钯钌合金中钌的测定

研究了钯钌合金中钌的测定方法。在强酸性溶液中（CHCl=5．0mol／L）和在有乙醇作稳定剂时,钌（Ⅲ）可与硫脲形成稳定的蓝绿色配合物;在最大吸收波长（λmax=620nm）处测定,50μg／50ml～250μg／50ml的钌（Ⅲ）符合比尔定律。大量的钯不干扰钌的测定。对钌含量为0．5％的钯钌合金8次测定,相对标准偏差为51％,加料回收率为95％～104％。该方法可用于含钌0．5％～2．5％的钯钌合金中钌的准确测定。     

Studies of syntheses and adsorption properties of chelating resin from thiourea and formaldehyde

Chelating resins are useful substances in industry because of their extraordinary adsorption properties for specific metal ions. In this study, a new type of chelating resin is synthesized simply by reaction between thiourea and formaldehyde. The synthetic conditions and the structure of the product are approached and the adsorbing capacities for 11 metal ions, adsorbing rates, and selectivities investigated. The results of the experiments show that the resin has high adsorbing capacities for Ag(I): 13.1 mmol/g, and for Au(III): 6.95 mmol/g. Adsorbing rates are close to 100% in dilute solution. Isothermal adsorbing study reveals that the adsorption is monomolecular layer adsorption process. It is hopeful for the resin to be used for concentrating and retrieving Ag(I) and Au(III) ions from their dilute solutions in industry. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 82: 3127–3132, 2001     

硫脲衍生物的合成和生物活性研究

为了寻找新的更为优秀的杀菌剂品种,选用取代含氮杂环取代嘧啶与烷氧羰基异硫氰酸酯反应,合成了21个硫脲衍生物4-取代嘧啶基硫代脲酸酯类化合物,其中19个化合物为新化合物。结构组成经元素分析、IR及1H NMR确认,并测定了其中5种植物病菌的室内毒力作用,结果表明:大部分化合物具有良好的抑菌和杀菌活性。这些参数为新的硫脲类化合物的合成和筛选提供了依据。     

对称性硫脲的绿色合成工艺

以乙二胺、二硫化碳为原料,在水中“一锅法”合成亚乙基硫脲（ETU）,收率达到99%以上,纯度达到99%以上。利用NMR、FTIR对产物结构进行了确证。考察了二硫化碳滴加温度、乙二胺与二硫化碳物质的量比、回流反应温度、回流反应升温速率及氢氧化钠反应段氢氧化钠的用量对亚乙基硫脲收率、纯度的影响。结果表明：最佳合成工艺条件是,二硫化碳滴加温度为30 ℃;n(乙二胺)∶n(CS2)=1∶1.2;回流反应温度为65~70 ℃,回流反应升温速率0.17 ℃/min;氢氧化钠反应段氢氧化钠的用量为乙二胺质量的3.0%。以此合成方法为模板,又合成了1,3-二乙基硫脲（DETU）和四氢-2（1H）-嘧啶硫酮（PUR）,经中试验证表明,工艺稳定可靠,产品收率、纯度均达到99%以上,母液可循环套用。     

化学镀镍的渗氢测量

介绍了一种适用于化学镀镍工艺的渗氢测量方法，可用于监控渗氢速度，测定氢在金属中的扩散，研究氢脆，评估腐蚀阻化剂和酸洗中钢铁的吸氢等方面。化学镀应用中经常要使用加速剂，本研究的目标物质是化学镀镍的加速荆——硫脲及其衍生物。在这些物质存在下，化学镀镍过程中的渗氢行为不同。良好的加速剂可减少氢渗，加快金属的覆盖。     

某硫铁矿烧渣的硫脲法浸金银研究

针对某硫铁矿烧渣进行了硫脲法搅拌浸金、银研究,考察了磨矿细度、硫脲浓度、pH值、液固比、搅拌时间、矿浆温度、浸出剂种类对金、银浸出率的影响。结果表明,适宜的搅拌浸出条件为: 磨矿细度-0.074 mm粒级占89%、硫脲浓度15 g/L、pH=2.5、液固比3、搅拌时间7.5 h、矿浆温度50 ℃,此条件下金、银浸出率分别达到84.8%、72.1%。     

Degradation of the nitrification inhibitor 1-amidino-2-thiourea in soils,and its action in Nitrosomonas pure culture and soil incubation experiments

The degradation of guanylthiourea (GTU) via 3,5-diamino-1,2,4-thiadiazole (TDZ) to dicyandiamide (DCD) was studied in selected soils. All three compounds could be determined by HPLC. GTU decomposed rapidly (within hours-days), the reaction from TDZ to DCD continued more slowly (within days-weeks). Soil type and temperature had an essential effect on the rate of degradation; conspicuous was a more rapid breakdown of GTU in presence of ammonium sulfate (AS) than in combination with urea.Each compound is a nitrification inhibitor; inNitrosomonas cell suspensions, 0.5 ppm GTU and 10 ppm TDZ achieved an effect comparable to 200 ppm DCD.The combination of these two effects—degradation in soil and inhibition of nitrification—were studied in soil incubation experiments. The three substances had inhibitory effects also in soil, however at significantly different application rates (20 ppm GTU or TDZ and 30 ppm DCD). Using these concentrations, AS/DCD and urea/GTU showed similar effects.Urea/GTU retarded nitrification by the factor 1.7 as compared to urea/DCD. AS/GTU had no advantage over AS/DCD which can be explained by the more rapid degradation of GTU in presence of AS.Urea/GTU apparently presents a promising possibility to utilize N-fertilizers more efficiently.     

1,2,4-三氮唑酰基硫脲的合成及生物活性

采用亚结构连结法设计合成了6种未见文献报道的标题化合物，它们的结构经元素分析、IR、，^1HNMR和MS确证，并进行了初步的生物活性测试，结果表明部分化合物具有良好的植物生长调节活性或除草性。     

Dissolution theory of gold in alkaline thiourea solution(

The oxidants of gold were investigated in an alkaline thiourea solution containing Na₂CO₃, in which Na₂S₂O₈ is a proper oxidant for dissolving gold because of in such homogeneous sulfur system coexisting complex agent, oxidant and stabilizing agent. The thermodynamic analyses were conducted on the dissolving of gold in the alkaline thiourea solution containing Na₂SO₃ by the oxidants oxygen or Na₂S₂O₈. The results show that the possibility of gold dissolution reduces with increasing pH value, while oxygen acts as oxidant; and when Na₂S₂O₈ acts as the oxidant of gold in the alkaline thiourea solution of pH 12.5, decomposition potential of thiourea decreases from the standard value 0.42 V to -0.32 V, also the dissolution trend of gold enhances with shifting the mix potential of the solution to the positive direction.     

Dissolution theory of gold in alkaline thiourea solution(Ⅲ) ——Thermodynamics on dissolution of gold in alkaline thiourea solution containing Na _2SO_3

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