二苯碳酰二肼柠檬酸盐光度法快速测定水中铬(Ⅵ)

合成了一种二苯碳酰二肼柠檬酸盐,建立了基于这种试剂和手持式光度计的铬(Ⅵ)的快速现场测定方法.在弱酸性介质中,此试剂与铬(Ⅵ)形成紫红色产物,λ_max=540nm,摩尔吸光系数ε=3.32×10⁴L·mol^-1·cm^-1,铬(Ⅵ)含量在0.03～2.00mg/L内符合比尔定律.该法用于电镀废水中铬(Ⅵ)的快速测定,结果令人满意.     

高效液相色谱法测定枸橼酸他莫昔芬片的含量

An RP-HPLC method for the quantitative determination of contents of tamoxifeni citrate tablets was devel-oped.The operating conditions are as follows:CN column,250mm×4.6mm;mobile phase:mixture of methanol-water-glacial acetic acid-sodium heptyl sulfonate(340:160:1: 0.5);internal standard,trimethoprim;detectionwaveiength,254nm;and flow rate,0.6mL/min,Coefficient of variaion was1.1%,This method is simple and re-liable.     

光度法测定枸橼酸西地那非及尿中西地那非的含量

枸橼酸西地那非(Sildenafil citrate)商品名为万艾可(Viagra),是治疗男性性功能障碍药。目前测定西地那非含量的方法主要是HPLC,操作繁琐,仪器昂贵。本文在pH2．5-4．7的酸性介质中,发现乙基曙红(EE)与西地那非(SD)反应后,生成红色离子缔合物,其最大显色波长和最大褪色波长分别为550nm和520nm,表观摩尔吸光     

Study on Infrared Transmission Spectrum of Sildenafil Citrate Mixed in Traditional Chinese Medicine

The infrared transmission spectrum has been studied on the mixed medicine sample composed of sildenafil citrate (SDF or Viagra) and traditional Chinese medicine(TCM). The measured infrared spectra are composed of several broad absorption bands and many sharp absorption lines. Then the broad absorption bands are changed from sample to sample. It is identified that the sharp and broad absorption bands are from the Viagra and TCM, respectively. A numerical best fitting process has been used to extract the absorption spectrum from the spectrum of mixed sample. Combined with the numerical analysis, the Viagra component can be extracted from the mixed material even with a changeable broad absorption bands' background. It shows that the infrared transmission spectroscopy is a useful method to extract the component of chemical medicine from the mixed medicine.     

Influence of γ-irradiation on the kinetics of heat release during the interaction of an aqueous solution of HNO3 with aliphatic hydrocarbons

The influence of preliminary γ-irradiation and γ-irradiation during hte oxidation process on the kinetics of heat release in the systemsn-decane—aqueous solution of HNO₃ and a solution of tributyl phosphate in a kerosene—aqueous solution of HNO₃ was studied. The preliminary γ-irradiation of the system at 43°C increases the initial rate of the process (k ₁). The increase is proportional to the irradiation dose at doses up to 150kGy, then the increase ink ₁ is retarded, and the further course of the process becomes practically independent of the irradiation dose. The effect of γ-irradiation during the oxidation depends on the temperature of the system: at temperatures lower than 80 °C, γ-irradiation increases the rate of heat release, whereas at higher temperatures, γ-irradiation decreases the rate of heat release. The effects observed were explained by the competition of NO₂ accumulation due to the radiolysis of nitric acid and processes of the addition of NO₂ to unsaturated hydrocarbons produced by the radiolysis of the organic phase. Translated fromIzvestiya Akademii Nauk, Seriya Khimicheskaya, No. 6, pp. 1116–1120, June, 1998.     

磷酸三丁酯-煤油-硝酸铀酰体系的等离子体光谱研究

研究了磷酸三丁酯-煤油试样的等离子体光谱的发射特性，测试了C2、CN、Ar、N2、OH、NH、U、Ca等分子和原子的发射强度的垂直分布，讨论了氰带抑制问题，增加Ar等离子体气的流量有助于降低氰带强度，元素分析线的强度则不发生明显变化。讨论了有机标准溶液的制备问题。     

室温快速合成SnSe纳米棒

The synthesis of crystalline SnSe nanorods was successfully achieved via a chemical reaction between sodium selenosulfate (Na₂SeSO₃) and SnCl₂·2H₂O in alkaline aqueous solution in the presence of the complexing agent (trisodium citrate) at room temperature under ambient air. The product was characterized by X-ray diffraction (XRD), transmission electron microscopoy (TEM) and X-ray photoelectron spectroscopy (XPS). The results reveal that the SnSe nanorods are well crystalline with an average diameter of 85 nm and the lengths up to 10 μm. The possible mechanism for the formation of SnSe is also discussed.     

壳聚糖硫酸盐催化合成柠檬酸三丁酯

柠檬酸三丁酯(简称TBC)是一种无毒高效的优质增塑剂,它具有相容性好、增塑效率高、无毒、挥发性小且耐寒性、耐光性、耐水性好等优点,已被美国食品与药品管理局(FDA)认为是最安全的增塑剂之一。本文以柠檬酸、正丁醇为原料,自制的壳聚糖硫酸盐为催化剂合成柠檬酸三丁酯。探讨了酸醇的物质的量比、催化剂用量、反应时间、反应温度等因素对反应的影响。实验表明,当酸醇的物质的量比为1∶10、催化剂为柠檬酸用量21 4%、反应时间为8h、反应温度为120℃时,酯化率可达97 26%,并且催化剂可重复使用多次。1　实验部分1 1　试剂与仪器WAY 1S…     

新原料路线共沉淀法组装超分子结构柠檬酸根插层水滑石

以Mg(OH)₂和NaAlO₂为原料，采用新原料路线共沉淀法实现了柠檬酸根插层结构LDHs的超分子组装。用XRD、FT-IR、TG-DTA和元素分析等手段对样品进行分析表征。结果表明，新原料路线共沉淀法较常用的共沉淀法得到的柠檬酸根插层LDHs结晶度高、晶相单一，客体柠檬酸根在LDHs层间的排列高度有序。