:: Home Page            
 Advertise your Business Here     
Browse  |   Placement Papers  |   Company  |   Code Snippets  |   Certifications  |   Visa Questions
Post Question  |   Post Answer  |   My Panel  |   Search  |   Articles  |   Topics  |   ERRORS new
   Refer this Site  Refer This Site to Your Friends  Site Map  Bookmark this Site  Set it as your HomePage  Contact Us     Login  |  Sign Up                      
Categories >> Sciences >> Chemistry >> Analytical Chemistry


 Organic Chemistry interview questions  Organic Chemistry Interview Questions (221)
 Inorganic Chemistry interview questions  Inorganic Chemistry Interview Questions (95)
 Analytical Chemistry interview questions  Analytical Chemistry Interview Questions (833)
 Physical Chemistry interview questions  Physical Chemistry Interview Questions (57)
 General Chemistry interview questions  General Chemistry Interview Questions (282)
 Chemistry AllOther interview questions  Chemistry AllOther Interview Questions (65)
wt is rsd in and explain
 Question Submitted By :: M.dinesh
I also faced this Question!!     Rank Answer Posted By  
  Re: wt is rsd in and explain
# 1
RSD means Relative standard deviation. If we inject same
sample 5 injections the deviation b/w these area or RT is
called as RSD

RSD = Standard deviation *100/mean(area or RT)
Is This Answer Correct ?    43 Yes 2 No
  Re: wt is rsd in and explain
# 2
RSD = Standard Deviation/ Average * 100

Average is '(same sample is analyzed for 5 times with the
same conditions of instrument)the average of results.

RSD used to Know the precision. If the RSD is less than 3%,
That is precision is good.
Is This Answer Correct ?    1 Yes 1 No
  Re: wt is rsd in and explain
# 3
Relative Standard Deviation.
RSD= S.D*100/ Mean.

In short This is to Explain the UNCERTANITY in your Analytical Result. We don't Know the true Value.

Uncertanity can be Quantified in different ways.

I Know the following
1.Significant figures method
2.Error propagation Method and
3. Statistical Method
Is This Answer Correct ?    0 Yes 0 No
Rama Rao Kethineni

Other Analytical Chemistry Interview Questions
  Question Asked @ Answers
What is Spliit and Splitless in Gas Chromatography nad How does it work? Sterling 4
why KF factor is between 4.5 to 7.5 mg/ml ? why ? why sometime pyridine is used in analysis like in raw material solvent like acetone etc? GVK 6
if v use HELIUM & ARGON instead of NITROGEN as a mobile phase what happen in GC SYSTEM ? Cipla 3
why we use TLC?   6
difference between AAS & flame photo meter ?   2
How will you select mobile phase in HPLC Method Development   3
What is the correct way to digest milk powder to get the corrrect value of Fe and Zinc?   1
what is the difference between LOSS ON DRYING IN ORDINARY OVEN TECHNIQUE AND VACUUM OVEN TECHNIQUE Divis-Laboratories 2
state the principle of gas chromatography?   4
why required specificity in valdation   3
how to hplc calibrated   3
For more Analytical Chemistry Interview Questions Click Here 

Copyright Policy  |  Terms of Service  |  Articles  |  Site Map  |  RSS Site Map  |  Contact Us
Copyright 2013  All Rights Reserved.   ::