Difference between uv detector nd RI DETECTOR? wt s the difference between OVI Solvents nd residual solvents incase of GAS CHROMATOGRAPHY? nd wt s its detection limit?
3 11002on what basis SOP's can be changed? IF mobile phase ratio is 70:30 to how much % can we change the ratio in HPLC process
7 11119how do start hplc method development? how much sample required for developing the method development?
3 41136which pharmacopeoia mentions that caffiene is used as a standard for HPLC calibration? which other standardscan be used for the same?
1 5458Why will a solution of aspirin without acid or basic hydrolysis give yellow colour with a solution of Ferric chloride?
1 3647In HPLC what is Single point threshold, peak purity index and minimum peak purity index? what should be consider for pure peak.
3 22048Post New Analytical Chemistry Questions
How can the GC or HPLC method is selected to determine the impurity profile in drug product?
why sre you used Potassium hydrogen phthalate in standarisation of 1N NaOH and 0.1 N Perchloric Acid?
What is AV value in test uniformity content ,describe calculation
Why we check moisture,ash & AIA in product
can we use the same detector in HPLC as well GC and what could be the differences we can find in the final chromato graph in any aspects?
2. Two grams of Benzoic acid are dissolved in 200 ml of water and extracted with 200 ml of diethyl ether. The distribution coefficient of benzoic acid is 100, and its dissociation constant is 6.5 10-5. Calculate the distribution ratio (D) of benzoic acid at pH 2, 5, and 6. 3. Calculate D at pH 2 to 10 (1 unit apart) in the above problem, and plot D versus pH.
using gradient pressure in gas chromatography are not ?using gradient pressure why
Why to use propyl paraben in HPLC gradient calibration
1)What's the meaning of Absorption,give a example. 2)What's the meaning of Adsorption,give a example. 2)what is the difference between Absorption and Adsorption.
why disodium tartarate used in karl-fischer instrument ?.
What are the primary considerations in extractables and Leachables ?
In HPLC (Waters) software Empower1,2 &3 what is the updation for each version
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?
what is the purge flow & how to calculate
How can we calculate offset value pH measurment
