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NikosE.Mazonakis PanagiotaH.Karathanassi DimitriosP.PanagiOtOpOulos ParaskeviG.Hamosfakidi DimitriosA.Melissos 《中国洗涤用品工业》2013,(9):55-58
采用合适的定量分析技术(高效液相色谱法,液相色谱),运用常规清洗程序对化妆品生产设备(制备和贮存罐,灌装喷嘴和用具)进行清洗。 相似文献
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建立了高效液相色谱法测定三(3-羟丙基)膦反应液中催化剂V601的方法,采用Shim—PackVp—ODS050mm×4.6mm)色谱柱。紫外检测器。在优化的条件下,外标法进行定量分析。结果,用高效液相色谱法测定三(3-羟丙基)膦反应液中催化剂V601的最佳条件为:Shim—packVp—ODS(150mm×4.6mm)色谱柱,流动相为乙腈/水(v/v=8:2),紫外检测波长为200nm,流速为1.0mL·min-1。结论:该方法具有简便、快速、准确、灵敏度高、重现性好的特点。 相似文献
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在以对氯苯乙酮单缩二氨基硫脲(HL)为配体的非水溶剂中,用Ti、Ni、Cu金属做阳极,用电化学金属阳极氧化法合成了对氯苯乙酮单缩二氨基硫脲与Ti(Ⅳ)、Ni(Ⅱ)、Cu(Ⅰ)的金属配合物。通过元素分析、红外光谱、紫外光谱、磁化率、摩尔电导等对配体和配合物进行了表征。 相似文献
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提出了顶空-气相色谱法测定纸类印刷品中16种挥发性有机物(VOCs)的方法。选用三醋酸甘油酯为溶剂,对平衡时间及平衡温度进行优化。结果表明,本方法测定16种挥发性有机物的线性范围为0~100mg/m2,最低定量限为(10S/N)为0.005mg/m2,回收率为94.79%~101.77%,样品6次重复测定的峰面积的相对标准偏差小于5%。 相似文献
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根据反应原料的不同,介绍了3,5-二甲基苯胺的六种主要合成方法,阐述了不同的合成方法得到的不同结果,比较了各种方法的可行性。其中3,5-二甲基苯酚法和2,4-二甲基苯酚法在工业生产中应用最广。前者因为原料价廉易得,且反应一步完成,副反应较少,最受研究者关注;后者芳伯胺法是最新研究的合成方法。 相似文献
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离心泵故障诊断方法的研究综述 总被引:1,自引:0,他引:1
主要介绍了目前离心泵故障诊断的几种方法,并对这几种方法的优缺点进行了比较,举出了一些诊断方法的应用实例进行了分析,对未来离心泵故障诊断方法进行了展望。 相似文献
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结合无机及分析化学课程的内容和特点,介绍了无机及分析化学课程教学改革的一些新举措,取得了良好的效果。主要研究内容和成果有:优化教学内容,选择合适的教材,合理安排教学进度;改进课堂教学方法和手段,将传统教学方式与多媒体教学相结合;理论与实验教学相结合,加深学生对理论知识的理解,培养学生的研究能力和创新意识。 相似文献
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综述了有机硅改性丙烯酸酯乳液的最新方法。重点介绍了化学改性法,并且主要对缩聚法、自由基聚合法、硅氢加成法和IPNs(互穿聚合物网络)法的机制进行了介绍。最后分析了有机硅改性丙烯酸酯乳液存在的问题,并展望了其未来的发展方向及发展前景。 相似文献
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电镀污泥中含有多种重金属,对电镀污泥中的重金属采用湿法回收的方法进行了综述,重点介绍了酸浸法、氨浸法、焙烧法、萃取法、沉淀法、还原法及电解法回收重金属的研究进展,对各方法的优缺点进行了简单分析,并对其今后的发展趋势作了展望。 相似文献
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C A Dárdano 《Archivos latinoamericanos de nutrición》1987,37(1):55-65
A total of 83 diets served over a period of 20 days to hospitalized diabetic patients were studied. The diets were modified in both calories and carbohydrates and were prepared in a centralized cooking facility. The diets studied were randomly selected, without replacement, using a random number table. Quantities of food served were determined using the direct weighing method. The nutritional value of the diets was determined by three indirect methods. The first, the detailed method, using energy and nutrient values of individual foods, and two abbreviated methods, I and II, based on the reference food values and food group mean values. Calories, proteins, carbohydrate, calcium, phosphorus, iron, retinol, and thiamine, riboflavin, niacin, and ascorbic acid contents were calculated for each diet. Furthermore, for each of the energy and nutrient calculations, the mean, standard deviation and variance were determined for all diets. A correlation and linear regression study was performed, to establish differences between the detailed and the abbreviated methods. Also, Student's "t" test of equality of means was used to identify differences in the calculation of the nutrient content of the diets. Significant differences among the values obtained by the three methods were found. In relation to the values obtained by the abbreviated methods, significant differences were found only for calcium and thiamine. In general, however, the diet calculation using the abbreviated methods gave similar results as those obtained by using the detailed method. Therefore, the use of the abbreviated methods at hospital level is considered convenient because they considerably reduce work, time and costs of diet planning and evaluation, making them easier. Nevertheless, their limitations should be taken into account. The preceding results document substantial problems in the use of the two abbreviated methods studied. The differences observed between the detailed and abbreviated methods in mean levels of most nutrients are unacceptably large, suggesting that the abbreviated methods suffer biases in estimating the nutrient content in the hospital diets studied. These problems are particularly important for the diabetic patients who composed the sample, in that dietary energy, fat, and carbohydrates were over-estimated in a consistent manner by both abbreviated methods used. Nonetheless, abbreviated methods, such as those used in the present study, have advantages which cannot be ignored: they are easy to use, reducing time requirement, and conceptual simplicity.(ABSTRACT TRUNCATED AT 400 WORDS) 相似文献
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