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장비명
Liquid filters – Specified Wavelength method
Wavelengths
175-385 nm

Liquid filters – Specified Wavelength method

 

.  Qualifying the Stray Light of UV spectrophotometers

.  A range of liquid permanently sealed by heat fusion into Far UV quartz cells, covering the wavelength range from 175 nm to 385 nm

.  The Specified Wavelength method is approved by the European Pharmacopoeia

 

 


 

 

 

기본구성

The USP and EP have different recommendations for the use of these materials

 

 

 

Cut-off wavelength

Material

Concentration

USP <857>

EP 2.2.25

Potassium Chloride

12 g/l

2.0 A at 198 nm

2.0 A at 198 nm

Sodium Iodide

10 g/l

2.0 A at 220 nm

3.0 A at 220 nm

Potassium Iodide

10 g/l

2.0 A at 220 nm

3.0 A at 250 nm

Acetone

Spectroscopy grade

2.0 A at 300 nm

Not specified

Sodium Nitrite

50 g/l

2.0 A at 340 nm

3.0 A at 340 nm

 

 

 

3.0 A at 370 nm

 

Note: for USP compliance, either Sodium Iodide or Potassium Iodide may be used at 220 nm

 



 

 

 

 

 

 

 

 

 

 

 

 

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