Sarika Gupta

13 Questions 22 Answers 0 Followers

Questions related from Sarika Gupta

Can I use heptanoic acid as a standard to quantify n-alkanoic acids in air samples PM10, collected on quartz fiber filter paper?

I am doing analysis of PM10 collected on Quartz fiber filter.I am expecting organic compounds like n-alkanoic acids decanoic acid, dodecanoic acid etc...I have only one standard that is...

03 December 2015 2,799 4 View

How can I calculate analyte conc in ng/m3 when I have made five point calibration curve with standard in ng/ul conc units ?

I have collected ambient air sample on QFF with high volume sampler.A five point calibration curve is made with the standard of varying concs in ng/ul but in many literature analyate conc is...

09 October 2015 2,977 12 View

Can anybody tell how I can interpret the attached results of GC/MS?

I have run some samples on GC/MS and got these results.I am confuse of those peaks with different Retention time and different area but same Name like PENTACOSANE. Now,Please help me to interpret...

14 July 2015 2,801 6 View

Why did my samples get oxidised in my air sample when run on TD GC/MS?

I am collecting samples on Quartz fiber filters n then doing quantification with TD-GC/MS.I got Levoglucosenone,Benzene dicarboxylic acid ,diols,Ketones instead of alkanes.Rather I want to see...

08 June 2015 6,277 11 View

What could be the possible reason of not getting alkanes in result after GC/MS of air samples collected on Quartz filters?

I have collected samples on Quartz fiber filters,ultrasonicated them with DCM & Methanol 2;1,concentrated them with rotary evaporator, filtered through PVDF,spiked with N-alaknes...

20 April 2015 5,065 8 View

Could I use a DB-624 capillary column in GC/MS for the quantification of organic tracers in air, instead of DB-5ms?

I have used a respirable dust sampler for the collection of PM10 on quartz fiber filters and after sampling, extraction with DCM and rota evaporation. Now, for quantification of organic tracers in...

22 January 2015 7,891 5 View

Why pyridine is used with BSFTA+TMCS in derivatization of organic compounds.Could we do this without solvent?

During GC/MS analysis of organic tracers in air,we have to derivatize the polar groups of organic compounds.For this,i have chosen the BSFTA+TMCS reagent.I wanna know that now,should i need a...

19 December 2014 7,254 6 View

Do anyone explain organic compound extraction from quartz filter matrix for GC/MS?

I have done sampling of PM10 in ambient air with the help of respirable dust sampler.Please provide sampling extraction technique for further analysis.

11 December 2014 895 1 View

How could we calculate recovery of an internal standard mixture from GC/MS technique?

I want to calculate recovery and its percentage for an alkane internal standard.

04 September 2014 1,746 8 View

Can anybody suggest literature related to deuterated internal standard method used for analysis in air by GC/MS?

I am doing research on organic compounds, acting as tracers, in ambient air.Please suggest from where i could get compete information.I read many of related articles but procedure and calculations...

04 September 2014 9,872 0 View

How can I calculate the concentration from a gc/ms chromatogram which is having retention time and peak area only?

How can I know the area of ISI? Was used an internal standard which has c20-c 40 alkane standard. How could I found the area of my IS as it is showing many peaks? Secondly, How to calculate conc....

01 August 2014 1,055 41 View

Is a difference between adding internal standard to ambient sample on quartz fibre filter, before and after ultrasonication and rotary evaporation?

Some of researchers add it before extraction of fibre filter and some do it after the extraction. I want to know the correct way of adding IS to ambient air samples for gc/ms analysis.

11 July 2014 2,369 4 View

How do you choose the internal standards for analysis of organic compound classes with GC/MS technique?

I am doing work on organic tracers in ambient air. I want to use a mixture or a single internal standard for all classes (e.g. di carboxylic acid, n-alkanes , polyalcohols, anhydro sugars,...

04 June 2014 937 2 View