Studies on Measuring Method of Respiration Rates of Fruits and Vegetables (Part 2)

——Identification of Error in Respiration Rate and Conditions Required for Conventional Formula and Proposal of Modified Formula for a Flowing System in a Steady State——

Abstract

In the conventional formula for a flowing system the rate of outflow is considered to be the same as the inflow. The difference is strictly recognized when respiratory quotient deviates from one. Therefore, a modified formula for a flowing system including ethylene was derived for the gas exchange among the commodity, inside and outside of a respiratory chamber. The error obtained in the respiration rate using the conventional formula showed that it was dependent on the respiratory quotient, ethylene production ratio, and outflow concentration. A modified formula in a steady state, which was independent of these factors, is proposed. The conditions of the conventional formula, which can be used, were identified. Furthermore, a method for determining the flow rate and the time at which measurements should be started was determined.