Research on Raman Spectral Characteristics and Mechanism of Ammonium Sulfate Solution

2014 ◽  
Vol 34 (3) ◽  
pp. 0330004
Author(s):  
孙松 Sun Song ◽  
蔡廷栋 Cai Tingdong ◽  
刘莹 Liu Ying ◽  
王静静 Wang Jingjing ◽  
叶勇 Ye Yong ◽  
...  
2017 ◽  
Vol 169 ◽  
pp. 534-541 ◽  
Author(s):  
Kun Yang ◽  
Libo Zhang ◽  
Chao Lv ◽  
Jinhui Peng ◽  
Shiwei Li ◽  
...  

1980 ◽  
Vol 26 (2) ◽  
pp. 277-281
Author(s):  
M Mitnick ◽  
B DeMarco ◽  
J M Gibbons

Abstract We describe a stepwise-development thin-layer-chromatographic technique for separating phosphatidylglycerol and phosphatidylinositol in samples of amniotic fluid. Plates are prepared from silica gel G slurried in a 50 g/L ammonium sulfate solution. Phospholipid phosphorus determination is not needed. Phospholipid phosphorus determination is not needed. Phosphatidylglycerol and phosphatidylinositol, measured densitometrically, are expressed as ratios to the sphingomyelin present. These ratios are correlated with the lecithin/sphingomyelin ratio and age of gestation in normal and abnormal pregnancies.


Polymers ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 343 ◽  
Author(s):  
Dong Wang ◽  
Wenqiao Meng ◽  
Yunna Lei ◽  
Chunxu Li ◽  
Jiaji Cheng ◽  
...  

To improve sulfuric acid recovery from sodium sulfate wastewater, a lab-scale bipolar membrane electrodialysis (BMED) process was used for the treatment of simulated sodium sulfate wastewater. In order to increase the concentration of sulfuric acid (H2SO4) generated during the process, a certain concentration of ammonium sulfate solution was added into the feed compartment. To study the influencing factors of sulfuric acid yield, we prepared different concentrations of ammonium sulfate solution, different feed solution volumes, and different membrane configurations in this experiment. As it can be seen from the results, when adding 8% (NH4)2SO4 into 15% Na2SO4 under the experimental conditions where the current density was 50 mA/cm2, the concentration of H2SO4 increased from 0.89 to 1.215 mol/L, and the current efficiency and energy consumption could be up to 60.12% and 2.59 kWh/kg, respectively. Furthermore, with the increase of the volume of the feed compartment, the concentration of H2SO4 also increased. At the same time, the configuration also affects the final concentration of the sulfuric acid; in the BP-A-C-BP (“BP” means bipolar membrane, “A” means anion exchange membrane, and “C” means cation exchange membrane; “BP-A-C-BP” means that two bipolar membranes, an anion exchange membrane, and a cation exchange membrane are alternately arranged to form a repeating unit of the membrane stack) configuration, a higher H2SO4 concentration was generated and less energy was consumed. The results show that the addition of the double conjugate salt is an effective method to increase the concentration of acid produced in the BMED process.


1967 ◽  
Vol 13 (5) ◽  
pp. 423-425
Author(s):  
H Bruce Collier

Abstract The Gilford Absorbance Indicator was recalibrated, for absolute absorbance readings, with (1) a U. S. Bureau of Standards calibrated cobalt-blue glass standard; (2) a standard cobalt ammonium sulfate solution at 512 mµ (3) standard potassium chromate solutions at 373 mµ These three standards agreed with 1%. Readings on the indicator's absorbance scale had decreased by about 7% over 2 years.


2018 ◽  
Vol 69 (11) ◽  
pp. 1597-1608 ◽  
Author(s):  
Kun Li ◽  
Zhuoyuan Chen ◽  
Jiarun Li ◽  
Xiaoying Sun ◽  
Fengling Xu ◽  
...  

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