Muhammad Ayub

5 Questions 9 Answers 0 Followers

Questions related from Muhammad Ayub

Error in Detector calibration in GC-MS/MS?

Hi experts, yesterday I tried to Calibrate/Autotune GC-MS/MS detector, and after sometime it gave error with the message "EDR error, not enough signal". I tried many times but still problem...

22 May 2021 4,968 2 View

What is the EPA/WHO Maximum Residual Limit (MRL) for pesticides in food?

I searched on internet to find out the MRLs values for pesticides in food but not found any authentic data, can anyone please share link or pdf file of EPA/WHO MRLs standard for pesticides in food.

13 November 2020 5,180 8 View

How to resolve base line issue in GC-MS/MS?

In GC-MS/MS pesticide analysis the base line is neither starting from zero nor it is straight even it is fluctuating from peak to peak. Baseline also vary when changing selected ions in SIM scan....

24 September 2020 6,401 4 View

How we can eliminate background signals/noise in GC-MS/MS?

In GC-MS/MS I run the pesticide mix standard (in Acetonitrile) using SIM mode in which sharp well seperated peaks appeared, but there are ups and downs in base line. The same problem comes when...

09 September 2020 4,013 6 View

Is it possible for single analyte to show two peaks at different retention times in GC-MS/MS?

I run full scan for Dimethomorph (a fungicide) in GC-MS/MS, and it gives two peaks with different retention times 11.1 and 11.3. I increased temperature from 280 to 320°C and peaks little bit come...

20 August 2020 3,814 3 View