What Is Residence Time?

Residence time, also known as boarding time, refers to the average time it takes for an element or substance to enter a geochemical reservoir and leave the reservoir in a steady state. The calculation formula is as follows: For a specific process, the single (or partial) residence time can be calculated using the following formula: where: M is the total amount of material in the library (mass unit); is the sum of the output rates (same mass unit / unit as M) Time); Ki is the migration rate constant. The inverse relationship between reaction residence time and migration rate constant. At the same time, the residence time T has such a rule: that is, when in a stable condition, the reciprocal of the boarding time of an element in the geochemical library is equal to the sum of the reciprocal of the boarding time of the element migrated from each individual output in the library. The residence time is short, and the material flows fast, which is closely related to the migration rate of the material.