Abstract：
The pH of Mount Ijen crater water is 0-2, resulting in water that is acidic and sulfurous. A fault near the Mount Ijen Crater causes seepage so that acidic water flows into the Banyupait River. Chemical elements and heavy metals originating from the river pollute groundwater and plants. As a result, people around the river consume heavy metals. This research aims to determine the quality of river water and groundwater, as well as determine community factors that are susceptible to dental fluorosis. The methodology used is field mapping and laboratory analysis. For water samples, the Atomic Absorption Spectrophotometer (AAS) method is used. The pH of river water at the research location exceeds the quality standard, namely pH 4-5.5. Meanwhile, groundwater fluorine and sulfate elements exceed quality standards, namely fluorine of 0.6171 mg/L and 0.6870 mg/L, and sulfate ranging from 325-683 mg/L. These two elements cause symptoms of dental fluorosis. Meanwhile, the community factors most susceptible to dental fluorosis are people in the adult age category, and the last level of education is elementary school. This is because the Banyupait River water and groundwater are exposed to fluorine and sulfate water originating from seepage from the Mount Ijen Crater.
摘要：
Ijen火山口水的pH值为0-2，导致水呈酸性和含硫。Ijen火山口附近的断层会导致渗漏，因此酸性水流入Banyupait河。源自河流的化学元素和重金属污染地下水和植物。因此,河流周围的人消耗重金属。这项研究旨在确定河水和地下水的质量，以及确定易患氟斑牙的社区因素。使用的方法是现场制图和实验室分析。对于水样，采用原子吸收分光光度计(AAS)法。研究地点河水pH值超过质量标准,即pH4-5.5。同时,地下水氟和硫酸盐元素超过质量标准，即0.6171mg/L和0.6870mg/L的氟，和硫酸盐的范围为325-683mg/L。这两种因素会导致氟斑牙的症状。同时,最易患氟斑牙的社区因素是成年人，最后一级教育是小学。这是因为Banyupait河水和地下水暴露于源自Ijen火山口渗漏的氟和硫酸盐水。
