Frequent Questions

We are using the Florisil cartridges described in Method 3620B and we cannot find any that meet the performance checks described in Sec. 8 of the method. Specifically, we cannot get the recovery of trichlorophenol to be less than 5%.

While the use of the Florisil cartridges may require a bit of practice, the root cause of your problem may be the result of an editorial error in the "B" version of this method. At some point during the development of Method 3620B, the units for the cartridge check solution in Sec. 5.11 were changed to milligrams per liter when the units should be micrograms per liter (mg/L versus ug/L). As a result, the cartridge check solution is 1000 times more concentrated than intended and may overload the cartridges, allowing the trichlorophenol to break through. This editorial error was corrected in the latest version of the method, 3620C [PDF File, 106 KB], which is available in Update IVB. 

However, at that time, a new error was introduced in Sec. 5.10, when the units for the trichlorophenol solution were similarly changed and should not have been. The correct concentration for the solution in Sec. 5.10 is still 0.1 mg/L, or 100 µg/L.
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