Summary
The design of the Metrohm antidiffusion tips with the antidiffusion valve makes it possibleto do very accurate dosing. The principle is a ‘pressure valve’ which opens synchronously to the movement of the piston from the Dosing unit, depending on the pressure in the tubing, and relocks when the pressure in the tubing drops. This principle makes sure, that the volume
stream stops abrupt after stop of the piston movement and no formation of drops and no leakage of titrant occurs afterwards. If this mechanism doesn’t work properly then it is
possible that after a dosing step a volume different from the documented leaks from the anti diffusion tip. This ‘leakage’ may furthermore cause a delayed stabi-
lization of the measured signal and may hence create erroneous, inaccurate results.
Metrohm recommends the use of the titrimetric volume test method described below as the Standard Operating Procedure for validating Metrohm antidiffu-
sion tips (6.1543.200, 6.1543.130 & 6.1543.140, each with 62726.090 antidiffusion valve).
This titrimetric volume test can be used for the following purposes:
• Quality assurance by the manufacturer
• Quality assurance of analytical or other measuring systems by the user
The described method is not an official reference method.
Articles
The design of the Metrohm antidiffusion tips with the antidiffusion valve makes it possibleto do very accurate dosing. The principle is a ‘pressure valve’ which opens synchronously to the movement of the piston from the Dosing unit, depending on the pressure in the tubing, and relocks when the pressure in the tubing drops. This principle makes sure, that the volume
stream stops abrupt after stop of the piston movement and no formation of drops and no leakage of titrant occurs afterwards. If this mechanism doesn’t work properly then it is
possible that after a dosing step a volume different from the documented leaks from the anti diffusion tip. This ‘leakage’ may furthermore cause a delayed stabi-
lization of the measured signal and may hence create erroneous, inaccurate results.
Metrohm recommends the use of the titrimetric volume test method described below as the Standard Operating Procedure for validating Metrohm antidiffu-
sion tips (6.1543.200, 6.1543.130 & 6.1543.140, each with 62726.090 antidiffusion valve).
This titrimetric volume test can be used for the following purposes:
• Quality assurance by the manufacturer
• Quality assurance of analytical or other measuring systems by the user
The described method is not an official reference method.
Articles
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