Metodología para el estudio de la contaminación por pesticidas en la zona no saturada y el acuifero de Gran Canaria y Tenerife (Islas Canarias)

• M.C. Cabrera ^[2] ; R. Muñoz ^[1] ; R. Poncela ^[3] ; A.R. Socorro ^[1] ; G. González ^[1] ; F. Hernández ^[4]
  1. [1] Instituto Canario de Investigaciones Agrarias

     Instituto Canario de Investigaciones Agrarias

     San Cristóbal de La Laguna, España

     
  2. [2] Departamento de Física-Geología. Facultad de Ciencias del Mar, ULPGC. Campus Universitario de Tafira. 35017 - Las Palmas de Gran Canaria. España.
  3. [3] Consultor independiente. Avda. Principal de Añaza, 25-C, 3º B 38109-Sta. Cruz de Tenerife.
  4. [4] Unidad de Química Analítica, Dto. de Ciencias experimentales, Universidad Jaume l. Campus Borriol, Apdo. 224, 12080 Castellón.

  Mostrar afiliaciones +
• Localización: Geogaceta, ISSN 0213-683X, Nº. 20, 6 (Comunicaciones presentadas en el IV Congreso Nacional de Geología, Alcalá de Henares, 1996), 1996, págs. 1288-1290
• Idioma: español
• Títulos paralelos:
  • Methodology for the study of the unsaturated zone and aquifer pesticides pollution in Gran Canaria and Tenerife (Canary lslands)
• Enlaces
  • Texto completo (pdf)
• Resumen

  • Two pesticides and their transformation products were selected far analytical and sampling work at two agricultural areas in the Canary Jslands: glyphosate and AMPA in a banana plantation in Valle Guerra (Tenerife), and metribuzin, MDADK, MOA y MDK in a tomato greenhouse in La Aldea (Gran Canaria). Three methods far sampling the unsaturated zone were compared: soil chemical extraction, the soil solution by means of suction cups and soil solution obtained by centrifugation. The comparison of the three methods shows that soil extracts give a higher pesticide content in the soil, corresponding to the adsorbed and soluble farms of the pesticide. Results far the suction cup samples are difficult to explain due to interactions between adsorption properties of the ceramic cups, amount of pesticide present in the soil solution and "mobile" and "immobile" fractions of- the soil water captured by the devices. Evidence of pesticide pollution in groundwater has been faund at the two studied areas, reaching 13.5 µg.J-1 in groundwater in La Aldea. With the available data, it is not possible to correlate the pesticide applications at the experimental fields with the groundwater concentrations in the two research areas. Hydrogeological studies at these areas show that groundwater represents a mixing between water from the aquifer with irrigation returns, not only from the experimental fields but from all the area.