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The FL24 or FL30 sondes can separate 3 different tracers selected in 5 classes I to V. Tracers from the same class cannot be separated (Uranine-Eosine: can't be separated). Standard setup comprises optics of Class I, II and III. On request, they can be replaced by Classes IV and/or V.
The FL22 sonde is equipped with one optics of Class I, also convenient for detection of Class II tracers.

Dye tracer table
Legend:  +++ very good     ++ good    + fair   - not advisable

Class Name Detection limit with the GGUN
Sorption in porous media Bleaching by daylight Quantum yield with acidic pH Environment friendly
Price
V Sodium naphtionate + ++ ++ ++ ++ ++
III Tinopal (CBS-X or -CL) +++ - - - ++ +++
III Amino G acid ++ ? ? + ++ +
III Photine + - - ? ? -
IV Duasyne  yellow T +++ ++ ? ? ? ++
I Pyranine + - ? + + -
I Uranine (Na fluorescein) +++ +++ - - +++ +++
I Eosine + ++ - + + ++
II Amidorhodamine G + + +++ +++ + -
II Rhodamine WT ++ + +++ +++ - -
II Sulforhodamine B ++ + +++ +++ - -

Source:
Utilisation des traceurs artificiels en hydrogéologie - Guide pratique
Groupe de travail Traçage de la Société suisse d’hydrogéologie SSH
Berichte des BWG, Serie Geologie - Rapports de l’OFEG, Série Géologie - Rapporti dell’ UFAEG, Serie Geologia
No 3 - Bern, 2002

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