Storage cleaning procedure

The first aim of this work was to study the influence of an unwashed membrane filter on the cadmium, lead, and copper concentrations of filtered seawater samples. It was also desirable to ascertain whether, after passage of a reasonable quantity of water, the filter itself could be assumed to be clean so that subsequent portions of filtrate would be uncontaminated. If this were the case, it should be possible to eliminate the cleaning procedure and its contamination risks. The second purpose of the work was to test the possibility of long-term storage of samples at their natural pH (about 8) at 4 °C, kept in low-density polyethylene containers which have been cleaned with acid and conditioned with seawater. 

Vibrational spectra were recorded using the polarization-modulated infrared reflection absorbance technique (PM-IRRAS). The spectrometer, the electrochemical cell, and the sample preparation and cleaning procedures are all described elsewhere (1 7) All of the measurements were performed using 0.5 M SO solutions, either with or without an added nitrile compound or SnCl,. The solutions were saturated with CO by bubbling the gas through their storage reservoirs before admitting them into the sample cell. 

A final point to remember is that after the proper (i.e., the one fitting the conditions and requirements of a given surface) cleaning procedure has been completed, care must be taken to ensure that the surface will not be recontaminated during subsequent storage. 

This quality assessment study indicates that to use resins for broad spectrum analysis, the resin elution, storage, cleaning, and reuse procedures must be rigorously defined so that the artifacts produced do not interfere. Once the procedures have been defined, they must be strictly followed. 

Preparation equipment should be designed so it can be easily and thoroughly cleaned. Procedures for cleaning, sanitation, and storage of production equipment used in radiopharmaceutical production must be established. Special training is necessary for personnel involved in this kind of work with regard to both clean-room aspects and radiation protection aspects. 

Cleaning procedures for bulk storage and handling systems are beyond the scope of this chapter. For a thorough discussion of this topic, the reader is referred to List and Erickson (31). 

For the cleaning procedure performed for the sample cell assembly in which a chemical, which has solidified after the isothermal storage test, is confined, refer to a footnote in Subsection 10.2.5. 

As far as chemical variables are concerned, especially in case of trace determinations, all the steps of sample collection, treatment in the field and storage must be carefully considered in order to maintain sample integrity before analysis. In this respect the selection of appropriate equipment and non-contaminant materials, as well as the application of efficient cleaning procedures, are of paramount importance. For the most critical applications clean chemistry laboratories (equipped with Class 100 laminar flow cabins) must be available in the field or on board. 

The period and conditions for storage of unclean equipment before cleaning, and the time between cleaning and equipment reuse, should form part of the validation of cleaning procedures. 

If sampling is performed in the storage area, it should be conducted in such a way as to prevent contamination or cross-contamination. Adequate cleaning procedures should be in place for the sampling areas. 

Preparation, ventilation, and cleaning procedures for stationary petroleum and petrochemical storage tanks. Tank cleaning, permits, ventilation methods, tank entry, flammability and toxicity hazards, and special considerations for tank design and contents. 

Adequate validated cleaning procedures should be employed to prevent cross contamination, and steps should be taken to ensure the secure storage of the veterinary medicinal product in accordance with the guide. 

Cleaning procedures of premises, equipment, containers etc. shall be established for workshop, production processes and production steps according to production requirements and class of cleanliness. They at least contain cleaning method and process, interval, cleaning agents or disinfectants used, cleaning tools and place for their storage. 

There should be written cleaning procedures and schedules for manufacturing and storage areas. 

The sampling and storage containers, and any reagents used for sample preservation, have to be checked for mercury contamination at an appropriate level. Special cleaning procedures, such as washing with hydrochloric or nitric acid, might be necessary. However, storage of samples does not only involve a risk of contamination-, also the possibility of loss of mercury has to be considered (see Aqueous samples section). 

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