Answer Posted / anil

There is no Integration function in the conventional UV-Vis spectrophotometer which
accumulates the signal. For example, the total required time will be 1000 sec. for 1000 data
points and it takes 1 sec. to measure one datum. In this case, all 1000 data have the same signal
to noise ratio (S/N).
But in a PDA instrument which has a 1000 photodiode array, 1000 data points can be
measured in 1 sec. and it would take 1/1000 sec. to achieve the same result obtainable in 1 sec.
in a conventional instrument. Therefore, when the same sample is measured for 1000 sec in a
PDA instrument, the signal is accumulated and is 1000 times greater than when measuring for 1
sec. The noise will be 10001/2
. This means that the S/N ratio is improved by 10001/2
.
This resulting benefit of fast data acquisition is termed Felgett’s S/N Advantage or
Multichannel Advantage

How they found 1mL of K.F reagent is equivalent to 5mg of water and if we change the composition of K.F reagent, is it can neutralize more amount of water?

1780

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sop of a uv visible spectrophotometer double beam elico model

5928

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which situation gc hs and gc als require to use?

793

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In GC calibration,what is the procedure to calibrate the TCD (thermal counductivity detector)suggest ?

3179

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why does used dry caffien in HPLC calibration?

2032

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which batch require to use for analytical method validation?

811

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if content uniformity passing but dissolution varrying then what is next step?

883

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What is importance of pH in the Heavy metal test and How it effect on the test results?

2287

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Why six unit used for precision?

1356

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what is the purge flow & how to calculate

2648

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How to start the dissolution development for unknown tab?

1684

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

2587

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What is intact assay method development.....?

2668

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What is delay volume?

1397

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Why potassium dichromate is used in calibration of uv?

1990

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