Fluvial loads of pesticides in the Pisque river (Ecuador) between June 2018 and May 2019

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Published: Oct 5, 2023
Updated: 2023-10-05
Versions:
2023-10-05 (3)
DOI: https://doi.org/10.17163/lgr.n38.2023.07
Keywords:
Floriculture, passive SPMD and POCIS samplers, environmental degradation of pesticides

Main Article Content

Renato Sánchez Proaño
Universidad Politécnica Salesiana
http://orcid.org/0000-0002-5015-7570
Carlos Cerón Pánchig
Universidad Politécnica Salesiana
https://orcid.org/0000-0003-3968-3681
Karla Landeta Jibaja
Universidad Politécnica Salesiana
https://orcid.org/0000-0002-5996-7481

Abstract

The Pisque river basin in Ecuador has a high presence of the floricultural industry, hence the aim of the research is to estimate the losses of pesticides that enter the river water through sources such as surface runoff, contact with the ground, permeate of a previous runoff or by infiltration, and that can be measured in the final channel of the Pisque river before its mouth. In order to know the pesticides used, surveys have been carried out with flower producers. The measurements were made in the Granobles and Guachalá rivers, the two tributaries of the Pisque river; and at two separate points on the same river Pisque, one immediately after the conjunction between the two tributaries and a point before their mouth to the next river. The flow gauges were monthly from June 2018 to May 2019. As a sampling method, SPMD and POCIS passive devices were used during the three dry months, from June to August 2018. To obtain the retention rates of the passive devices, a calibration with the pesticides was carried out in the laboratory through a hydrodynamic channel. Twenty-four main active ingredients were identified from the surveys, mostly compounds with Type III and Type IV toxicities. According to the results of the model, the fluvial load of pesticides in surface waters was 2,982.24 Kg between the months of June 2018 to May 2019, with environmental degradation of various compounds along the stretch of the river.

Article Details

Issue
Vol. 38 No. 2: (September 2023-February 2024)
Section
Scientific Article
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