Sorptive properties of pea seeds
2001
Hlavacova, Z. (Slovak Agricultural University, Nitra (Slovak Republic))
At testing the dependences of physical properties on the moisture content it is necessary to have the biological materials with various moisture content. The grains and seeds can be moistened, dried in dryer; alternatively the measurements can be realized gradually during the naturally decreasing moisture in many cases. Sorptive properties were observed on three varieties of pea seeds (Junak, Bohatyr and Olivin). The drying can be realized in a drier at a constant temperature or gradually at ambient temperature. The moisture content of whole pea seeds was determined by gravimetric method. The samples were dried at temperature 103 deg C - 105 deg C. The drying time was changed from one hour for seventeen hours. The moisture content was computed according to the relation (1). The method of distilled water addition was used for moistening of pea seeds. The paper also deals with relation for an additional mass of water, which was added into samples for obtaining the desired moisture content. The seed samples with the mass of water calculated according to the relation (2) were located in closed bottles in the refrigerator and they were mixed least 5 - times per day. It was found that the time necessary for achievement asking and rectangular distribution of moisture content was two weeks. In this paper the dependence of the momentary value of moisture content on the drying or moistening time at constant temperature for a pack of pea seeds are presented.
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