Biscayne aquifer

Humic substances are from terrestrial sources in overlying soils. Humic substances in the Biscayne aquifer are quite similar to those in surface water in elemental analysis, carbohydrate content, color, molecular weight, C/... 

Kohout F (1960) Cyclic flow of salt water in the Biscayne aquifer of southeastern Florida. Journal of Geophysical Research 65 2133-2141. 

The immunoassay also was examined for interference by naturally occurring humic and fulvic acids (14), which account for the majority of dissolved organic carbon in natural waters (15). Atrazine was measured in water samples that contained from 5 to 100 mg/L of humic and fulvic acid from the Suwannee River (standard-reference surface-water sample) (16) and humic and fulvic acids from Biscayne aquifer near Miami, Florida (17). For all samples, there was no difference between the immunoassay response in the presence and absence of the humic material. These data indicate... 

Humic substances from groundwater are considerably less colored per unit of carbon than humic substances from surface water their absorbance at 465 nm (a wavelength commonly used for color in Standard Methods, 1971) is 3-10 times less than the absorbance of humic substances from surface water. Table 6 compares absorbances of humic substances from groundwater with absorbances of humic substances from surface water. Absorbances of samples from the Red River, St. Peters, and Laramie-Fox Hills aquifers are considerably less than absorbances of humic substances from an average surface water. Only the Madison and the Biscayne samples are similar in color to humic substances from surface water. The Biscayne is... 

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