TY - JOUR
T1 - Trace elements from the Central Pacific Mexican Shelf
T2 - Geochemical associations and anthropogenic influences
AU - Marmolejo-Rodríguez, A. J.
AU - Morales-Blake, A. R.
AU - González-Chavarín, I.
AU - Hernández-Becerril, D.
AU - Alonso-Rodríguez, R.
AU - Rodríguez-Palacio, M. C.
AU - Sánchez-González, A.
AU - Magallanes-Ordóñez, V. R.
N1 - Publisher Copyright:
© 2016 Elsevier Ltd
PY - 2017/11/5
Y1 - 2017/11/5
N2 - Baselines for major and trace elements were determined from surface sediment samples from sites located along the Central Pacific Mexican Shelf (CPMS; 16.7–20.45° N). This study area is next to the biggest harbours in Mexico, for example touristic (Puerto Vallarta and Acapulco), touristic and industrial (Manzanillo), and industrial harbours (Lázaro Cárdenas). The industrial harbours have been expanding, transporting tonnes of materials to Asia and North and South America. Oceanographic campaigns were conducted to obtain sediment from depths ranging from 56 to 159 m. The grain size was predominately fine fraction (<63 μm; mean 56 μm ± 30%). More than 50 elements were analysed, and methods were validated with certified reference materials. The results extracted the iron ore signal; enrichment and the association between Fe and Co, Cr, Cu, Mg, Mn, Mo, Ni, V, and Zn were determined for the sediments. Arsenic is enriched in the CPMS; the Normalized Enrichment Factor average (NEFAV) for As is NEFAV = 8 ± 7. However the ratio between As and Cs indicates a natural origin in the most of the sites. Cadmium, Mo, and Ag were significantly correlated with Corg enhanced precipitation of sulfide-reactive metals. Moreover, an anthropogenic influence was detected for Hg (NEFAV = 4.3 ± 1.5) and Ag (NEFAV = 8.5 ± 2.6) in the shelf near the heavily industrialized harbour of Lázaro Cárdenas.
AB - Baselines for major and trace elements were determined from surface sediment samples from sites located along the Central Pacific Mexican Shelf (CPMS; 16.7–20.45° N). This study area is next to the biggest harbours in Mexico, for example touristic (Puerto Vallarta and Acapulco), touristic and industrial (Manzanillo), and industrial harbours (Lázaro Cárdenas). The industrial harbours have been expanding, transporting tonnes of materials to Asia and North and South America. Oceanographic campaigns were conducted to obtain sediment from depths ranging from 56 to 159 m. The grain size was predominately fine fraction (<63 μm; mean 56 μm ± 30%). More than 50 elements were analysed, and methods were validated with certified reference materials. The results extracted the iron ore signal; enrichment and the association between Fe and Co, Cr, Cu, Mg, Mn, Mo, Ni, V, and Zn were determined for the sediments. Arsenic is enriched in the CPMS; the Normalized Enrichment Factor average (NEFAV) for As is NEFAV = 8 ± 7. However the ratio between As and Cs indicates a natural origin in the most of the sites. Cadmium, Mo, and Ag were significantly correlated with Corg enhanced precipitation of sulfide-reactive metals. Moreover, an anthropogenic influence was detected for Hg (NEFAV = 4.3 ± 1.5) and Ag (NEFAV = 8.5 ± 2.6) in the shelf near the heavily industrialized harbour of Lázaro Cárdenas.
KW - Contamination
KW - Harbours
KW - Heavy metals
KW - Marine sediment
KW - Metalloids
UR - http://www.scopus.com/inward/record.url?scp=85009291211&partnerID=8YFLogxK
U2 - 10.1016/j.ecss.2016.12.006
DO - 10.1016/j.ecss.2016.12.006
M3 - Artículo
SN - 0272-7714
VL - 198
SP - 461
EP - 470
JO - Estuarine, Coastal and Shelf Science
JF - Estuarine, Coastal and Shelf Science
ER -