At 254 nm < 0.002 AU
At 254 nm < 0.001 AU
UV 205 nm < 0.01 AU
UV 210 nm < 0.01 AU
UV 254 nm < 0.005 AU
At 365 nm < 1 ppb
Compliance with suitability for LC/MS: Reserpine test
Reserpine at 609 m/z in ESI +
The LC-Pak cartridge was extensively validated to ensure that the water quality at the outlet matches the most demanding requirements.
| Parameter | Specification of LC-Pak ultrapure water | Comments |
| HPLC Gradient Test - Absorbance of highest eluted peak | At 210 nm < 0.006 AU At 254 nm < 0.002 AU | Concentration of 60 mL water at 1 mL/min prior to elution |
| HPLC Gradient Test - Absorbance of highest eluted peak | At 210 nm < 0.003 AU At 254 nm < 0.001 AU | No water preconcentration |
| Optical properties: absorbance in UV range | UV 200 nm < 0.05 AU UV 205 nm < 0.01 AU UV 210 nm < 0.01 AU UV 254 nm < 0.005 AU | |
| Fluorescence as quinine | At 254 nm < 1 ppb At 365 nm < 1 ppb | |
| Compliance with suitability for LC/MS: Reserpine test | No peak higher than 10 ppb Reserpine at 609 m/z in ESI + | |
| Residue after evaporation | < 0.0001 % w/w | Test performed as specified in ISO 3696 procedure |