Figure 6
From: Detection of hydrogen cyanide from oral anaerobes by cavity ring down spectroscopy
The sampling and measurement setup for HCN detection in the headspace of bacteria.
(a) For aerobic bacteria indoor air was used as a carrier gas. The flow rate was controlled by a mass flow controller. (b) For anaerobic bacteria, anaerobic gas mixture (5% CO2, 10% H2 and 85% N2) was used as a carrier gas. Flow rate was controlled by mass flow controller. The pressure in the airtight container was monitored by pressure gauge and adjusted by a needle valve.
