scholarly journals ANÁLISE DE RISCO DE CONTAMINAÇÃO DAS ÁGUAS SUBTERRÂNEAS E SUPERFICIAIS DA REGIÃO DE PETROLINA (PE) E JUAZEIRO (BA)

Author(s):  
VERA L. FERRACINI ◽  
MARIA C. Y. P. PESSOA ◽  
ADERALDO S. SILVA ◽  
CLÁUDIO A. SPADOTTO

Analisou-se o potencial de contaminação das águas subterrâneas e superficiais do Submédio do Rio São Francisco por pesticidas aplicados nas culturas de manga e uva, mediante critérios da Environmental Protection Agency, do índice de GUS e critérios propostos por GOSS. Todos os critérios utilizados levam em consideração as propriedades dos produtos aplicados, não demandando custos elevados nem muito tempo para o levantamento das informações e para a avaliação do potencial de contaminação. Os resultados obtidos reforçam a importância de disponibilizar informações sobre as propriedades físico-químicas dos pesticidas, principalmente o coeficiente de adsorção, cujo valor permite a previsão da mobilidade do composto no solo. Este fator, integrado ao conhecimento do tempo de degradação do produto até a metade de sua concentração inicial (meia-vida) no solo, fornece informações sobre a sua influência no potencial de contaminação das águas. Os resultados deste trabalho propiciam o conhecimento dos pesticidas com maior potencial de contaminação dos recursos hídricos, os quais devem ser priorizados no monitoramento ambiental “in loco”. GROUND AND SURFACE WATER OF THE REGIONS PETROLINA (PE) AND JUAZEIRO (BA) Abstract The contamination potential of ground water and surface water in the sub-middle portion of San Francisco river basin was analyzed for pesticides applied in mango and grape cultivation by following the criteria of Environmental Protection Agency and to the index of GUS and criteria proposed by GOSS. All the criteria used take into consideration the applied products properties, by not demanding high costs nor a long time for rising information and evaluating contamination potential. The results obtained reinforce the importance of information publication on the physicochemical properties of pesticides, especially data on adsorption coefficient, whose values allow to predict the pesticide mobility in soils. This factor combined with the pesticide degradation time to the half of its initial concentration (half life) in the soil, provides information on pesticide water contamination potential. The results of this work allow the identification of the pesticides with higher contamination potential to water resources, which should be prioritized in environmental monitoring “in loco”.

2020 ◽  
Vol 83 (2) ◽  
pp. 249-255
Author(s):  
ACHYUT ADHIKARI ◽  
VIJAY SINGH CHHETRI ◽  
ANDREA CAMAS

ABSTRACT The Food Safety Modernization Act Produce Safety Rule requires covered produce growers to monitor the quality of their agricultural water on a regular basis by some U.S. Environmental Protection Agency (EPA)–approved methods recognized by the U.S. Food and Drug Administration. In this study, we evaluated the changes in the population of indicator organisms in surface water up to 6 months, and the effects of water source and holding temperature on the survival of indicator organisms by seven EPA-approved methods (five methods for Escherichia coli and two methods for Enterococcus). The levels of E. coli and Enterococcus in the surface water were variable with sampling month, ranging from 1.61 ± 0.04 to 2.68 ± 0.15 log most probable number (MPN)/100 mL and from undetectable level to 1.19 ± 0.29 log MPN/100 mL, respectively. At 25°C (holding temperature), there were significant reductions (P < 0.05) in E. coli and Enterococcus populations in surface water after 48 and 24 h, respectively, whereas at 4°C, no significant changes in the bacterial populations were observed up to 48 h. Methods 1603, 1604, 1103.1, 10029, and Colilert showed a comparable sensitivity in quantifying E. coli, whereas method 1600 and Enterolert showed a variable sensitivity with the type of water. The results indicated that regular monitoring of agricultural water is essential to examine whether the microbial quality of water is appropriate for its intended use. Water samples should be maintained at 4°C to minimize the changes in microbial populations between sampling and testing. The comparison of the sensitivity of EPA methods for quantifying indicator organisms could provide growers with useful information for choosing the method for their water quality analysis. HIGHLIGHTS


2012 ◽  
Vol 6 (1) ◽  
pp. 130-146 ◽  
Author(s):  
Charles Griffiths ◽  
Heather Klemick ◽  
Matt Massey ◽  
Chris Moore ◽  
Steve Newbold ◽  
...  

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