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INSTITUTO TECNOLÓGICO DE SONORA Cuerpo académico: Ambiente y Salud

INSTITUTO TECNOLÓGICO DE SONORA Cuerpo académico: Ambiente y Salud. Exposure assessment of pesticides, arsenic and lead in children from the Southern Sonora, Mexico. Dra. Ma. Mercedes Meza-Montenegro April 05, 2013. Background.

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INSTITUTO TECNOLÓGICO DE SONORA Cuerpo académico: Ambiente y Salud

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  1. INSTITUTO TECNOLÓGICO DE SONORACuerpo académico: Ambiente y Salud Exposure assessment of pesticides, arsenic and lead in children from the Southern Sonora, Mexico. Dra. Ma. Mercedes Meza-Montenegro April 05, 2013

  2. Background • The Yaqui and Mayo valleys could be considered “high risks areas” • Major economic activity is agriculture: grains and vegetable • Since 1950s there have been reports of heavy application of pesticides (lead and sodium arsenate) . • Reports of high incidence of lukemia in children and adults in this area. 266,673 ha Yaqui valley 129,514 ha Mayo valley

  3. En las aves se han encontrado hasta 25 ppm de insecticida En los grandes peces: 2 ppm En los peces pequeños: 0.5 ppm  En el agua: 0.000,003 ppm En el zooplancton: 0.04 ppm Pesticide characteristics •Persistent •Lipophilic • High mobility •Are incorporated into food chains (biomagnified)

  4. Effects of pesticides • •Acute effects • –Dermatitis • –Loss of consciousness • - Seizures • -Respiratory depression • -Death • •Chronic effects • –Neurological system • –Immunological system • –Cancer • –Genotoxicity • –Endocrine disruptor • - Reproductive system

  5. Environmental Mexican Legislation • Mexican Constitution (Art. 4) • Everyone has the right to the healty environment. •  Everyone has the right to access to drinking water for personal consumption and domestic: enough, healthy, acceptable quality. • The state must to ensure these rights and establish rules for equitable and sustainable use. •  Participation: federal, state, and everyone from the population. • 2. Ley General del Equilibrio Ecológico y Protección al Ambiente (LGEEPA). • Toda persona tiene derecho a vivir en un ambiente adecuado para su desarrollo, salud y bienestar. • 3. Official Mexican Norms (NOMs)

  6. Banned pesticides in México: DOF 3 de Enero 1991 Fuente: El Catálogo Oficial de Plaguicidas publicado por la Comisión Intersecretarial para el Control del Proceso y Uso de Plaguicidas, Fertilizantes y Sustancias Tóxicas. (CICOPLAFEST),1999.

  7. Previous studies in theYaqui Valley, Sonora (1990-1998) 1991, García Bañuelos, different ways for pesticides contamination in new born and neonatos residentes in Pueblo Yaqui: lindano, p,p’-DDE, p, p’-DDT, aldrin. 1998, Soto Alvarado reported POC in serum blood of children from the Yaqui Valley. 100 % of the samples had residues of p-p’DDT y p-p´DDE. 1998, Guillette et al compared two communities with different exposure to pesticides (agricultural vs foothills) founding differences in funtional abilities. 1990, Reyes-Blanco,detected for first time POCs (DDTs, aldrín, lindano, endrín…in human milk in Pueblo yaqui.

  8. García BML, MezaMMM (1991) Principales vias de contaminación por plaguicididas en neonatos-lactantes residentes en Pueblo Yaqui, Sonora, Mexico. Inst Tecnol Sonora ITSON-DIEP. 1:33-42 Guillete et al 1998. Environ Health Perspec 106:347-353

  9. FOMIX-CONACYT-SONORA PROJECT (2007-2009) First studies in environmental samples 2008, Flores-Casillas, Osorio-Rosas, Acuña-García analyzed soil and drinking water of 25 agricultural towns from the Yaqui and Mayo valley. Superficial soil:DDTs, endosulfán, lindano, aldrín, endrín y BHC. Water : trace residues of pp-DDE First biological studies in children residents from the Mayo and yaqui communities.

  10. 2008- SEMARNAT-INE-CONACYT Schockholm Convention 2004 started the Schockholm Convention: COPs Commitment of the agreement: Mexico must propose and establish the National Plan of Implementation (PNI). Goal: work on strategies to reduce or eliminate COPs • Including hot spots and vulnerable groups. • Are including Yaqui valley and …….indigenous communities

  11. Justification • Geographic distribution of COPs is not known and is scarce in Mexico. •  The human levels of COPs show the real concentration in the environmental which is absorbed for the human. • Evaluate the corporal levels of COPs: international agreement for reduction/elimination. • 12 industrial chemicals: aldrin, dieldrin, endrin, DDT, heptacloro, HCB, mirex, toxapheno, polichlorinated byphenyls Bejarano-González, 2004

  12. Banned pesticides in other countries: still used in Mexico.

  13. Materials and Methods Study sites Environmental sampling: 24 towns Biological sampling: 9 towns

  14. Environmental sampling: soil and water Tobarito Potam Pueblo Yaqui

  15. Study design • Cross section study • N=165 children (6-12 yrs old) • 10 children by town • Inclusion criteria: • 5 years living in the town • Drinking water from the well • Yaqui valley: six towns • Mayo valley: 3 towns

  16. Recruitment • Consent forms •  Questionnaires

  17. Biological sampling: blood and urine Urinary arsenic Lead and pesticides in blood

  18. Results Table 1. Pesticides used in yaqui and mayo valleys during 2007. Fuente: Rodríguez, 2009

  19. Table 2. Most frequent diseases in residents from the yaqui and mayo valley.

  20. Table 3. Blood Pb levels in chidren from the Yaqui and Mayo valleys Meza-Montenegro et al (2013). Arch. Environ Contamination and Toxicol 64:519-527

  21. Table 4 Urinary InAs levels in chidren from the Yaqui and Mayo valleys, Sonora, Mexico. Meza-Montenegro et al (2013). Arch. Environ Contamination and Toxicol 64:519-527

  22. Table 5. Serum levels of OCP in children from the Yaqui and Mayo valleys in Sonora, Mexico. Meza-Montenegro et al (2013). Arch. Environ Contamination and Toxicol 64:519-527

  23. Potam

  24. Demographics and socioeconomic status • 5782 residents • Major activities: agriculture, fishing and livestock. • School: 3 elementary, 1middle, • 1 high school. • Most residents are bilingual • Houses are of “carrizo y lodo” • Houses have no floor • Streets have no pavement • Average income/day = 5.5 Dls

  25. Potam: Arsenic levels in drinking water NOM-127-SSA1-1994 25 ppb of As Levels in Potam: 93.82 ppb of As

  26. Potam: study case of different contaminants Soil and water sampling sites for OCP.

  27. Organochlorine Pesticides levels in soils from Potam

  28. Organochlorine pesticides in blood in children from Potam.

  29. Study of pyretroids in Potam Soil water Cejudo, 2010

  30. Pyrethroids in urine from children

  31. Water: its essencial role in quality of life Microbiological data: september 2009-Jun 2010 • Drinking water is not chlorinated • Contaminated with fecal coliforms • (NMP 39.6% of drinking water samples) • According the Mexican Legislation NOM-127-SSA1-1994 • The water quality for human consumption in Potam no met Mexican Standards. Well photo Félix-Fuentes et al. 2010

  32. Study of Cryptosporidiun parvum and Giardia intestinalis in drinking water (sep 2009-sep 2010) • These parasites cause gastrointestinal diseases • Cryptosporidiosis and giardiasis in human and animals • 100% of drinking water samples were positives for ooquistes de Cryptosporiduim parvum and quistes of Giardia intestinalis. • Was found that 1/100 persons could have giardiasis and cryptosporidiosis by year. Balderrama-Carmona et al. 2011. IV International Congress of Sciences, Ats, and Humanities-Mexico.

  33. Helycobacter pylori study in Potam Gastritis and stomach cancer.  n= 200 adults latrine • Higher prevalence of H. pylori compared with other Latin countries (Chile, Costa Rica, Colombia,Honduras, Nicaragua). • Have no drainage system Greenberg et al 2011. The Lancet 378:507-514.

  34. Conclusion • pp DDE was present in 100% of the samples, followed by pp-DDT, lindane and in a much lower proportion, aldrin y endosulfan. • The variety of OCP detected was lower than the reported one decade ago and the levels were within the reported ones in previous studies (28-145 ppb). • In-blood lead level were below the ones established on the regulation. • Arsenic levels in urine were slightly higher compared with the reference value from other countries. • Potam’s water is not suitable for human consumption.

  35. Conclusion….. • Production and environmental release of OPCs violates the fundamental Human Rights: • Right to health. • Women and children’s rights; right to healthy food, free of pollutants and to an appropriate environment for human dignity and development. Governments are responsible for solving issues as the ones related to access to: 1. Environmental justice. 2. Compensation for harms to health and environment.

  36. Thank you!

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