In order to avoid contamination of the molten glass by refractory materials, it is often recommended that crucibles be made of platinum either the pure metal or alloyed with 2 to 20 percent rhodium or 5 percent gold.
Companies producing only sodium chloride will discard the brine well before reaching the saturation point of other salts in order to avoid contamination, but producers of potassium salts will continue the evaporation process in order to extract as much of the sodium ion as possible before their desired product reaches saturation.
Great care was taken when drilling samples from the bones in order to avoid contamination.
In order to avoid contamination, the bottles were properly rinsed with distilled water and dried in the Laboratory.
In order to avoid contamination from multipath effects, only S4 data from satellites more than 30° above the horizon were considered.
In order to avoid contamination, all the fragments were carefully cleaned and the outer layers were removed by a diamond drill.
In order to avoid contamination with VH genes, the variable regions of heavy-chain immunoglobulins (VHH) were amplified by nested PCR.
In order to avoid contamination of the fermentation process and the product with pathogenic microbes, mixed culture was gradually replaced by pure culture.
In order to avoid contamination by air, all of the components are installed in a vacuum vessel or in a vacuum glove box.
The hygienic state of tanks is important in order to avoid contamination of the end product and, therefore, tank cleaning is receiving increasing attention.
Our results emphasized the need for pretreatment of wastewater and routine monitoring in order to avoid contamination of food crops from the wastewater irrigation system.
