Federal Rural University of Rio de Janeiro (Universidade Federal Rural do Rio de Janeiro - UFRRJ), Seropédica, RJ, Brazil.
Mato Grosso State University (Universidade do Estado de Mato Grosso), Tangará da Serra, MT, Brazil.
Environ Monit Assess. 2018 Mar 17;190(4):228. doi: 10.1007/s10661-018-6566-x.
The petroleum industry generates a range of wastes which is often are disposed in soil close to the well location, negatively affecting soil and water quality. The objective of this study was to evaluate the solubility and map the spatial variability of barium in a potentially contaminated area. The study area consisted of a petroleum well-drilling waste disposal site located in the municipality of Mato Rico-PR. A large georeferenced sampling grid was organized. Soil samples were collected at depths of 30, 60, 90, and 120 cm for determination of the "pseudo-total" concentrations and geochemical fractionation of barium. The barium concentrations showed spatial dependence, which permitted the use of geostatistical interpolators. Regarding depth, the depth of 0-30 cm showed the largest contaminated area; however, higher concentrations of barium were found at the depth of 60-90 cm. The results of geochemical fractionation showed that the analyzed samples contained percentages higher than 99% in the non-labile fraction (residual). These results indicate clearly that the barium was in a condition of low solubility, even for samples that had the highest concentrations, presenting low-environmental risk.
石油工业产生的一系列废物通常被处置在靠近井位的土壤中，这对土壤和水质产生了负面影响。本研究的目的是评估钡在一个潜在污染地区的溶解度，并绘制其空间变异性的图谱。研究区域由位于马托里科市-PR 的石油钻井废物处置场组成。组织了一个大型地理参考采样网格。采集了深度为 30、60、90 和 120 厘米的土壤样本，以测定“总假浓度”和钡的地球化学分馏。钡浓度显示出空间依赖性，允许使用地质统计插值器。关于深度，0-30 厘米的深度显示出最大的污染区域；然而，在 60-90 厘米的深度发现了更高浓度的钡。地球化学分馏的结果表明，分析的样品中含有超过 99%的非可利用（残留）分数。这些结果清楚地表明，即使是浓度最高的样品，钡的溶解度也很低，环境风险很低。
