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WHY given much noise PDA dector then VWD
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why we get only one peak in assay by hplc but in rs by hplc get more peaks
what is the significant of pH in HPlc?
why we are used 4,7,9,2 buffers for the ph calibration
4 Answers Aurobindo, Enaltec Labs,
importance of internal standard and in what conditions it is used?
what is the need of calulation of RRF of impurity in HPLC analysis?
If suppose 10 methods of dissolution given in pharmacopoeial for single content product then which method out of 10? or all 10 require to follow?
Why PH range from 0to14.
2 Answers College School Exams Tests, Reddy Labs, Wings Customer Care,
acetic acid is weak acid & perchloric acid is strong acid.but how perchloric acid is soluble in acetic acid
Why a1% value is used for some product ? What is the criteria for selection a1% value ?
What should be the calibration procedure for wavelength accuracy in case of HPLC?
why we inject sample TWICE in ASSAY by HPLC analysis but in RS once?
4 Answers Aurobindo, DRL, Neuland,
What are the six USP melting point reference standards?
Organic Chemistry 
