WHY given much noise PDA dector then VWD Dector

587

How we performed the force degradation for drug substance, is any specific guideline is available for each parameter(Acidic, basic, oxidation,heat)? what conditions you mentained for above parameters.

928

For limit test of heavy metals in BP, Method C require that the substance is ignited at a temperature not exceeding 800 °C. Why confines such the temperature?

2219

What are modes of quantification in related substances

802

What is Band broading effect explain

477

why does used dry caffien in HPLC calibration?

500

if you have given a blank water how you analyse by general analytical techniques?

627

what is the limit for KF Factor ,we take factor using water we will found factor between 6 to 7 ,while on KF Reagent bottle mentioned 5 mg/ml water content.if we not use dried methanol it is effect on factor.

624

How can the GC or HPLC method is selected to determine the impurity profile in drug product?

5247

Home heating oil or furnace oil what is made from? Can (base oil plus diesel/kerosen) = home heating oil?

781

why disodium tartarate used in karl-fischer instrument ?.

609

I have compare C2H2-air and C2H2-N2O flame AAS on determination calcium. Both use same range of std to plot calibration curve. (2-6ppm) When i measure the sample with phosphate, KCl and LaCl, C2H2-N2O flame give false positive result, around 0.5ppm. When i measure the sample with phosphste, KCl and EDTA. C2H2-N2O flame also give 0.5ppm false positive. But both above mentioned sample would not give false positive when measured by C2H2-air flame. What is the reason?

1944

In HPLC calibration, caffeine is used as primary standard for wave length calibration due to caffeine is having dual maxima at 273 & 205 nm and one minima at 245 nm. Any body can give reference of these details from any pharmacopeia (with chapter no.) or any other authentic guideline?

226

Why acetonitrile and water are used as extraction solvent when analysis melamine? I thought they are miscible and won't be able to separate...

135

why equlirium conatant of water have 14 value

841