1.What is the difference between method validation and method verification 2.Which guidelines proposed to method transfer348
My question about gas chromatography sulfur chemiluminsecence detector. I test unknown sample gas by GC-SCD (calibrated ) and the result of *H2S is 279 PPM , *but when I test the same sample with the GC-TCD (calibrated ) the value of *H2S is 2500 PPM . I'd like to inform you that both GCs are calibrated and have very good operation conditions with stable parameters . the question is if the sample gas with higher H2S over detection limits of SCD detector (1000 ppm). why the result it 279 ppm Best regards304
What is difference between known and unknown impurities252
What is the difference between known and unknown impurities?1 559
Why to use propyl paraben in HPLC gradient calibration1069
Why potassium dichromate was using in Uv calibration?1 792
%lod always grater than %water content for same product??1 507
We use Potassium Dichromate solution for the calibration of UV-Visible Spectrophotometer in UV region. My question is to calibrate visible region which solution could be used in photometric accuracy336
How to define samples weight in moisture content1 340
what is peak purity and its formula
For standardization of volumetric solutions, acceptance limit for concentration is considered as 10% of nominal concentration and %RSD as NMT 0.2% (for appropriate no. of replicates). But , if %RSD has not met, what should be further action?
Qc interview questions
How can we confirm the HPLC column is end-capped or not? Is it possible to identify by physical appearance?
What is the difference between purge septum flow and column flow in gas chromatography?
what is impurity profile. how to interpret this impurity profile to a drug product or drug substance.
Why Ethanol is Used for Standardization of GC Head space?
what is %labelled amount in content uniformity of dosage unit and its calculation?
please explian me about area normalisation method,diluted standard method,impurity vs impurity and which one has to be selected in method development
What is the formula to determine the concentration of M of a solution given the % transmittance? Use %T = 43.7 as an example.
when we talk about change in entropy we consider total entropy means of surround +entropy of system but when we talk about change in Gibss free energy we consider entropy of system.explain with reason.
Home heating oil or furnace oil what is made from? Can (base oil plus diesel/kerosen) = home heating oil?
some product having water content method with pyridine and ethylene glycol mixture instead of methanol? how they are selecting and methanol is not suitable solvent how ?
calibrtion procedue of LC-MS