Chapter 19 Hafnium [Hf, 72] .............................................................................. 137

19.1 Introduction ......................................................................... 137

19.2 Soils ..................................................................................... 137

19.3 Waters .................................................................................. 138

19.4 Air ........................................................................................ 138

19.5 Plants ................................................................................... 139

19.6 Humans ................................................................................ 139

Chapter 20 Indium [In, 49] ................................................................................. 141

20.1 Introduction ......................................................................... 141

20.2 Soils ..................................................................................... 141

20.3 Waters .................................................................................. 142

20.4 Air ........................................................................................ 143

20.5 Plants ................................................................................... 143

20.6 Humans ................................................................................ 143

Chapter 21 Iodine [I, 53]..................................................................................... 145

21.1 Introduction ......................................................................... 145

21.2 Soils ..................................................................................... 146

21.3 Waters .................................................................................. 147

21.4 Air ........................................................................................ 148

21.5 Plants ................................................................................... 148

21.6 Humans ................................................................................ 149

21.7 Animals ............................................................................... 152

Chapter 22 Iridium [Ir, 77] ................................................................................. 153

22.1 Introduction ......................................................................... 153

22.2 Environment ........................................................................ 153

22.3 Humans ................................................................................ 154

Chapter 23 Iron [Fe, 26] ...................................................................................... 155

23.1 Introduction ......................................................................... 155

23.2 Soils ..................................................................................... 156

23.3 Waters .................................................................................. 158

23.4 Air ........................................................................................ 159

23.5 Plants ................................................................................... 160

23.6 Humans ................................................................................ 162

23.7 Animals ............................................................................... 164

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