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  "agreement": "true",
            
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  "alternative_identifier": "DOI: 10.4314/wsa.v39i2.18",
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  "alternative_identifier": "DOI: 10.4314/wsa.v39i2.18",
            
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  "author": null,
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  "author": null,
            
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  "author_email": null,
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  "authors": [
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  "authors": [
            
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    {
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    {
            
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      "author_department": "Department of Geology, Unit for 
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      "author_department": "Department of Geology, Unit for 
            
9
Environmental Sciences and Management",
9
Environmental Sciences and Management",
            
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      "author_email": "jan.huizenga@nwu.ac.za",
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      "author_email": "jan.huizenga@nwu.ac.za",
            
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      "author_name": "Jan Marten",
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      "author_name": "Jan Marten",
            
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      "author_organization": "North\u2011West University",
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      "author_organization": "North\u2011West University",
            
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      "author_surname": "Huizenga",
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      "author_surname": "Huizenga",
            
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      "contact_same_as_author": "true"
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      "contact_same_as_author": "true"
            
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    }
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    }
            
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  ],
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  ],
            
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  "citation_title": "HUIZENGA JM, SILBERBAUER M, DENNIS R and DENNIS I 
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  "citation_title": "HUIZENGA JM, SILBERBAUER M, DENNIS R and DENNIS I 
            
18
(2013) An inorganic water chemistry dataset (1972\u20132011) of 
18
(2013) An inorganic water chemistry dataset (1972\u20132011) of 
            
19
rivers, dams and lakes in South Africa. Water SA 39 (2) 335\u2013340. 
19
rivers, dams and lakes in South Africa. Water SA 39 (2) 335\u2013340. 
            
20
http://doi.org/10.4314/wsa.v39i2.18",
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http://doi.org/10.4314/wsa.v39i2.18",
            
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  "contact_person": [
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  "contact_person": [
            
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    {
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    {
            
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      "contact_department": "Department of Geology, Unit for 
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      "contact_department": "Department of Geology, Unit for 
            
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Environmental Sciences and Management",
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Environmental Sciences and Management",
            
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      "contact_email": "jan.huizenga@nwu.ac.za",
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      "contact_email": "jan.huizenga@nwu.ac.za",
            
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      "contact_name": "Jan Marten",
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      "contact_name": "Jan Marten",
            
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      "contact_orgnization": "North\u2011West University"
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      "contact_orgnization": "North\u2011West University"
            
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    }
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    }
            
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  ],
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  ],
            
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  "creator_user_id": "bc28a33f-dc21-4795-a57f-da7cd1aa23ea",
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  "creator_user_id": "bc28a33f-dc21-4795-a57f-da7cd1aa23ea",
            
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  "data_classification": "time series",
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  "data_classification": "time series",
            
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  "data_collection_organization": "Department of Water Affairs / 
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  "data_collection_organization": "Department of Water Affairs / 
            
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CSIR",
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CSIR",
            
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  "data_structure_category": "structured",
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  "data_structure_category": "structured",
            
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  "dataset_language": "English",
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  "dataset_language": "English",
            
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  "dataset_license_url": 
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  "dataset_license_url": 
            
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"https://creativecommons.org/licenses/by-sa/4.0/",
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"https://creativecommons.org/licenses/by-sa/4.0/",
            
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  "did_author_or_contact_organization_collect_the_data": "false",
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  "did_author_or_contact_organization_collect_the_data": "false",
            
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  "email": "vanderLaanM@arc.agric.za",
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  "email": "vanderLaanM@arc.agric.za",
            
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  "extras": [
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  "extras": [
            
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    {
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    {
            
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      "key": "data_reference_date_from",
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      "key": "data_reference_date_from",
            
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      "value": "1972-01-01"
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      "value": "1972-01-01"
            
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    },
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    },
            
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    {
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    {
            
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      "key": "data_reference_date_to",
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      "key": "data_reference_date_to",
            
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      "value": "2011-12-31"
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      "value": "2011-12-31"
            
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    }
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    }
            
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  ],
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  "id": "46d71914-e4ac-4cf8-9bd8-4d0a430062dc",
            
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  "isopen": false,
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  "isopen": false,
            
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  "keywords": "national data set, inorganic water chemistry, surface 
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  "keywords": "national data set, inorganic water chemistry, surface 
            
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waters, rivers, dams, lakes, South Africa",
54
waters, rivers, dams, lakes, South Africa",
            
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  "license": "Open (Creative Commons)",
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  "license": "Open (Creative Commons)",
            
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  "license_id": null,
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  "license_id": null,
            
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  "license_title": null,
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  "license_title": null,
            
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  "maintainer": null,
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  "maintainer": null,
            
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  "maintainer_email": null,
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  "maintainer_email": null,
            
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  "metadata_created": "2026-02-28T11:43:37.389091",
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  "metadata_created": "2026-02-28T11:43:37.389091",
            
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  "metadata_modified": "2026-10-13T13:05:40.440803",
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  "metadata_modified": "2026-10-13T13:17:17.753958",
            
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  "minimum_maximum_extent": [
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  "minimum_maximum_extent": [
            
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    {
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    {
            
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      "maximum_vertical_extent": "3451",
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      "maximum_vertical_extent": "3451",
            
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      "minimum_vertical_extent": "0"
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      "minimum_vertical_extent": "0"
            
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    }
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  ],
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  "name": 
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  "name": 
            
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chemistry-dataset-1972-2011-of-rivers-dams-and-lakes-in-south-africa",
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chemistry-dataset-1972-2011-of-rivers-dams-and-lakes-in-south-africa",
            
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  "notes": "The dataset comprised a national collection of inorganic 
70
  "notes": "The dataset comprised a national collection of inorganic 
            
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surface\u2011water chemistry data for rivers, dams and lakes across 
71
surface\u2011water chemistry data for rivers, dams and lakes across 
            
72
South Africa. It contained more than 500\u202f000 complete chemical 
72
South Africa. It contained more than 500\u202f000 complete chemical 
            
73
analyses collected between 1972 and 2011 from over 2\u202f000 
73
analyses collected between 1972 and 2011 from over 2\u202f000 
            
74
monitoring stations operated under the South African National Chemical 
74
monitoring stations operated under the South African National Chemical 
            
75
Monitoring Programme. The dataset included measured concentrations of 
75
Monitoring Programme. The dataset included measured concentrations of 
            
76
major ions, pH, electrical conductivity, total alkalinity and total 
76
major ions, pH, electrical conductivity, total alkalinity and total 
            
77
dissolved solids, together with numerous calculated variables used to 
77
dissolved solids, together with numerous calculated variables used to 
            
78
assess analytical accuracy and water quality 
78
assess analytical accuracy and water quality 
            
79
characteristics.\r\n\r\nOriginal data were obtained from the 
79
characteristics.\r\n\r\nOriginal data were obtained from the 
            
80
Department of Water Affairs and the CSIR, after which the dataset was 
80
Department of Water Affairs and the CSIR, after which the dataset was 
            
81
extensively processed to remove incomplete analyses and to add derived 
81
extensively processed to remove incomplete analyses and to add derived 
            
82
parameters such as stoichiometric charge balance, ionic strength, 
82
parameters such as stoichiometric charge balance, ionic strength, 
            
83
calculated electrical conductivity, total dissolved solids, sodium 
83
calculated electrical conductivity, total dissolved solids, sodium 
            
84
adsorption ratio and other hydrochemical indicators. These processing 
84
adsorption ratio and other hydrochemical indicators. These processing 
            
85
steps improved internal consistency and usability for 
85
steps improved internal consistency and usability for 
            
86
hydrogeochemical, environmental and water\u2011quality 
86
hydrogeochemical, environmental and water\u2011quality 
            
87
studies.\r\n\r\nThe dataset was organised into user\u2011friendly 
87
studies.\r\n\r\nThe dataset was organised into user\u2011friendly 
            
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Excel spreadsheets and included supplementary files describing 
88
Excel spreadsheets and included supplementary files describing 
            
89
sampling locations, monitoring periods and station metadata. The 
89
sampling locations, monitoring periods and station metadata. The 
            
90
resulting dataset provided a long\u2011term baseline for assessing 
90
resulting dataset provided a long\u2011term baseline for assessing 
            
91
spatial and temporal trends in South African surface\u2011water 
91
spatial and temporal trends in South African surface\u2011water 
            
92
chemistry and supported research, water\u2011resource management and 
92
chemistry and supported research, water\u2011resource management and 
            
93
quality\u2011control improvements in laboratory analysis.",
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quality\u2011control improvements in laboratory analysis.",
            
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    "description": "The Department of Water and Sanitation is the 
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    "description": "The Department of Water and Sanitation is the 
            
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custodian of South Africa's water resources. It is primarily 
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custodian of South Africa's water resources. It is primarily 
            
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responsible for the formulation and implementation of policy governing 
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responsible for the formulation and implementation of policy governing 
            
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this sector.\r\n\r\nWhile striving to ensure that all South Africans 
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this sector.\r\n\r\nWhile striving to ensure that all South Africans 
            
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gain access to clean water and dignified sanitation, the department 
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gain access to clean water and dignified sanitation, the department 
            
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also promotes effective and efficient water resources management to 
104
also promotes effective and efficient water resources management to 
            
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ensure sustainable economic and social development.",
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ensure sustainable economic and social development.",
            
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  "publication_date": "2013-04-01",
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  "publication_date": "2013-04-01",
            
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  "publisher": "Water SA (published by the Water Research 
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  "publisher": "Water SA (published by the Water Research 
            
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Commission)",
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Commission)",
            
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