Amen Ekhosuehi

9 Questions 11 Answers 0 Followers

Questions related from Amen Ekhosuehi

How do I explain a beta value above 1 in Redlich-peterson non-linear Isotherm?

I fitted experimental data to obtain the best suited isotherm using Rstudio and CAVS. Redlich-peterson model was the best fit. However, the softwares generated a beta value above 1(1.99 and 2.44...

19 April 2022 7,441 2 View

How do I quantify the concentration of an analyte using a UV-VIS Spectrophotometer(BK D560)?

I am conducting a batch adsorption test in other to plot the isotherm I chose a concentration range from between 3ppm-100ppm of the initial analyte and I had to plot a calibration curve which...

07 February 2022 4,457 5 View

How to plot isotherm from RSM designed experimental data?

I want to employ the central composite design to optimize 4 parameters with 5 levels. I also would like to fit isotherm/Kinetic models for my batch adsorption experiments Is it possible to plot...

25 August 2021 9,555 1 View

Why are the peak area from batch test increasing instead of reducing as expected?

I performed a batch test to evaluate the removal of a drug using a locally produced adsorbent at pH 3, pH4 , pH5 and pH6. I noticed a reduction in peak areas for pH 3 and 4 But at pH 5 and 6,...

20 March 2021 931 7 View

How do I report below limit of quantification values for pharmaceutical analysis in wastewater?

I conducted an assessment studies on wastewater for the presence of pharmaceuticals and all values after working back to original sample of 1L were below the limit of quantification of the method...

14 March 2021 9,545 5 View

How do I calculate for the concentration in the original sample of 1L after SPE and reconstitution into 2ml?

Please I need the formular to calculate the concentration of analytes in 1L wastewater sample. I used SPE for extraction and reconstituted into 2ml. 100ul was injected from the 2ml into the HPLC...

23 December 2020 5,357 9 View

How do I keep the pH in a batch test constant using a shaker?

I am conducting a batch test with a locally produced adsorbent with a major constituent of Calcium oxide and adsorbate (carbarmazepine, sulfamethoxazole and diclofenac). I want to keep the pH...

19 November 2020 791 6 View

How do I perform recovery studies using the wastewater samples matrix?

I used SPE columns to cleanup 1L sample volume and after eluting and drying , I reconstituted to 2ml using methanol before quantifying with HPLC-DAD? please how do I perform the recovery studies...

29 August 2020 8,353 3 View

How do I perform recovery studies using the wastewater samples matrix?

I used SPE columns to cleanup 1L sample volume and after eluting and drying , I reconstitute to 2ml using methanol before quantifying with HPLC-DAD? I use SPE columns to cleanup 1L sample volume...

29 August 2020 1,352 3 View