Method for Determining and Controlling the Formation of Deposits In a Water System
The invention relates to a method for determining and controlling inorganic and/or organic deposits in a water system, preferably a paper and/or board machine re-circulation system. According to said method, one or more probes are introduced into the water system, then removed from said system after a pre-selected exposure period and prepared for surface analysis. The deposits that have accumulated on the probes are determined by means of microscopy methods and/or gas chromatography methods and/or mass spectrometry methods.
1 . A process for the determination and control of inorganic and/or organic deposits in an aqueous system, preferably a paper and/or board machine circulatory system, with one or more specimens being introduced into the aqueous system, said specimens being removed from the system after a preselected exposure period and prepared for a surface examination, characterized in that the deposits formed on the specimens are determined with microscopic methods and/or gas-chromatographic and/or mass-spectroscopic methods.
2 . The process according to claim 1 , characterized in that the specimen(s) is/are introduced in tanks, containers for additives, splashed water areas or in all positions of the aqueous system under investigation with wetting or high humidity.
3 . The process according to either claim 1 or claim 2 , characterized in that the exposure period after which the specimen(s) is/are removed from the system is chosen so that the period ranges from one hour up to 100 days.
4 . The process according to claim 3 , characterized in that the specimen(s) is/are left for the preselected exposure period in the aqueous system under investigation and, at the end of the selected period, the specimen(s) is/are removed from the system and immediately prepared for the subsequent surface examinations, the specimens then being analysed as fresh samples or at a later point in time as samples fixed directly at the aqueous system to be observed.
5 . The process according to any one of claims 1 to 4 , characterized in that the deposits formed on the specimen(s) are determined with electron-microscopic methods and/or electron-spectroscopic methods.
6 . The process according to any one of claims 1 to 5 , characterized in that the deposits formed on the specimen(s) are determined with scanning electron microscopy (SEM), confocal laser scanning microscopy (CLSM) and epifluorescence microscopy (EP).
7 . The process according to any one of claims 1 to 6 , characterized in that the organic deposits formed on the specimen(s) are determined with pyrolysis gas chromatography with a coupled mass spectrometer (Py-GC/MS) or infrared microscopy.