How much turbidity can the Lachat Flow Injection Analysis (FIA) methods handle?

Dokument-ID

Dokument-ID TE6623

Veröffentlichungsdatum

Veröffentlichungsdatum 05.01.2022
Frage
How much turbidity can the Lachat Flow Injection Analysis (FIA) methods handle?
Zusammenfassung
Turbidity concerns with Lachat FIA
 
Antwort
Lachat does not have a "set limit" for turbidity recommended before filtering samples
  • Turbid samples can clog the injection valve and filaments can get stuck in the flow cell. 
  • Turbid samples should typically be filtered. Care needs to be taken with ammonia samples as filtering can introduce contamination.
  • If the valve does get clogged or something gets stuck in the flow cell, the user may try pumping 1 molar hydrochloric acid or 1 molar sodium hydroxide through the manifold. 
  • If turbidity does not cause clogs but does reach the detector it can cause a positive response as the turbidity scatters light. Turbid samples may be analyzed without the color reagent to determine if there is a significant response.  If there is, the results can be subtracted from the results with the color reagent. 
  • In some cases, it may be possible to analyze by dialysis. This removes the analyte from the sample itself.  This is typically only a solution for volatile analytes such as ammonia and cyanide.

Hat dir diese Antwort geholfen?

Wird gesendet...
Vielen Dank für Ihr Feedback.
Beim Senden ist ein Fehler aufgetreten. Versuchen Sie es erneut.