1 Inorganic Geochemistry, British Geological Survey, Nottingham, UK. mwatts@bgs.ac.uk.
2 School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou, China.
3 Department of Geology and Geoenvironment, National and Kapodistrian University of Athens, Athens, Greece.
4 Department of Earth Science, Faculty of Earth and Environmental Sciences, University for Development Studies, Tamale, Ghana.
5 SEGH, British Geological Survey, Nottingham, UK.
6 University British Columbia, Kalowna, Canada.
7 Engineering and Environment, Northumbria University, Newcastle upon Tyne, UK.
8 University of Texas at Dallas, Richardson, USA.
9 Gibson Consulting and Training, Tarporley, UK.
10 Inorganic Geochemistry, British Geological Survey, Nottingham, UK.
11 Jinan University, Guangzhou, China.
12 University of the West of Scotland, Blantyre, UK.
13 Departamento de Ciências da Terra, Escola de Ciências, Universidade do Minho, Campus de Gualtarl, Braga, Portugal.
14 Copperbelt University, Kitwe, Zambia.
15 International Agency for Research Cancer, WHO, Lyon, France.
16 Instituto ed Geofísica, Universidad Nacional Autónoma de México, Mexico City, Mexico.
17 Islamic Azad University of Ahvaz, Ahvaz, Iran.
18 Department of Geology, University of Ibadan, Ibadan, Nigeria.
19 Department of Environmental Biology and Health, School of Environmental Studies, University of Eldoret, Eldoret, Kenya.
20 Manchester Metropolitan University, Manchester, UK.
21 SpringerNature, New York, USA.
22 University of Exeter, Exeter, UK.
23 Geology Department, Faculty of Science, Arish University, Arish, Egypt.
24 University of Strathclyde, Glasgow, UK.
25 Southern University of Science and Technology, Shenzhen, China.
26 Toho University, Funabashi, Japan.
27 NASA Astrobiology Institute, Mountain View, USA.
28 National University of Ireland, Galway, Ireland.
29 Fauji Fertiliser Company Ltd, Rawalpindi, Pakistan.