Joe M. Roberts

9 Questions 19 Answers 0 Followers

Questions related from Joe M. Roberts

Base Peak Chromatogram (BPC) Usefulness in GC-MS?

Hello, I am using Agilent MassHunter Qualitative Analysis (B8.0.0) to analyse some GC-MS data and noticed that the BPC gives me a less noisey chromatogram to work with. As I understand it, the...

15 August 2018 9,858 4 View

Are there any Excel lookup functions that return more than one value?

Hi, I'm looking to incorporate a formula into a database I'm building in Excel that returns the identification of a chemical based on it's linear retention index (LRI). Some of these chemicals...

27 April 2018 1,971 2 View

Difference between HP5 and HP5-MS GC columns?

Hi all, I am working on a project that requires the use of a GC-MS coupled to a thermodesorption (TD) unit. The TD unit was attached to the GC last week, but the HP5-MS column that was previously...

08 June 2016 6,964 3 View

Is there an opensource version of Noldus EthoVision?

Hello, I am conducting some behavioural experiments in which I would like to track the movements of two-spotted spider mites, but EthoVision is a little out of my price range. Does anyone know of...

29 January 2016 1,759 8 View

Which is the best solvent to extract insect cuticle chemicals (external)?

Hello, I'm looking for a little advice as to which solvent I should use to extract the chemicals from the surface of some spider mites and what sort of sample size I would require? I have...

22 January 2016 1,118 14 View

How do I quantify volatile organic compounds using GC-MS?

Hello, I am trying to quantify a number of volatile organic compounds I have identified in the headspace of mite infested plants. After some reading, I am under the impression that I will need to...

24 June 2015 1,205 16 View

How can I calculate retention indices for identification of compounds using GC-MS?

Hi! I am looking for a little advice with regards to identifying the compounds I have found in my samples that I have analysed using GC-MS. I understand that I can positively identify compounds by...

04 June 2015 179 25 View

How can I clean glassware for headspace GC-MS analysis?

I am looking for a method suitable for cleaning glassware for GC-MS analysis - any help would be greatly appreciated. Best wishes, Joe

21 April 2015 2,439 9 View

Where can I purchase a Y-tube olfactometer suitable for the use with predatory mites?

I am looking to purchase an olfactometer similar to the one shown in the attached picture. Any help would be greatly appreciated. Thanks!

12 October 2014 3,201 18 View