1976
DOI: 10.3133/ofr76241
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Guidelines for collection and field analysis of ground-water samples for selected unstable constituents

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Cited by 125 publications
(109 citation statements)
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“…The samples were collected from springs, dug wells, production wells, and observation wells. Sampling and field measurements were carried out following standard procedures (Wood 1981). Some in situ tests such as temperature, pH, dissolved oxygen (DO), electrical conductivity (EC), and oxidation-reduction level (ORP) of the water samples were measured in the field with minimal atmospheric contact and by using a portable meter (WM-32EP, TOA DKK Inc).…”
Section: Sampling and Methodologymentioning
confidence: 99%
“…The samples were collected from springs, dug wells, production wells, and observation wells. Sampling and field measurements were carried out following standard procedures (Wood 1981). Some in situ tests such as temperature, pH, dissolved oxygen (DO), electrical conductivity (EC), and oxidation-reduction level (ORP) of the water samples were measured in the field with minimal atmospheric contact and by using a portable meter (WM-32EP, TOA DKK Inc).…”
Section: Sampling and Methodologymentioning
confidence: 99%
“…As amostras que apresentaram baixos valores de E H sugerem um nível elevado de estagnação e anaerobiose, caracterizando-se assim um ambiente fortemente impactado por poluição, especialmente de origem orgânica, desde a região metropolitana até a entrada do Reservatório de Barra Bonita. Os valores constantes de E H obtidos para a maioria das amostras podem ser explicados segundo o critério de Wood, 23 que considera que amostras muito contaminadas podem apresentar certa resistência a mudanças no valor de seu potencial redox, propriedade semelhante à capacidade tampão de um sistema. Isto ocorre principalmente devido à formação de FeS amorfo nas camadas superiores do sedimento, impedindo assim a livre difusão de O 2 na amostra.…”
Section: Resultados E Discussão Medições De Ph E Potencial Redox (E H )unclassified
“…These sampling times were chosen because they typically follow the annual period of pesticide application. Water samples were collected at the wellhead by using procedures described by Wood (1976), in which the wells were purged to three equivalent casing volumes, and temperature, pH, dissolved-oxygen concentration, and specific conductance were allowed to stabilize before a sample was collected. Teflon tubing was used to run the water from the sampling port of the well to the sample-collection bottle.…”
Section: Sample Collection and Processingmentioning
confidence: 99%