The amount of dissolved oxygen in the diluted sample is measured, and the samples are then stored at a constant temperature of 20 degrees Celsius (68 degrees Fahrenheit).
(The amount of dissolved oxygen in the diluted sample; is measured; ) (the samples; are stored; L:at a constant temperature of 20 degrees; T:then)
The amount of dissolved oxygen in the diluted sample the samples
is measured are stored
L:at a constant temperature of 20 degrees T:then