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ESTD VS ISTD
Posted: Fri Jun 10, 2011 2:23 pm
by amrnasser87
dear all
iam using ESTD as my basic calculaion but i want to try ISTD in my GC for hydrocarbon analysis
any one could help me to know the advantages and disadvantages of both?
regard
Amr
Re: ESTD VS ISTD
Posted: Fri Jun 10, 2011 3:56 pm
by GasMan
Amr,
You do not say if your samples are gas samples or liquid samples. If you are doing gas analysis with a gas sampling valve it is extremely difficult to add an internal standard to a gas mixure, so you are limited to external standard calculation or normalization.
Gasman
Re: ESTD VS ISTD
Posted: Fri Jun 10, 2011 4:07 pm
by amrnasser87
Amr,
You do not say if your samples are gas samples or liquid samples. If you are doing gas analysis with a gas sampling valve it is extremely difficult to add an internal standard to a gas mixure, so you are limited to external standard calculation or normalization.
Gasman
i am using gas sample