Analytical Chemistry Interview Questions
Questions Answers Views Company eMail

What are the different types of columns used in HPLC

Wockhardt,

3 8752

In HPLC when we use Isocratic method, Gradient method in hplc?

Pharmaceutical,

8 13982

Any molecule is filing for ANDA purpose, what are the dissolution requirements / specifications needed ?

IPCA,

1 3919




What is Endcapped Hplc column

2 6523

Why we more noise in PDA detector compared to UV detector?

Aurobindo,

1 8514

if the purity is 99.9%,is need to do assay?

Reddy Labs,

3 11146

What is the difference between specified impurity and Identified impurity

Glenmark,

3 9436

What is the difference between specified impurity and Identified impurity

Merchant Navy,

1 2736




how do you established the RRF for unknown impurity

Square Pharma,

3 7810

I want analyze my compound at 325 nm so which standard shall i use to calibrate my HPLC system? How i can assure my hplc detector is suitable or not?

AMRI,

2 6399

How we will choose pH of a mobile phase if analyte pKa value is 4

Laurus, Celon Labs,

2 7951

what parameters we will consider while developing a HPLC method and how we confirm our HPLC method is valid?

Laurus, DRL,

2178

Which column is more polar, C8 or C18?

Glenmark, Cipla, Laurus, Torrent Power,

6 20060

what is the difference between heavy metals and sulphated ash

Aurobindo,

2 11295

what is difirence b/w ROI&ROE

Pfizer,

1 6690


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Un-Answered Questions { Analytical Chemistry }

Why we check moisture,ash & AIA in product

456


Why a1% value is used for some product ? What is the criteria for selection a1% value ?

926


How can we confirm the HPLC column is end-capped or not? Is it possible to identify by physical appearance?

1821


what is difference between zero air gas and o2 gas

6072


Why only hydroxy naphthol blue indicator is used for standardisation of 0.05M EDTA solution instead of solochrome Black T or Euriochrome Black T indicator which is used for all sample analysis with 0.05M EDTA solution?

975






what is difference between UV - VISIBLE MODEL NO like 1600,1601,1700 etc ? plz explain me

1177


what is separation techniques.

1322


What is the difference between purge septum flow and column flow in gas chromatography?

760


which one is better separation in high pressure liquide chromatogram orlowpressure chromato gram in hplc

916


How to choose concentration of LOQ solutions for RS analysis? Example.

733


iam usig ph buffers merk. manually how to prepare ?

970


why we use a particular hplc column for a particular compound give reasons?please

1490


Which products will produce when acetic anhydride reacts with Ter-butanol, Sec-butanol, Iso butanol, Dimethylamine etc.

1406


What is the difference between Discriminating media and DPDM(Dissolution Profile with Different Media)

5246


explain 5 components of gas chromatography ?

638