Impacts on urban water resources are invariably caused by the development of urban centers and the occupation of the watershed. The release of untreated effluents and urban runoff are sources of metals in adjacent water bodies. It is therefore important to conduct studies on the occurrence of these trace elements in the environment and the risks posed to human health. The aim of the present study was to determine Cd, Pb, Cu, and Zn concentrations in water bodies located in the Bacanga and Cachorros watersheds and correlate the occurrence of these elements with physicochemical variables of the water (temperature, pH, dissolved oxygen, and electrical conductivity). The variables were determined at the collection site with the aid of a multiparameter kit. Heavy metal concentrations were determined using anodic stripping voltammetry. The results revealed that the streams were not contaminated with the metals analyzed. The only exception was copper in the Limoeiro and Murtura streams, both of which are located in the industrial complex.

中文翻译：

---

巴西圣路易斯Bacanga流域和Cachorros流域中重金属的评估。

对城市水资源的影响总是由城市中心的发展和流域的占用引起的。未经处理的污水的释放和城市径流是相邻水域中金属的来源。因此，重要的是要对环境中这些微量元素的发生以及对人类健康构成的风险进行研究。本研究的目的是确定位于Bacanga和Cachorros流域的水体中Cd，Pb，Cu和Zn的浓度，并将这些元素的出现与水的理化变量（温度，pH，溶解氧和电导率）。变量是在收集现场借助多参数工具包确定的。使用阳极溶出伏安法测定重金属浓度。结果表明，这些流没有被分析的金属污染。唯一的例外是Limoeiro和Murtura流中的铜，这两个流都位于工业园区内。