Iodine and human health, the role of environmental geochemistry and diet, a review

Fuge, R.; Johnson, Christopher C.

doi:10.1016/j.apgeochem.2015.09.013

Cited by 278 publications

(221 citation statements)

References 252 publications

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“…The soluble iodine content of soils is usually <10% of the total iodine fixed in soil. The availability of soluble iodine is higher with a low oxidoreductive potential (Eh) (with I − as the dominant chemical form of iodine) and lower under oxidizing conditions (with

{IO}_{3}^{-}

as the most abundant form; Fuge and Johnson, 2015). …”

Section: Iodine Applications In Agricultural Cropsmentioning

confidence: 99%

“…Volatilization is dependent on both Eh and pH, with the lowest levels of volatilization in oxic alkaline soils, where the most abundant form of iodine is the non-volatile

{IO}_{3}^{-}

; in contrast, in waterlogged and organic soils occur higher rates of volatilization resulting from the predominance of I − that is oxidized to I 2 and CH 3 I. It has been suggested that in inland areas, the contribution of atmospheric iodine depends significantly on the volatilization of the iodine in the soil (Fuge and Johnson, 2015). …”

Section: Iodine Applications In Agricultural Cropsmentioning

confidence: 99%

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Use of Iodine to Biofortify and Promote Growth and Stress Tolerance in Crops

et al. 2016

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Iodine is not considered essential for land plants; however, in some aquatic plants, iodine plays a critical role in antioxidant metabolism. In humans, iodine is essential for the metabolism of the thyroid and for the development of cognitive abilities, and it is associated with lower risks of developing certain types of cancer. Therefore, great efforts are made to ensure the proper intake of iodine to the population, for example, the iodization of table salt. In the same way, as an alternative, the use of different iodine fertilization techniques to biofortify crops is considered an adequate iodine supply method. Hence, biofortification with iodine is an active area of research, with highly relevant results. The agricultural application of iodine to enhance growth, environmental adaptation, and stress tolerance in plants has not been well explored, although it may lead to the increased use of this element in agricultural practice and thus contribute to the biofortification of crops. This review systematically presents the results published on the application of iodine in agriculture, considering different environmental conditions and farming systems in various species and varying concentrations of the element, its chemical forms, and its application method. Some studies report beneficial effects of iodine, including better growth, and changes in the tolerance to stress and antioxidant capacity, while other studies report that the applications of iodine cause no response or even have adverse effects. We suggested different assumptions that attempt to explain these conflicting results, considering the possible interaction of iodine with other trace elements, as well as the different physicochemical and biogeochemical conditions that give rise to the distinct availability and the volatilization of the element.

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{IO}_{3}^{-}

as the most abundant form; Fuge and Johnson, 2015). …”

Section: Iodine Applications In Agricultural Cropsmentioning

confidence: 99%

“…Volatilization is dependent on both Eh and pH, with the lowest levels of volatilization in oxic alkaline soils, where the most abundant form of iodine is the non-volatile

{IO}_{3}^{-}

Section: Iodine Applications In Agricultural Cropsmentioning

confidence: 99%

Use of Iodine to Biofortify and Promote Growth and Stress Tolerance in Crops

et al. 2016

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“…The background concentrations of I in soil typically range from 0.1 to 100 mg kg −1 (Fuge 1996; Fuge and Johnson 2015), with a mean concentration of 5.1 mg kg −1 (Johnson, 2003). Concentrations in Northern Ireland, which is geographically similar to New Zealand, averaged 10.6 mg kg −1 (Smyth and Johnson, 2011).…”

mentioning

confidence: 99%

“…In contrast, seawater, which contains 0.06 mg I L −1 (Wright, 1995), is a major reservoir of the element in the biosphere, with seaspray and subsequent wet and dry deposition of volatilized I being important processes for supplying the element to soils. It follows that elevated I concentrations are often found in soils close to the sea (Fuge and Johnson, 2015; Medrano‐Macías et al, 2016). Johnson (2003) reported geometric means of 11.6 and 2.6 mg kg −1 <50 and >50 km from the sea, respectively.…”

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confidence: 99%

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Environmental Parameters Affecting the Concentration of Iodine in New Zealand Pasture

et al. 2019

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Iodine (I) is an essential trace element commonly deficient in agricultural systems. Whereas there is much information on I in food crops, there is a lacuna of knowledge on the environmental factors that affect pasture I concentrations. We aimed to identify the most important environmental factors affecting the concentration of I in New Zealand pastures, and the consequences to agricultural systems. Soil and pastoral samples were collected throughout the country and analyzed for I and other elements. The soils contained 1.1 to 86 mg I kg−1, with 0.005 to 1.4 mg kg−1 in the pasture. In 26% of pastures, I concentrations were insufficient for sheep nutrition, whereas 87% contained insufficient I for cattle nutrition. Pasture I concentrations were negatively correlated with the distance from the sea, and the concentration of oxalate‐extractable amorphous Al, Fe, and Si oxides, which immobilize soil I. Soil organic C and clay increased I retention in soil but did not significantly affect pasture I concentrations. Future work should investigate how soil properties affect pasture I uptake in inland areas. Core Ideas 87% of New Zealand pastures contained insufficient iodine for cattle. Pasture I levels are higher close to the sea. Pasture I levels are lower in soil that is high in Fe and Al (oxyhydr)oxides.

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