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  "agreement": "true",
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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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  "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 
            
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Environmental Sciences and Management",
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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_reference_date": [
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  "data_reference_date": [
            
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    {
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    {
            
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      "data_reference_date_from": "1972-01-01",
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      "data_reference_date_from": "1972-01-01",
            
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      "data_reference_date_to": "2011-12-31"
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      "data_reference_date_to": "2011-12-31"
            
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    }
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    }
            
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  ],
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  ],
            
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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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  "groups": [],
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  "groups": [],
            
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  "id": "46d71914-e4ac-4cf8-9bd8-4d0a430062dc",
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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",
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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": "2026-04-01T13:27:22.443526",
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  "metadata_modified": "2026-04-03T10:47:19.320228",
            
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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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  ],
            
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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 
66
  "notes": "The dataset comprised a national collection of inorganic 
            
67
surface\u2011water chemistry data for rivers, dams and lakes across 
67
surface\u2011water chemistry data for rivers, dams and lakes across 
            
68
South Africa. It contained more than 500\u202f000 complete chemical 
68
South Africa. It contained more than 500\u202f000 complete chemical 
            
69
analyses collected between 1972 and 2011 from over 2\u202f000 
69
analyses collected between 1972 and 2011 from over 2\u202f000 
            
70
monitoring stations operated under the South African National Chemical 
70
monitoring stations operated under the South African National Chemical 
            
71
Monitoring Programme. The dataset included measured concentrations of 
71
Monitoring Programme. The dataset included measured concentrations of 
            
72
major ions, pH, electrical conductivity, total alkalinity and total 
72
major ions, pH, electrical conductivity, total alkalinity and total 
            
73
dissolved solids, together with numerous calculated variables used to 
73
dissolved solids, together with numerous calculated variables used to 
            
74
assess analytical accuracy and water quality 
74
assess analytical accuracy and water quality 
            
75
characteristics.\r\n\r\nOriginal data were obtained from the 
75
characteristics.\r\n\r\nOriginal data were obtained from the 
            
76
Department of Water Affairs and the CSIR, after which the dataset was 
76
Department of Water Affairs and the CSIR, after which the dataset was 
            
77
extensively processed to remove incomplete analyses and to add derived 
77
extensively processed to remove incomplete analyses and to add derived 
            
78
parameters such as stoichiometric charge balance, ionic strength, 
78
parameters such as stoichiometric charge balance, ionic strength, 
            
79
calculated electrical conductivity, total dissolved solids, sodium 
79
calculated electrical conductivity, total dissolved solids, sodium 
            
80
adsorption ratio and other hydrochemical indicators. These processing 
80
adsorption ratio and other hydrochemical indicators. These processing 
            
81
steps improved internal consistency and usability for 
81
steps improved internal consistency and usability for 
            
82
hydrogeochemical, environmental and water\u2011quality 
82
hydrogeochemical, environmental and water\u2011quality 
            
83
studies.\r\n\r\nThe dataset was organised into user\u2011friendly 
83
studies.\r\n\r\nThe dataset was organised into user\u2011friendly 
            
84
Excel spreadsheets and included supplementary files describing 
84
Excel spreadsheets and included supplementary files describing 
            
85
sampling locations, monitoring periods and station metadata. The 
85
sampling locations, monitoring periods and station metadata. The 
            
86
resulting dataset provided a long\u2011term baseline for assessing 
86
resulting dataset provided a long\u2011term baseline for assessing 
            
87
spatial and temporal trends in South African surface\u2011water 
87
spatial and temporal trends in South African surface\u2011water 
            
88
chemistry and supported research, water\u2011resource management and 
88
chemistry and supported research, water\u2011resource management and 
            
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quality\u2011control improvements in laboratory analysis.",
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quality\u2011control improvements in laboratory analysis.",
            
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  "num_resources": 8,
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  "num_tags": 0,
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  "organization": {
            
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    "approval_status": "approved",
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    "created": "2025-12-03T12:47:25.898887",
            
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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 
100
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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