Es werden zwei Waschverfahren für Platten, die zur Kupferchloridkristallisation im Beisein eines Zusatzes gebraucht werden, vorgestellt. Das eine benutzt zunächst ein Bad mit einer verdünnten Lösung eines Reinigungsmittel (RBS), das andere lediglich zweimaliges Waschen in kochendem destilliertem Wasser. Die Anfangszeiten der Kristallisation (t1) sind wenig gestreut, aber ihre Mittelwerte unterscheiden sich deutlich je nach Waschmethode. Die Streuungsindices, die angeben wie viel Schalen im Bereich von ± 30 min um die Mediane t M (Ni), oder im Bereich von 60 min nach Kristallisationsbeginn in einer Serie von Schalen (N60), sind hoch. Der Unterschied zwischen den Waschmethoden ist nicht signifikant für Ni, schwach signifikant für N60. Die zwei Methoden sind gleichwertig in Bezug auf die Qualität der Kristallisationsbilder und deren Lesbarkeit. Die Textur-Kristalle sind jedoch feiner mit der ersten Methode; die Ursache dafür sind RBS-Rückstände, die mit der Tropfbildmethode nachgewiesen wurden. Beide Waschverfahren sind besonders einfach und schnell und können die Vorbereitung der Platten für die Kristallisation sehr erleichtern.
N1 -Two methods are presented for washing plates used for crystallisation with additive. The first involves an initial bath containing a dilute solution of detergent (RBS), the second uses only two successive baths of boiling distilled water. The times of appearance of the first crystal nuclei (t1) vary only slightly but their means differ significantly according to the washing method. The indices of variability, which comprise the number of dishes within a 30 minute period around the median tM (Ni), or for 60 min from the appearance of the first nucleus in a series of dishes (N60), are high. The difference between washing methods is not significant for Ni, but is significant, though only slightly, for N60. The two methods are equivalent regarding the quality and readability of the crystallograms. An increased fineness of the crystals which compose the texture due to the presence of traces of RBS (detected by the hydrodynamic method), is however observable with the first method. These two methods, particularly simple and rapid, should greatly facilitate the preparation of the supports used for crystallisation.
AB -Two methods are presented for washing plates used for crystallisation with additive. The first involves an initial bath containing a dilute solution of detergent (RBS), the second uses only two successive baths of boiling distilled water. The times of appearance of the first crystal nuclei (t1) vary only slightly but their means differ significantly according to the washing method. The indices of variability, which comprise the number of dishes within a 30 minute period around the median tM (Ni), or for 60 min from the appearance of the first nucleus in a series of dishes (N60), are high. The difference between washing methods is not significant for Ni, but is significant, though only slightly, for N60. The two methods are equivalent regarding the quality and readability of the crystallograms. An increased fineness of the crystals which compose the texture due to the presence of traces of RBS (detected by the hydrodynamic method), is however observable with the first method. These two methods, particularly simple and rapid, should greatly facilitate the preparation of the supports used for crystallisation.
ST - Techniques for washing the supports used for copper chloride crystallisation with additive UR - https://dx.doi.org/10.18756/edn.98.5 Y2 - 2024-12-22 09:53:43 ER -