Các cư dân của ngôi làng của Tlamacazapa hiển thị ảnh hưởng sức khỏe độc hại liên quan đến thạch tín và các tiếp xúc kim loại khác từ nước giếng cạn. Asen là trong giai đoạn giải thể lên đến nồng độ 37 g / L, vượt quá hướng dẫn Tổ chức Y tế Thế giới 10 g / L. Phân tích đồng vị ổn định (2Hwater & 18Owater) | Natural Arsenic in Groundwater Occurrence Remediation and Management -Bundschuh Bhattacharya and Chandrasekharam eds 2005 Taylor Francis Group London ISBN 04 1536 700 X Arsenic source and fate at a village drinking water supply in Mexico and its relationship to sewage contamination . Cole . Ryan Department of Geology and Geophysics University of Calgary Calgary Alberta Canada S. Smith Caminamos Juntos para Salud y Desarrollo . Cuernavaca Morelos Mexico D. Bethune Department of Geology and Geophysics University of Calgary Calgary Alberta Canada ABSTRACT Inhabitants of the village of Tlamacazapa display toxic health effects related to arsenic and other metal exposures from shallow well water. Arsenic is present in the dissolved phase up to a concentration of 37 ig L exceeding the World Health Organization guideline of 10 ig L. Stable isotope analyses 2Hwater 18Owater indicate precipitation is recharging the wells through the soil and shallow groundwater. Soil and rock analyses show that arsenic is present at concentrations up to 56 mg kg and 26 mg kg respectively. High concentrations of Cl K Na NO3 and SO4 suggest sewage or manure contamination in the well water occurs via surface runoff into the unprotected wells or through the thin soil and shallow groundwater. Open air excretion and free-roaming animals are sources of this contamination. Arsenic and sewage contaminant concentrations are strongly correlated and the presence of sewage apparently promotes the release of arsenic from aquifer materials. It is likely that arsenic mobilization is the result of desorption associated with arsenate-phosphate competition for sorption sites. 1 INTRODUCTION Tlamacazapa Tlama is located in the Sierra Madre del Sur of the state of Guerrero roughly 160 km southwest of Mexico . and 10 km east of the historical silver-mining town of Taxco de Alarcón. It has a population of approximately 9000 living in high-density housing mixture of concrete housing and simple cornstalk
