Nitrogen nutrition,yield and quality of spinach

When grown in solution culture spinach plants confirmed the preference toward NO₃⁻ nutrition and showed heavy toxicity to NH₄⁺. In open field condition the highest yield was achieved with the ammonium sulphate in Bari (autumn–winter cycle—110 days) and with calcium nitrate in Policoro (winter–spring cycle—64 days). By increasing N level, yield, nitrates and oxalates leaf content increased. Oxalate content was not affected by nitrogen form. Remarkable differences were observed between leaf petiole and blade in nitrate (4062 vs 925 mg kg⁻¹ of fresh mass) and oxalate (1051 vs 6999 mg kg⁻¹ of fresh mass). © 1998 SCI.     

负离子纺织品及其测试进展

介绍了负离子纺织品的加工、对人体健康的作用,论述了负离子纺织品测试研究涉及的仪器类型和研究进展。在总结课题组阶段性工作的基础上,针对目前纺织品负离子性能测试系统和测试方法提出进一步的研究设想。     

含阴离子官能团物质与蒙脱土的相互作用研究

通过研究不同电荷状态的含阴离子官能团物质与蒙脱土(MMT)复合物的插层情况来研究阴离子官能团与MMT的相互作用,利用FT-IR、XRD和NMR等手段对反应产物进行表征,以确定阴离子官能团与MMT的作用机理和作用位点。试验结果表明,羧酸基团与MMT有很强的相互作用。羧酸基团与MMT发生作用的位点是(—COO-)上的羰基(—CO),它与MMT上的(—OH)或Al3+发生作用。     

铁炭微电解法对处理含盐硝基苯废水的实验研究

对不同的盐分在铁炭微电解降解硝基苯过程中的作用机理进行了研究。在铁炭微电解的条件下,以硝基苯为研究对象,选择盐分为参数,在降解过程中,一定时间下取样检测浓度,并计算硝基苯降解率。铜离子、氯离子能促进硝基苯的去除;钙离子对硝基苯的去除率无明显作用;六价铬离子和磷酸根离子对硝基苯的去除有抑制作用;低浓度的硫酸根离子可促进硝基苯的降解,高浓度的硫酸根离子则会减弱对硝基苯降解的促进作用。铁炭微电解过程中盐分对硝基苯的降解率影响很大。     

钙离子对胶磷矿和白云石可浮性的影响研究

以白云石-胶磷矿体系为研究对象, 在无机阴离子存在的条件下, 研究了钙离子对胶磷矿和白云石浮选行为的影响。试验结果表明: F^-存在的条件下, Ca²⁺对两种矿物的可浮性影响并不大; 而CO₃^2-存在的条件下, 在强碱性环境中, Ca²⁺的加入使两种矿物的可浮性趋于一致。同时, 在Ca²⁺体系中, 当pH≈7时, SO₄^2-对胶磷矿的抑制效果较好; 在pH=5~7时, PO₄^3-对两种矿物有明显的选择性抑制作用。F^-和CO₃^2-混合体系中, Ca²⁺对两种矿物的浮选均有一定的活化作用, Ca²⁺对胶磷矿的活化作用要优于白云石。     

Inhibitory effect of tungstate, molybdate and nitrite ions on the carbon steel pitting corrosion in alkaline formation water containing Cl ion

The pitting corrosion of carbon steel in carbonate-formation water solution in the presence of chloride ions and the effect of addition WO₄²⁻, MoO₄²⁻ and NO₂⁻ anions on the pitting corrosion were studied using cyclic voltammetry and potentiostatic current-time measurements and complemented by scan electron microscope (SEM), energy dispersive X-ray (EDX) and X-ray photoelectron spectroscopy (XPS) investigations. Cyclic voltammograms of carbon steel in the presence of chloride ions in carbonate-formation water solution show one anodic peak, corresponding to the formation green rust carbonate and the two cathodic peaks. As the addition of Cl⁻ ions concentration increases, the anodic peak current density increases and pitting potential E_pit shifts to more negative potential. It is shown that the rate of pit initiation () decreases and the pitting potential E_pit moves to more positive direction upon the addition of inorganic anions. It was found that pitting inhibition of carbon steel increases in the sequence: (WO₄)²⁻ > (MoO₄)²⁻ > (NO₂)⁻.     

无熟料硅酸钠矿渣水泥的水化机理

利用三甲基硅烷化方法,借用气相色谱、凝胶渗透色谱测定和比较在高炉矿渣中加入少景硅酸钠或氢氧化钠制成的矿渣水泥在不同水化龄期硅酸根阴离子聚合状态的变化。从其变化规律可知,矿渣水泥在水化过程中有缩聚和解聚两种作用。利用扫描电镜、电子衍射,并结合能谱分析技术对矿渣水泥的水化产物进行了分析和鉴定。对矿渣水泥的结构和硬化过程作了一定的探讨和研究。     

凝结水精处理树脂浸出物研究

通过测定浸出物中微量阴离子、ＴＯＣ、ｐＨ、电导率等,对各类阴阳树脂及其等体积的混合树脂进行了研究,获得了不同树脂的浸出物水平及其随浸泡次数和浸泡时间间隔等的变化规律。试验结果表明,不同生产厂家树脂的浸出物水平差别较大,新树脂的浸出物水平明显低于旧树脂;阴阳树脂均有特征性的浸出物释放,即阳树脂的浸出物主要为无机阴离子,尤以硫酸根为甚,阴离子的浸出物主要为ＴＯＣ,且阴阳树脂分别对另一树脂的浸出物均有良好的相互吸收性。此外,随着浸泡时间间隔的增加,混合树脂的浸出物水平保持不变,阴树脂和阳树脂的浸出物水平明显增加,并由此提出了对凝结水精处理混床实际运行操作具有指导性的建议     

Synthesis, characterization, and catalytic application of copper(I) nitrile cations with perfluorinated weakly coordinating anions

Complexes of the type [Cu(CH₃CN)₄]⁺[A]^– ([A]^– = [B(C₆F₅)₄]^– (1), [B{C₆H₃(CF₃)₂}]^– (2), [(C₆F₅)₃B–C₃H₄N₂–B(C₆F₅)₃]^– (3)) are synthesized and characterized. Their utilization as catalysts in cyclopropanation and aziridination reactions of olefins, forming three membered rings is explored. The compounds are found to catalyze both reactions in moderate to good yields being the best results obtained with compound 1. The more weakly the nitrile ligands are coordinated to the metal center, the better is the catalytic performance of the catalyst.     

Removal of Dichromate Anions with Nanofiltration‐Complexation by using Amino Calix[4]arene Derivative

Abstract

Herein the removal and recovery of chromium anions from aqueous solutions by using nanofiltration pilot‐scale equipment (Osmonics Sepa CF Membrane Cell) with a water‐soluble amino calix[4]arene derivative was studied. To understand the selectivity, the authors also examined the retention of chromium anions in the presence of Cl^?, NO₃ ^?, SO₄ ^2?, HSO₄ ^?, CO₃ ^2?, PO₄ ^3?, H₂PO₄ ^? anions in nanofiltration‐complexation. From the results water‐soluble amino calix[4]arene was effective and selective ligand for dichromate anions over nitrate anions, in a nanofiltration‐complexation system at pH 2.5. Moreover, the recovery and reusability studies of dichromate and nitrate anions and also ligand were performed.