Number of air exchanges per hour

Table 1. Number of air exchanges per hr (Ec), determined with CO2, (100%) as tracer gas and the time (in hours and days) required for one exchange of the headspace volume (Ec-1) for different container types. All values are the mean of 4 replicates (STD: standard deviation).

Container type (description)

Ec(h-1)

(STD)

Ec -1 in h

Ec -1 in days

1. body: Meli-jar with a nick in the glass rim closure: PP screw on lid with sampling device (rubber septum)

1.20

(0,32)

0.1832

0.035

2. body: Meli-jar without nick closure: idem 1 + rubber ring between body and closure

5.83. 10-3

(6.05. 10-3)

171.6

7.150

3. body: idem 2 + sampling device (rubber stopper) closure: idem 2 + clamp system

5.53.10-4

(3,32.10-4)

1806

75.26

4. body: idem 3 closure: PP membrane (15µm) + rubber ring between body and closure + clamp system

2.4. 10-3

(2.2. 10-3)

423.6

17.15

Fig.1. equipment for the experiment