Global Group
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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