Abstract:
:South Africa is the largest user of pesticides in sub-Saharan Africa and many studies have highlighted the occurrence of pesticides in water resources. Poor management of water treatment facilities in combination with a relatively high dependency on untreated water from boreholes and rivers creates the potential for exposure of human communities to pesticides and their associated health effects. Pesticide use, physicochemical and toxicity data was therefore used to prioritize pesticides in terms of their potential risk to human health. After eliminating pesticides used in very low quantities, four indices were used to prioritize active ingredients applied in excess of 1000 kg per annum; the quantity index (QI) which ranked pesticides in terms of the quantity of their use; the toxicity potential index (TP) which ranked pesticides according to scores derived for their potential to cause five health effects (endocrine disruption, carcinogenicity, teratogenicity, mutagenicity and neurotoxicity); hazard potential index (HP) which multiplied the TP by an exposure potential score determined by the GUS index for each pesticide (to provide an indication of environmental hazard); and weighted hazard potential (WHP), which multiplied the HP for a pesticide by the ratio of its use to the total use of all pesticides in the country. The top 25 pesticides occurring in each of these indices were identified as priority pesticides, resulting in a combined total of 69 priority pesticides. A principal component analysis identified the indices that were most important in determining why a specific pesticide was included in the final priority list. As crop specific application pesticide use data was available it was possible to identify crops to which priority pesticides were applied to. Furthermore it was possible to prioritize crops in terms of the specific pesticide applied to the crop (by expressing the WHP as a ratio of the total amount of pesticide applied to the crop to the total use of all pesticides applied in the country). This allows for an improved spatial assessment of the use of priority pesticides. The methodology applied here provides a first level of basic, important information that can be used to develop monitoring programmes, identify priority areas for management interventions and to investigate optimal mitigation strategies.
journal_name
Environ Intjournal_title
Environment internationalauthors
Dabrowski JM,Shadung JM,Wepener Vdoi
10.1016/j.envint.2013.10.001subject
Has Abstractpub_date
2014-01-01 00:00:00pages
31-40eissn
0160-4120issn
1873-6750pii
S0160-4120(13)00216-Xjournal_volume
62pub_type
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pub_type: 杂志文章,meta分析,多中心研究
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journal_title:Environment international
pub_type: 杂志文章
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journal_title:Environment international
pub_type: 杂志文章
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journal_title:Environment international
pub_type: 杂志文章
doi:10.1016/j.envint.2008.04.003
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pub_type: 杂志文章
doi:10.1016/j.envint.2012.06.005
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pub_type: 杂志文章
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