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Journal Articles

Determination of total iodine concentration in aquatic environments using cathodic stripping voltammetry combined with sodium hypochlorite (NaClO) oxidation

Sato, Yuhi; Otosaka, Shigeyoshi; Suzuki, Takashi

Journal of Water and Environment Technology (Internet), 12(2), p.201 - 210, 2014/04

https://doi.org/10.2965/jwet.2014.201

An easy and fast method for determination of total iodine in environmental samples by cathodic stripping voltammetry combined with NaClO oxidation has been developed. Adequate conditions for NaClO oxidation of 40-50$$^{circ}$$C over 2 h were determined, using three representative environmental samples (reference soil, seabed sediment, seaweed). By analyzing a mixture of thyroxin and a reference soil material, we obtained an overall recovery of more than 97% for total iodine in the concentration range of 1-7 $$mu$$mol g$$^{-1}$$. This method was compared with alkaline extraction and combustion methods for solid and aqueous environmental samples. Alkaline extraction exhibited lower recovery of iodine compared with the NaClO oxidation method, indicating insufficient extraction and/or interference on determination. Combustion method also showed lower iodine recovery for some samples, probably due to a trapping efficiency and incomplete combustion of organic matter.

Journal Articles

Isotope hydrograph separation for modeling of runoff mechanisms of atmospherically derived chemical and radioactive pollutants

Matsunaga, Takeshi; Yanase, Nobuyuki; Hanzawa, Yukiko; Tsuzuki, Katsunori; Naganawa, Hirochika

Journal of Water and Environment Technology (Internet), 3(2), p.243 - 252, 2005/00

https://doi.org/10.2965/jwet.2005.243

In a tributary watershed of the Kuji River of Japan, the hydrological components of runoff associated with a rain storm event were investigated using isotope tracers of hydrogen ($$^{2}$$H) and oxygen ($$^{18}$$O) in precipitations and stream water. The runoff was separated into either "old water" (pre-existing in the ground before the storm) and "new water"(from the storm precipitation). It was found that the discharge of several hazardous trace elements (Sb, Cu, Cr) was largely (24-54%) attributable to that of the new water in spite of its small contribution to the total water discharge. These investigations suggest that the new water may play an important role in the migration of atmospherically derived, hazardous trace elements to streams during rain storms.

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