1.0 OBJECTIVE
To check the performance of equipment for reliable and accurate results.
2.0 SCOPE
This procedure is applicable to calibrate U.V./Visible spectrophotometer, installed in the quality control department.
3.0 RESPONSIBILITY
3.1 Doing: Technical Assistant/Executive
3.2 Checking: Executive /Manager
4.0 ACCOUNTABILITY
Head of the Department
5.0 PROCEDURE
Frequency: Once in a three month
5.1 Operate the instrument as per respective S.O.P.
5.2 CONTROL OF ABSORBANCE
5.2.1 Weigh accurately about 60mg of potassium dichromate previously dried at 130°C for 3 hrs. & dissolve in 0.01N sulphuric acid to produce 1000ml.
5.2.2 Take the absorbance of the above solution at the wavelength mentioned below and calculate A(1%; 1cm) and record the results as per the Annexure-I.
Sr. No. Wavelength Limit
1 235nm 122.9-126.2
2 257nm 142.4-145.7
3 313nm 47.0-50.3
4 350nm 104.9-108.2
5.2 WAVELENGTH ACCURACY (HOLMIUM FILTER SPECTRUM)
5.3.1 Perform baseline correction with reference to air.
5.3.2 Put the holmium oxide filter into the cell compartment and record the absorbance spectrum between 200nm and 600nm.
5.3.3
Sr. No. Wavelength Limit
1 241.15nm + 1 nm
2 287.15nm + 1 nm
3 361.50nm + 3 nm
4 536.30nm + 3 nm
5.4 RESOLUTION POWER
5.4.1 Prepare 0.02% v/v solution of toluene in hexane.
5.4.2
5.4.3 Record the result in Annexure-I. It should not less than 1.5
5.5 LIMIT OF STRAYLIGHT
5.5.1 Prepare 1.2% w/v solution of KCl in distilled water.
5.5.2 Take spectrum between 190nm to 210nm and take the absorption at 200nm.
5.5.3 Record the results in Annexure-I. It should more than 2.0.
5.5.4 The performance of the instrument is satisfactory if the observed wavelengths are within the above tolerance limit.
6.0 ABBREVIATIONS
nm= Nanometer
U.V= Ultraviolet
ml=Millilitre
KCl =Potassium chloride
SOP = Standard operating procedure
w/v = Weight per volume
% = Percentage
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