Sample Requirements
Sample Requirement and Submission for the EA and OR AnalysisPlease submit the samples to the old building, in front of the room 181 (second floor). The samples have to be labelled and accompanied by a corresponding submission form. There are special forms for elemental analysis and for the measurement of optical rotation. Blank forms can be found also in the box outside of room 181. A record of each sample has to be written in a logbook located in front of the room 181.
Radioactive samples cannot be accepted. The results of the analysis are fulfilled in the submission form and placed in the box outside of room 181. They are also available on the internal Novell network in the directory I:\MISC\ElemAnal.
Sample requirements for Elemental AnalysisA sample should be submitted as the dry (homogeneous) solid or the neat (non-volatile) liquid. The minimum sample amount for elemental analysis depends on which elements are to be analyzed (see the table bellow). Please, use labelled glass vials for the samples; preferred are labels containing only capital letters and numbers, which are the only characters accepted by the instruments. The expected elemental composition (molecular formula) should be filled in the submission form. In case the expected elemental composition differs more than 0.3% from results obtained (CHN automatic analysis), the measurement is repeated.
Sample requirements for Optical RotationA sample should be submitted as the dry solid or the neat liquid. The minimum sample amount is 2 mg; the more sample you submit the higher accuracy of the measurement is obtained. On the other hand, compounds with high optical rotation can be analysed at amounts of ca 0.5 mg. In this case please indicate precisely weight of the sample or do not hesitate to contact the laboratory staff. The sample will be dissolved in the solvent specified in the submission form. Please pay attention to the solvent selection as only well dissolved samples give accurate results and eventual crystallization can damage rather expensive sample cell. If you want to get back your dissolved sample please provide as with an empty labelled bottle of appropriate size and indicate this fact in the submission form. Furthermore, you should specify the type of cell A (1.5 mL), B (0.5 mL) and C (2.8 mL). The cell A is ordinarily used. The required wavelengths values can be indicated in the submission form, the usual value is 589 nm.
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