de Paula Filho Francisco José, Marins Rozane Valente, de Lacerda Luiz Drude, Aguiar José Edvar, Peres Tiago Farias
Universidade Federal do Piauí, Campus Prof(a) Cinobelina Elvas, Rod. BR 135, Km 03, s/n, Planalto Horizonte, 64.900-000 Bom Jesus, PI, Brazil.
Universidade Federal do Ceará, Instituto de Ciências do Mar/LABOMAR, Av. da Abolição, 3207, 60.165-081 Fortaleza, CE, Brazil.
Mar Pollut Bull. 2015 Feb 28;91(2):424-8. doi: 10.1016/j.marpolbul.2014.08.022. Epub 2014 Oct 3.
This study establishes regional background levels and upper thresholds (geochemical baseline) for Zn, Cu, Pb, Cr, Mn, and Fe from surface samples and profiles taken in 16 sedimentary environments of the Parnaíba River Delta estuary, NE-Brazil. Three approaches were applied to evaluate metal contamination: normalization to Fe, statistical analysis and sediment quality guidelines or environmental assessment criteria (TEL-PEL). Metal concentrations in sediments ranged from 2.4 to 31 mg Zn kg(-1), 1.5 to 48 mg Cu kg(-1), 1.3 to 28 mg Pb kg(-1), 1.5 to 38 mg Cr kg(-1); 145 to 1,356 mg Mn kg(-1), and 0.3% to 2.5% for Fe. All metals showed positive correlations with the <0.63 μm sediment fraction, indicating a significant association with rich lithogenic sources of iron oxide-hydroxides. Results suggest a low probability of adverse effects to the local aquatic biota. The background values of the area were lower than those reported for other areas of the northeastern coast of Brazil.
本研究确定了巴西东北部帕纳伊巴河三角洲河口16个沉积环境中表层样品和剖面中锌、铜、铅、铬、锰和铁的区域背景水平及上限阈值（地球化学基线）。采用了三种方法来评估金属污染：以铁为标准进行归一化、统计分析以及沉积物质量指南或环境评估标准（TEL-PEL）。沉积物中的金属浓度范围为：锌2.4至31毫克/千克，铜1.5至48毫克/千克，铅1.3至28毫克/千克，铬1.5至38毫克/千克，锰145至1356毫克/千克，铁0.3%至2.5%。所有金属与<0.63微米的沉积物部分均呈正相关，表明与富含铁氧化物-氢氧化物的成岩源有显著关联。结果表明对当地水生生物群产生不利影响的可能性较低。该区域的背景值低于巴西东北海岸其他区域所报告的值。
