By Lic. Silvana Buján
Year after year, this last decade has seen these arguments crumble due to the emergence of overwhelming evidence of the health externalities associated with this way of producing in the field.
Millions of liters of herbicides (in particular Glyphosate -GLY- and Atrazine -ATZ-) are systematically sprayed on land, water, and even populations.
Restrictive laws have begun to drive sprays away from urban centers and schools, not always with success and not always with the awareness that the drifts of these substances are unpredictable.
The discourse of "good agricultural practices" not only omits these things, but in itself, they make it very clear that for more than 50 years the promoters of this model, did "bad agricultural practices" without even apologizing for it.
We can get people's apps to go away… but can we stop the rain? ALSO THE RAIN The Environmental Research Center (CIMA) that belongs to the Faculty of Exact Sciences of the National University of La Plata has produced, with the signature of Lucas Alonso, Alicia Ronco and Damián, a research work that shows that These substances also evaporate and then fall with the rains. In other words, pesticides are raining down. They point out (citing the work) that in the United States, maximum concentrations of 2.5 µg / L and 0.83 µg / L have been reported in the United States with annual applications of 2.75 tons of these agrochemical formulations.
Comparatively in Argentina, during the period 2012/13, around 245 tons of equivalent formulations were marketed, which motivates interest in the study of these compounds in the atmosphere and their possible reach to urbanized regions
. The objective of the work was to study the levels of GLY and ATZ in rainwater in urban and peri-urban population centers of the Pampean Region. To this end, rain events were sampled from October 2012 to April 2014 in: province of Bs. As. (N = 27), Córdoba (n = 36), Santa Fe (n = 35) and Entre Ríos ( n = 16).
The samples were over-aggregated at the sampling point with isotopic tracers of both analytes and transported with a cold chain to the laboratory.
Prior to their analysis, they were filtered by 0.45 µm and the soluble fraction was analyzed by HPLC-ESI-MS (SIM Mode, characteristic ions for each compound).
Glyphosate was the most detected herbicide with 90% positive results, a mean and a maximum regional concentrations of 6.5 µg / L and 67.3 µg / L, for ATZ in 79% of the cases with media- maximum of 1.5-15.7 µg / L and AMPA with 35% detection and mean-maximum of 0.8-7.9 µg / L. The provinces where the highest concentrations were detected were Córdoba, Santa Fe, Bs. And Entre Ríos.
These results are the first measured for Argentina and provide information regarding one of the atmospheric contributions in water basins and urban populations for this type of compounds. IS THAT A LOT OR LITTLE? A couple of substances have been analyzed here, but in real life hundreds of different base and formulations are used.
This means that we probably receive rain (that falls in the cisterns, water courses, roofs, people, etc.) cocktails of many things all together.
The old concept that "the dose makes the poison" (Paracelsus) does not work in these substances, since many of them are cumulative and because low but repeated doses produce irreversible effects. Substances produced by synthetic chemistry have a bad habit of being able to combine and synergize.
That is, molecules that were relatively innocuous alone, combined can be toxic.
And even to cause certain effects that are more intense at low doses than at high doses. In addition, these substances impact differently at various stages of development: their presence in the gestation period, or in a growing child, or in a developing adolescent generates disparate effects.
The same in an old man or a malnourished person. A person exposed to pesticides on a daily basis is more likely to get sick.
We have already shown that we carry them in our blood, that they are in vegetables, and now, the UNLP shows that they are in the rain.
It is not naive that: - This type of measurement has never been done before.
- That before this startling discovery, nothing appears in the Campo supplements of the big media.
- That no government health agency or laboratory of agricultural chemical corporations has made residuality measurements in blood.
- That no government health agency or laboratory of agricultural chemical corporations has made residuality measurements in vegetables.
- That there are never health representatives in the discussion tables for the adaptation of the norms that regulate these substances.
- That subacute and chronic effects have never been considered for the regulations governing them.
And several others "- What ..."
But yes,… also the rain.
BIOS - RENACE