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A PORTABLE PHOTOCELL FLUOROMETER FOR DILUTION MEASUREMENTS IN NATURAL WATERS 1, 2
Author(s) -
Noble Vincent E.,
Ayers John C.
Publication year - 1961
Publication title -
limnology and oceanography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.7
H-Index - 197
eISSN - 1939-5590
pISSN - 0024-3590
DOI - 10.4319/lo.1961.6.4.0457
Subject(s) - fluorometer , dilution , environmental science , bay , tracer , indicator dilution , chemistry , analytical chemistry (journal) , chromatography , fluorescence , optics , geology , oceanography , physics , thermodynamics , medicine , radiology , cardiac output , nuclear physics , blood pressure
A portable fluorometer for use with a fluorescent dye tracer in field measurements of dilution rates in natural waters has been designed and tested. The unit is inexpensive, accurate. and reliable. It requires only a small amount of a–c power. The instrument has been used in a series of 24 measurements of the dilution rate in the surface waters of Little Traverse Bay, Lake Michigan. The dilution of a quantity of dye introduced into the Bay is given by: D ( T ) = r t T/t where T is the time in minutes, and t is a quantity expressing the dilution period of interest. The average value for the observed dilution ratio, under winds up to 10–12 mph, is ( r 10 ) av = 2 ( i.e., an average dilution of x2 every 10 min) .