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Published in Frank R. Spellman, Fundamentals of Wastewater-Based Epidemiology, 2021
Several precautions that can help to increase the reliability of test results: Use extreme care when measuring samples, weighing materials, and drying or cooling samples.Check and regulate oven and furnace temperatures frequently to maintain the desired range.Use an indicator drying agent in the desiccator that changes color when it is no longer good—change or regenerate the desiccant when necessary.Keep desiccator cover greased with the appropriate type of grease—this will seal the desiccator and prevent moisture from entering the desiccator as the test glassware cools.Check ceramic glassware for cracks and glass fiber filter for possible holes. A hole in a glass filter will cause solids to pass through and give inaccurate results.Follow the manufacturer’s recommendation for care and operation of analytical balances.
Concrete
Published in A. Bahurudeen, P.V.P. Moorthi, Testing of Construction Materials, 2020
The cured specimens are placed with the end faces exposed in a vacuum desiccator (faces should not touch down). Vacuum desiccator is sealed and connected to a vacuum pump. The vacuum pump is started and run until a pressure of 50 mm Hg (6650 Pa), or less is reached. The vacuum is maintained for 3 hours.
Combining osmotic–steam blanching with infrared–microwave–hot air drying: Production of dried lemon (Citrus limon L.) slices and enzyme inactivation
Published in Drying Technology, 2018
Saturated solutions (lithium chloride, magnesium chloride, sodium bromide, sodium chloride, and potassium nitrate) were kept in the desiccator to maintain relative humidity from 10 to 90% at 40°C temperature.[454647] The large-capacity desiccators (5.6 L) were used in the study as the weight of intact dried lemon slices was in the range 5–10 g due to the intake of salt during osmotic pretreatment. The size reduction of dried slices was avoided as it can alter vapor transfer phenomena due to change in the structure of lemon tissues. The desiccators were placed inside the temperature-controlled chamber. The shelf life was predicted under accelerated storage condition (40°C and 90% RH). Moisture content and water activity of each sample were estimated after weight loss study.