排序方式: 共有34条查询结果,搜索用时 15 毫秒
11.
12.
13.
本文研究了三元体系MgSo4-CH3CONHCONH2-H2O(I)和Mg(NO3)2-CH3CONHCONH2-H2O(Ⅱ)在30℃的相平衡,测定了饱和溶液溶解及其折光指数,绘制了相应了溶度力和折光指数一组成关系图。两个体系为简单截饱型。溶度曲线及折光指数曲线均由两支组成,分别与MgSO4.7H2O(I)或Mg(NO2)2.6H2O和CH2CONHCONH2相对应。共饱点的组成分别为(I)中Mg 相似文献
14.
15.
一株耐受高浓度硫酸镁单细胞绿藻的分类学鉴定及单盐胁迫对其生长的影响 总被引:1,自引:0,他引:1
在75g/L浓度的硫酸镁溶液中发现了一株生长良好的单细胞绿藻。为了解这株特殊微藻的系统进化学分类地位和潜在利用价值,本文结合了分子系统学方法和形态特征,并测定其不同盐环境下的光合效率,以探讨其对于硫酸镁盐的耐受机理。结果表明,基于该藻株18S及ITS r DNA序列构建的系统进化树确认其隶属于胶球藻属。该株藻细胞为椭圆形、具有较小的长宽比、色素体多为分叶的2瓣和无明显胶被等特征与胶球形胶球藻较接近,系统发育分析显示其与伪胶球藻株系和与地衣Peltigerales共生株系亲缘关系较近。对该藻不同培养条件下的耐受特征做出初步探索,结果表明其对硫酸镁有着独特的单盐抗性,并可以耐受蒸馏水环境。这些特性表明该藻株有良好的抗杂藻污染特性,具有潜在应用前景。 相似文献
16.
17.
18.
GUO Lugang) )) WANG Haizeng) * ) Key Laboratory of Marine Chemistry Theory Technology Ministry of Education Ocean University of China Qingdao P. R. China ) Institute of Automation of the Chinese Academy of Sciences Beijing P. R. China ) Beijing Municipal Institute of Science Technology Information Beijing P. R. China 《中国海洋大学学报(英文版)》2009,8(3):229-232
A magnesia adsorbent was prepared from straw pulp black liquor and magnesium sulfate for the first time, and its adsorption
of phenol from aqueous solution was examined. The characteristics of the adsorbent were tested through chemical analysis,
surface analysis, X-ray diffraction and FT-IR spectroscopy. The effects of various factors, such as dose, adsorption time
and adsorption temperature, on phenol adsorption behavior were studied. The results show that the adsorption processes can
be fitted to the isotherm Langmuir model very well. It was found that the adsorption process was strongly influenced by temperature
and the optimal temperature for phenol removal was 40 °C. The optimum adsorption time was 10 min, and desorption would happen
afterwards. Between the models of Langmuir and Freundlich, the adsorption process of phenol onto magnesia fitted the Langmuir
equation better. 相似文献
19.
以硫酸镁和氨气为原料,直接制备高浓度阻燃剂氢氧化镁。通过单因素实验确定了最佳工艺条件,搅拌强度450r/rain,氨镁摩尔比2.4:1,氨气加入流量500mL/min,陈化时间60min,反应温度60℃,硫酸镁浓度2.50mol/L。用扫描电镜、X射线衍射仪和激光粒度仪表征产品的形貌、结构及粒度。在最佳工艺条件下得到,D5012.06μm,D90 18.99μm,料浆浓度7.37%,Mg收率68.02%,氢氧化镁纯度96.75%。 相似文献
20.