In this study, the hydrocarbons (HCs) levels in sediments from Lagoa Mirim, situated in the south of Brazil, were verified. The methodology brought together stages of pre-sonification, soxhlet extraction, and determination by gas chromatography coupled with mass spectrometry (GC/MS). Ten sample points were evaluated where ∑n-alkanes varied between 1.46 µg kg⁻¹ ± 4.0% and 10.10 µg kg⁻¹ ± 17.6%. Diagnostic indexes were calculated, being: Carbon Preferential Index (CPI), terrestrial/aquatic ratio (TAR), unresolved complex mixture (UCM), UCM/∑n-alkanes ratio, and n-alkane ratio with Low molecular weight hydrocarbon and High molecular weight hydrocarbons (HMW/LMW). In general, the results of this study indicate a low anthropogenic impact in the environment.

在这项研究中，验证了位于巴西南部的 Lagoa Mirim 沉积物中的碳氢化合物 (HC) 水平。该方法汇集了预超声、索氏提取和气相色谱与质谱联用 (GC/MS) 测定的各个阶段。评估了 10 个样品点，其中 ∑ n -烷烃在 1.46 µg kg ^-1  ± 4.0% 和 10.10 µg kg ^-1  ± 17.6% 之间变化。计算诊断指标，为：碳优先指数 (CPI)、陆地/水生比率 (TAR)、未解析的复杂混合物 (UCM)、UCM/∑ n -烷烃比率和n-烷烃与低分子量烃和高分子量烃的比率 (HMW/LMW)。总的来说，这项研究的结果表明，人为对环境的影响很小。