Talk:AutoAnalyzer

message: I suggest moving the Flow injection analyzer section to Flow injection analysis.  Biscuittin (talk) 20:50, 22 July 2008 (UTC)
thread_title:  Flow injection analyzer 

message: While I appreciate the overview, I found the safety section confusing and not relevant. The section author rambles about odd things. I don't know enough about SFA and FIA to offer a good edit at this time. Cheers.
:: - I removed it completely.  Lateg (talk) 21:05, 31 July 2011 (UTC)
thread_title: safety section

message: The basic prinicple of running a method with a long reaction times on a (non-segmented) FIA system is to 
1. increase the temperature, because the rule of thumb is that rates of reaction double approximately every 10 degrees.  For example, the phenolate ammonia method on the Lachat FIA runs a 600cm coil around a heater set at approximately 60 degrees, to accelerate colour development (whereas the same colour development takes 10 minutes at 37 degrees)
2. increase the reagent flow rates or decrease I.D of tubing, because in any flow situation there's a critical velocity where turbulence of the flowing solution overcomes diffuson, so the sample tends to 'self sweep' as it travels down the tube.
The biggest downside to FIA is the large reagent volumes that you burn through - much of which is basically wasted in the carrier used to separate out individual sample peaks.  
Related to this, the easiest way to improve analytical sensitivity is to increase the size of the sample loop (eg 10cm for high range, 400+cm for ultra-low range). This increases the residence time of the sample flowing past the detector and allows time integration (ie signal to noise comparison) that eliminates the effect of a lot of system noise.  This extremely long loop size decreases rate of analysis (since each sample might be passing the detector for 40+ seconds) and increases cost of analysis (since all the other reagents flow at a constant rate).
60.240.108.168 (talk) 12:40, 10 April 2009 (UTC)
thread_title:  Reducing peak diffusion in FIA 

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thread_title:  External links modified