Dileep Singh

9 Questions 24 Answers 0 Followers

Questions related from Dileep Singh

Disappearing peaks in LC-MS ?

I am working on developing a method for analyzing about 28 PPCPs. Calibration, SPE recovery, and all necessary validations were completed. However, I recently encountered an issue where the peaks...

10 January 2025 1,777 19 View

Should I do normality test before two way ANOVA ?

I have performed adsorption isotherm tests with 4 adsorbents (Pristine Biochar and three modified Biochar) at two different temperatures., The Freundlich model fitted the best so I want to see...

28 December 2024 9,272 4 View

What could be the reason for very poor recovery of triclosan?

I'm working on the method development for the analysis of various PPCPs and emerging contaminants in aquatic environments, currently focusing on SPE recovery by spiking compounds in Milli-Q water....

30 October 2024 3,007 7 View

Can I change flow rate during gradient?

I’m using gradient elution on an LC-MS (Waters 2695) for PPCP separation and analysis. Currently, with my column volume and flow rate, I allow 12-13 minutes for re-equilibration between...

28 October 2024 8,163 4 View

What could be the reason for peak shifting after Solid phase extraction?

I spiked DI water with Diclofenac to check its recovery using four different SPE methods, each with varying pH and eluent combinations. However, I noticed a consistent shift in retention time as...

23 September 2024 1,899 16 View

How to prepare Orthovanadate solutions adjusted to pH 7.5?

I need to conduct adsorption studies on Vanadium using Biochars, nanoxides and some other soil amendments . To prepare Vanadium solutions up to 320 ppm with a pH buffered at 7.5 using PIPES...

09 July 2024 2,561 2 View

How should I prepare the standards for analysis of chromium in AAS? Should I use my background electrolyte or water?

I have conducted experiments to study specific adsorption of chromium in various soils and I made my all solutions of cr with using 0.01M NaNO3 as background electrolyte. (I made solutions of 5...

11 June 2023 9,645 2 View

Why background electrolytes are used while performing adsorption experiments?

I am performing batch experiments to study specific adsorption of heavy metals in soil. For that why do I need to add any background electrolyte in that. I mean I have searched but the description...

03 June 2023 1,706 3 View

Please see the description. How to convert this ppb to mg/kg of soil?

I digested 0.25gm of my soil sample and then made final volume to 50ml using di water. Then I further diluted this by taking 7.5ml of this and made volume to 15ml. I got 10.5ppb as reading in...

02 June 2023 9,017 6 View