Senthamizh Selvan

18 Questions 145 Answers 0 Followers

Questions related from Senthamizh Selvan

What is the cell used in volumetric karl fischer titrimetry?

Galvanic Cell or electrolytic cell ? What is the detection technique?

09 September 2012 4,205 2 View

How to prepare and increase yield for acetal synthesis?

I am mixing some chemicals along with propylene glycol with some aldehydes, in some instances there is a formation of acetal but other times not. Does anybody know the thermodynamics & kinetics...

08 August 2012 5,926 2 View

How to prepare sample & analyze a volatile content in beverages?

I need to compare two products of same brand by GC / GCMS, i have tried to extract the volatile part of the aqueous beverage by using CH2Cl2, pentane:diethyl ether; but the volatile are very less....

10 October 2011 2,123 6 View

Which is the precise ionization and %area is close to absolute % between MS ionization (GCMS) and FID ionization (GCFID)? Why?

Are the % area of TIC of GCMS and FID comparable? if not why? What is detector linearity? i worked with absolute % (Pharma) of sample composition and also % area composition (in CRO, Synthetic...

10 October 2011 7,694 3 View

It is better to be roughly right than precisely wrong. —John Maynard Keynes

It is better to be roughly right than precisely wrong. —John Maynard Keynes You all have probably heard the story about Malcolm Forbes, who once got lost floating for miles in one of his...

09 September 2011 2,513 2 View

Is the sentence "Break the Rule" related to innovation?

Please share your opinion / comments / ideas / suggestion how could an young scientist think? how extend he could follow the old rules? how can i get recognition? Thanks Selvan

09 September 2011 2,933 0 View

Any body using super critical fluid extraction for analytical sample preparation?

Please tell me the Make/Model of super critical fluid extraction apparatus which can be used for analytical sample preparation. Thanks

09 September 2011 1,304 1 View

What kind of natural extracts will have lots of aliphatic alkanes and amines?

I have analysed a product-unkown by GCMS which is having lots of aliphatic alkanes and amines such asNonadecane Heptane, 2,4-dimethyl- Decane, 2,6,6-trimethyl- Decane,...

09 September 2011 6,407 4 View

Anybody knows about SCF Extraction which can be used for sample preparation of consumer products?

I need to extract volatile materials from consumer products such as detergent, soaps and other perfumery products. usually the fragrance materials will be about 0.5 to 1.0 % in the consumer...

09 September 2011 5,844 1 View

Anybody using gamma spectrometer?

What is the use of it.

09 September 2011 6,506 1 View

What is the difference of % area of Area Normalization between TIC of GCMS and FID?

TIC - GCMS and FID Chromatogram; Which is the best way to quantify the ingredients in the area normalization method? why? Thanks

09 September 2011 4,343 5 View

Anybody know what is polyimide resin?

Polyimide resin used for fix press-fit with Gc capillary column and how could i use effectively

09 September 2011 1,238 1 View

Anybody using "Y" Splitter for GCMS?

I am using 'Y' splitter for our GCMS, it connected tat column outlet and one part is going to MS and another is going to FID; i have a sensitivity problem in FID and RT differences ( TIC-MS is...

09 September 2011 4,668 7 View

What is the right scan range-molecular weight in MS-GC/ GCMS?

I am using 4.5 grade Helium as carrier gas, it gives an intense 32 m/z peak for oxygen, I set the scan range 33-550 m/z to avoid peak at 32 m/z and increase S/N ratio ( i got the 2-3 fold of...

09 September 2011 1,237 7 View

What are retention indices in GC, GCMS?

09 September 2011 3,517 11 View

Is it possible to utilize an old Gas chromatograph “HP 5890 with auto sampler" effectively?

It is having GPIB Communication; old data acquisition software-HP Chemsation. data analysis is not so good. Sensitivity of the instrument is in question. How could I utilize the instrument...

09 September 2011 1,302 1 View

Anybody knows about automated volatile oil determination methods?

We have a classical method of analysis to determine volatile oil in the natural products. It is time consuming- taking 4 hours. How can I improve the tech? Many thanks

09 September 2011 1,819 2 View

Is anybody using Achiever Plus - document management software? can anybody suggest some free document management software?

I need manage my documents like protocol, reports, SOP, STP, Spreed sheets etc. please help me on this. Many thanks

08 August 2011 9,796 0 View