ZrC-桑色素络合物在碳糊电极上的二次导数吸附伏安法测定Zr的研究

研究了Zr 桑色素络合物在碳糊电极正电位区的吸附伏安行为 ,并利用其在 0 .74V处的二次导数吸附氧化峰电流与Zr(Ⅳ )浓度为 6 .0× 10 -9～ 2 .0× 10 -6mol/L呈线性而测定Zr;检出限为 3.0× 10 -9mol/L(S/N =3)。最佳测定条件为 :2 .0mol/LHCl、1.0× 10 -5mol/L桑色素 ;富集电位为 0V(vs .SCE) ;扫描速度为2 5 0mV/s。该法不需萃取分离 ,可直接用于岩石样品中Zr的测定 ,结果满意     

桑色素金属(Ⅱ)固体配合物的抗氧性研究

本文报道了五种金属(Ⅱ)桑色素固体配合物的合成。通过元素分析、溶解度、摩尔电导、红外光谱、热重差热、核磁共振氢谱和荧光分析测定了配合物的组成和性质,结果表明配合物组成为ML₂·nH₂O[M=Mn(Ⅱ)、Co(Ⅱ)、Ni(Ⅱ)、Cu(Ⅱ)、Zn(Ⅱ);L=Morin(失去2′-OH中质子);n=2或3]。并对配体、配合物进行了脂质过氧化物生成的抑制和清除O₂^-·自由基的对比研究。     

痕量钨钼联合测定的研究

研究了十六烷基三甲基溴化铵（ＣＴＭＡＢ）对钼（Ⅵ）－桑木色素（ｍｏｒｉｎ）络合物荧光的增敏作用。建立了Ｍｏ（Ⅵ）－ｍｏｒｉｎ－ＣＴＭＡＢ体系荧光法测定Ｍｏ（Ⅵ）的新方法，并以酸效应实现了对钨和钼的联合测定。测定Ｍｏ（Ⅵ）的线性范围为０．０１～０．４μｇ／ｍＬ，检出限为０．５ｎｇ／ｍＬ。本法用于直接测定豆类及牛血清中的钼和温泉水中钨和钼的联合测定，得到满意的结果。     

Triton X-100增敏桑色素荧光法测定痕量三苯基锡

pH4～5的介质中，三苯基锡（TPhT）与过量的桑色素（Morin）迅速形成络合物，此络合物能发较强的荧光，在适量的TritonX－100存在下，由于TritonX－100的增敏作用荧光大大增强。λex／λem＝415／525nm，三苯基锡在0．05×10－6～1．4×10－6mol／L范围内与荧光强度呈良好的线性关系，检出限1．2×10－9mol／L，用于实际水样测定，结果令人满意。     

Alcohol‐based deep eutectic solvent as a carrier of SiO2@Fe3O4 for the development of magnetic dispersive micro‐solid‐phase extraction method: Application for the preconcentration and determination of morin in apple and grape juices,diluted and acidic extract of dried onion and green tea infusion samples

In this study, a hydrophilic deep eutectic solvent was synthesized as a carrier and disperser of magnetic nanoparticles based on ferrofluid and used to develop the dispersive micro‐solid‐phase extraction method. Ethylene glycol/tetramethylammonium chloride deep eutectic solvent and SiO₂@Fe₃O₄ were used to provide the highly stable ferrofluid with strong sorbing properties without any additional stabilizer, which was employed to extract and determine morin in apple and grape juices, diluted and acidic extract of dried onion, and green tea infusion samples. The dispersibility of SiO₂@Fe₃O₄ and prevention of its aggregation in the sample solution were improved using the deep eutectic solvent‐based ferrofluid. Also, it facilitated the fast injection of sorbent into the sample solution that led to an increase of the contact surface between the sorbent and analyte, and reduction of the extraction time and consumption of the sorbent. The important experimental parameters influencing the extraction efficiency of morin were examined. Under the optimal conditions, a linear calibration curve was obtained in the range of 3–500 µg/L with a determination coefficient of 0.9994. The limits of detection and quantification were of 0.91 and 2.98 µg/L, respectively. While an extraction recovery of 97.7% with relative standard deviation of 3.8% (interday) was obtained via three replicated measurements on a 30 µg/L of morin standard solution, the enrichment factor was 39.1. Finally, this method was successfully used to extract and preconcentrate morin in various samples, followed with their determination by high‐performance liquid chromatography with ultraviolet detection.