
TY  - JOUR
A1  - Deein, G. 
A1  - Thimdee, W. 
A1  - Matsunaga, K. 
T1  - Bioavailable colloidal iron in river water originated from the forest
JF  - Marine and Freshwater Research
JO  - Mar. Freshwater Res.
Y1  - 2002
VL  - 53
IS  - 1
SP  - 43
EP  - 47
KW  - bioavailable iron, stable carbon isotope, phytoplankton
UR  - https://doi.org/10.1071/MF00145 
N2  - In samples of water from five sites on the Shukunohe, Ohno and Kunebetsu rivers, Japan, most of the filterable iron (&#60;0.45 m) was colloidal iron (0.45&#8211;0.025 m). There was a correlation between dissolved iron and colloidal iron; both are assumed to be associated with humic substances, since the carbon isotope ratio of colloidal organic substances on glass-fibre filters corresponded to the ratio of mountain humic soil. In culture experiments, the freshwater phytoplankton Melosira granulata var. angustissima f. spiralis grew rapidly in a medium containing colloidal iron, to a maximum of ~250 000 cells mL&#8211;1. However, there was little growth with amorphous colloidal iron and no growth in control medium containing ~0.1 M dissolved Fe. In a multispecies phytoplankton culture, colloidal iron also promoted growth, with a maximum of ~60 g Chl-a L&#8211;1. These results indicated the bioavailability of colloidal iron. 
ER  -

