Answer / naresh

Regular usage of old column some stationary phase is loss inside the column compared to new column so compound retention inside the column varies between these two columns

Answer / arul

old coloumn inside some particles may be formed, new coloumn no particles that is reason

Answer / dipty

Because the old column might not be washed properly so the stationary phase which is not used up that is if the column is new it has more chance to hold up the drug.

What is differences between normality and molarity.in which cases both are used?

1 Answers   GVK,

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why hexane is used for FID calibration in GC

1 Answers   Glochem,

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in hplc calibration we are using 0.05% acetone why we are using that one and what happen when its conc increases or decreases

4 Answers   Aurobindo, Cadila, Martin,

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why the sucrose used in calibration of polarimeter

5 Answers   Neuland,

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Hello Dear all; I have a technical question related to analytical Chemistry, I have a sample of (40% w/w) Ferric Chloride solution (for water treatment purposes which consist a little portions of Ferrous Chloride and Hydrochloric acid. I need to know the methods to determine the percentages of each Ferrous Chloride and Chloride acid. Also I want to make sure that this solution is truly (40% w/w). So ANY CLUE !!! Thanks in advance.

2 Answers  

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what is difference between Performance check and Calibration?

1 Answers  

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IN DISSOLUTION TEST S1AND S2 AND S3 CONDITIONS ALL ARE FAILED THEN WHAT IS THE DESSICION U CAN TAKE

12 Answers   Cipla,

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what is titrent,& titrate

2 Answers   Graviti Pharmaceuticals,

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what is MCG dilution in HPLC & GC analysis

1 Answers   Amoli Organics, Cipla,

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What is the difference between c8 and c18 hplc column?

1 Answers  

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if rsd failed then what require to do?

0 Answers  

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how to calculate the Step and ripple accuracy for pump gradient test for UPLC?

1 Answers   Wockhardt,

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