|
|
The Iodine Group | |
|
Home | Orthoiodosupplementation | Body | Disease | Special | Overviews |
||
|
|
Bird
Evolution of [135]I from freshwater and its partitioning in simple aquatic microcosmsBird G A, Schwartz W J, Rosentreter J Science of the total environment. 1995,164:2, pp. 151-159 [abstract only]
"Our investigation quantifies iodine evolution from freshwater to the atmosphere. A factorial experimental design was employed in which the distribution of [131]I was determined after 7 days in microcosms containing either (1) water (untreated Winnipeg River water), (2) Chlorella in a nutrient solution, (3) water and sediment (aerobic), or (4) water, sediment and N[2] gas (anaerobic). The [131]I released from the microcosms to the atmosphere was retained by triethylenediamine (TEDA) impregnated charcoal traps. Evolution accounted for <0.5% of the total [131]I inventory and was in the order Chlorella > water > water and sediment > water, sediment and N[2] gas. Combining all treatments, the evolution coefficient had a geometric mean (G.M.) of 4.5×10[-5] day[-1] with a geometric standard deviation (G.S.D.) of 3.7. In the water treatment, 97% of the [131]I remained in solution, whereas 22% was algal-bound in the Chlorella treatment, and 80% and 7% were sediment-bound under aerobic and anaerobic conditions, respectively. A partition coefficient (K[d]) value of 163 l-kg[-1] dry weight (dry wt.) was obtained for the aerobic organic sediment, whereas a value of 3 l-kg[-1] dry wt. was obtained for the anaerobic microcosms. On the basis of our K[d] values, the water to sediment transfer rate for iodine in Canadian Shield lakes would have a G.M. of 0.002 day[-1] and G.S.D. of 7.8. We conclude that evolution of iodine generally constitutes only a minor component of losses from freshwater. Under aerobic conditions iodine is lost to the sediments, but under low oxygen conditions most of it remains in solution."
|
|
Home | Orthoiodosupplementation | Body | Disease | Special Topics | OverviewsThe Iodine Group | Books | Disclaimers | Contact Us | Search
|
||
