solution initial pH value, temperature, adsorption time, concentration of Zn(II) were tested. Moreover, the thermodynamic parameters and kinetic equation were calculated. The results show that Zn(II) adsorption capacity firstly increases and then decreases as the pH increases, and the higher temperature, the better adsorption capacity. The Zn(II) adsorption occurs mainly within 60 minutes, and then leveling off. The calculations show that linear correlation coefficient (R2) of langmuir equation is better than the freundlich model fitting results, and Zn(II) adsorption can occur spontaneously, is an endothermic and entropy increasing process. In addition, first-order kinetic equation is more suitable for the description of Zn(II) adsorption mechanism, and adsorption activation energy equals 21.51 kJ•mol^-1.

Abstract: Abstract. The novel tetraphenylethylene (TPE) based sensor 1 bearing bis(2-pyridin-2-ylmethyl) amine (BPA) unit and BODIPY unit linked with triazole moieties could be obtained by click reaction efficiently. It was employed as a fluorescence probe for the selective recognition of Cu²⁺ and Co²⁺. They form stable 1:1 stoichiometric complexes and the lowest limit of detection was 1×10-7 M.

Abstract: Poly (ethylene 1-octene) (POE) was functionalized to varying degrees with maleic anhydride (MA) by melt grafting processes. Fourier transform infrared spectra (FT-IR) confirmed that maleic anhydride was successfully grafted onto the POE. The POE-g-MAH elastomers were used to toughen Polybutylene terephthalate(PBT). The mechanical properties, morphology and the dispersal phase size were investigated. Results showed that the grafting degree strongly influenced the morphology, mechanical properties and the dispersal phase size. All results in this paper were consistent, and showed good interaction between POE and PBT, which was proven by the mechanical properties of blends.