P. Abraham

5 Questions 3 Answers 0 Followers

Questions related from P. Abraham

Does the concentration of a sample affect the absorbance measurement in the visible region?

The two plots in the attached figures illustrate spectra for copper-polyethylenimine (Cu-PEI) and copper-polyacrylic acid (Cu-PA2) complexes. In the spectrum for Cu+1.7 ppm PEI (first plot) there...

11 July 2020 8,465 3 View

How can the formation of "pores" be eliminated from a dense membrane?

The dense membranes in question are cast by phase inversion, using THF as a solvent. The goal of course is to obtain a dense polymeric membrane. However, some "pores" are formed. This could be due...

24 October 2019 8,496 3 View

What would be the rate of NH3 volatization from NH4Cl solution (pH = 11)?

The pH of the ammonium chloride solution was raised to 11 by adding caustic. Based on the NH3 gas probe reading, the concentration of NH3 in NH4Cl, placed in a fume hood, dropped by 30%, within 10...

28 April 2018 6,281 1 View

What could be the reason for the appearance of an inverted doublet at 2360 cm-1?

FTIR spectra were generated for 0.1 M H2SO4 and 0.1 M H2SO4 which had a soaked polymeric membrane. At first, I thought the spectrum of the latter was a mirror image of the former, but that's not...

13 April 2018 4,732 8 View

What is the procedure for determination of Total Ammonia Nitrogen (TAN) in wastewater streams and ammonium hydroxide solution?

Especially in a continuous flow mode, for TAN concentration of up to 4000ppm.

26 October 2016 6,977 4 View