The lower portion of Taquari River is influenced by compounds from anthropic activities causing concern about the drinking water supplied to cities in the region. The study objective was to investigate the presence of contaminants at drinking water abstraction sites, defining the mutagenic effects of these stressors as an ecosystem quality parameter and its possible effects on human health. Geographic Information System techniques were used to investigate sources of contamination and it was found that agricultural activities predominated with a few medium and high potential pollutant agricultural activities, besides a a soil area that was contaminated and undergoing an intervention process. Mutagenic effects were evaluated by Salmonella/microsome assay using TA98, TA97a, TA100, YG1041 and YG1042 strains in the presence and absence of metabolic activation (S9). Mutagenesis found in organic sediment extracts and surface water samples showed the prevalence of direct-acting mutagens at the drinking water abstraction sites. Taquari (Ta032, the sampling points were named according to the initial letters of the river (Ta), followed by the number of kilometers from the mouth) showed the highest mutagenic potency in sediment, while Ta063, at Bom Retiro do Sul, presented it in the water sample. In the Triunfo region (Ta011) there were significant responses in sediment and in water samples. The samples at General Câmara (Ta006) showed the least presence of contaminants. The Allium cepa test applied to sediments in natura showed significant micronucleus induction in Ta032 in accordance with the Salmonella/microssome assay. The test performed on Danio rerio embryos (FET) in the in natura water samples did not present significant responses. Chemical analyses of polycyclic aromatic hydrocarbons and metals already identified as chemical markers in the area indicated a small contribution to the mutagenic potency, calling attention to the fact that other direct-acting pollutants may be present at the drinking water abstraction sites.

塔夸里河的下游受到人类活动的影响，引起对该地区城市供水的担忧。研究目的是调查饮用水提取场所污染物的存在，将这些压力源的诱变作用定义为生态系统质量参数及其对人体健康的可能影响。地理信息系统技术用于调查污染源，结果发现，除了受到污染并正在进行干预的土壤区域以外，农业活动主要是一些中等和高潜在的污染物农业活动。沙门氏菌评估了致突变作用在存在和不存在新陈代谢激活的情况下，使用TA98，TA97a，TA100，YG1041和YG1042菌株进行微颗粒分析（S9）。在有机沉积物提取物和地表水样品中发现的诱变表明，在饮用水提取场所普遍存在直接作用的诱变剂。Taquari（Ta032，采样点是根据河流的首字母（Ta）命名的，然后是距河口的公里数），这表明沉积物中的诱变力最高，而南Bom Retiro do Sul的Ta063提出了诱变作用。在水样中。在Triunfo地区（Ta011），沉积物和水样中有明显的响应。Câmara（Ta006）的样品显示出的污染物最少。的洋葱测试应用到沉积物中NATURA沙门氏菌/微粒体试验显示，Ta032中具有明显的微核诱导作用。在自然水样品中对Danio rerio胚胎（FET）进行的测试未显示明显的反应。对已经在该地区确定为化学标记物的多环芳烃和金属的化学分析表明，其对致突变性的贡献很小，这引起了人们的注意，在取水现场可能还存在其他直接作用的污染物。