Measurement-Procedure-Standardisations.md

@@ -68,7 +68,7 @@ Now the
 <li>Both flow paths are connected to a solenoid valve, which switches at a fixed interval to allow either the sample gas stream (I), or the scrubbed, reference gas stream (Io), to flow through a quartz tube (cell) of accurately known length.</li> 
 <li>Typically a mercury vapour lamp at one end of the quartz cell produces a monochromatic beam of ultraviolet light at 254 nm. A vacuum diode at the opposite end of the cell measures the intensity of transmitted light (I/Io).</li>  
 <li>The intensities of 254 nm UV light transmitted through the sample (I) and ozone-free reference gas streams (Io) are related to the concentration (C) of ozone in the sample gas stream according to the Beer-Lambert Law.</li>
-<li>The analyzer’s microprocessor calculates the absolute concentration in molecules cm-3, and is then converted to a mixing ratio using in-instrument measured sample temperature and pressure. | Gaseous hydrocarbons with strong absorption at 254 nm, such as aromatic hydrocarbons (i.e., benzene and substituted benzene rings)</li>| O3 |
+<li>The analyzer’s microprocessor calculates the absolute concentration in molecules cm-3, and is then converted to a mixing ratio using in-instrument measured sample temperature and pressure. | Gaseous hydrocarbons with strong absorption at 254 nm, such as aromatic hydrocarbons (i.e., benzene and substituted benzene rings)</li></ul>| O3 |