jenway 6850 Operating Manual

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jenway 6850 Operating Manual Manual pdf 16 page image

163.4 GOOD PRACTICE GUIDELINES1. For optimum performance all spectrophotometers should be sited in a clean, dry, dustfree atmosphere. When in use ambient temperature and light levels should remain asconstant as possible.2. If required adherence to Standard Operating Procedures (SOP) and Good LaboratoryPractice (GLP) should be monitored with regular calibration checks and a suitable QualityControl (QC) programme.3. The sample chamber lid must be fully closed during measurement and before anyreadings are recorded or printed.4. The correct selection of sample containers is imperative for accurate and reproducibleresults:a) Check that the material of the sample container is compatible with the wavelengths tobe used for measurement. In general glass can only be used down to 360nm or320nm depending on quality. Standard plastic cuvettes can be used down to 320nm.Special UV versions can be used down to 260nm. Below this level quartz cuvettesmust be used.b) Plastic disposable cuvettes should only be used ONCE.c) Glass cuvettes should be thoroughly cleaned after use. Discard when scratchesbecome evident on optical surfaces.d) Care should be taken when selecting semi-micro or micro cuvettes. The cuvettewindow on the inner chamber (the area filled with sample) must be wider than theaperture in the sample holder or light will reach the detector without passing throughthe sample. In this case, semi-micro or micro cuvettes with self-screening blacksurrounds must be used or, alternative holders for these cuvettes should be used.e) Glass test tubes and other sample tubes should be used with care. Where possible,matched tubes should be used and any index mark set to the correct position beforemeasurements are made.f) Ensure any sample containers used are compatible with the constituents of both thesamples and standards they are to hold. Plastic cuvettes are not compatible withorganic solvents.g) All sample containers must be handled with care; by the top, bottom and non-opticalsurfaces only. Any finger marks evident must be removed by a suitable cleaningprocess.