期刊名称：The Open Environmental Pollution & Toxicology Journal
电子版ISSN：1876-3979
出版年度：2012
卷号：3
期号：1
页码：47-54
DOI：10.2174/1876397901203010047
出版社：Bentham open
摘要：
A new simple and low-cost digestion method for sediment samples was studied and optimized. It was based on
the acid digestions of samples into low-pressure PTFE bombs and heating in a simple convection-based oven, as an
alternative to available standard methods based on high-pressure bombs and microwave ovens. Although there is no doubt
about the benefits of microwave-based methodologies, there is still a problem related with the high cost of the equipment
required, making difficult its practical application in some developing countries. The proposed methodology was
optimized by using three certified reference materials (CRMs): marine sediment (GBW07313), estuarine sediment
(SRM1646a) and river sediment (CRM320), which were digested separately by the two studied methods. Metal
concentrations in the digested extracts were analyzed and compared. Average metals recoveries obtained with the new
method ranged from 61 % (Al) to 100 % (Cd, Co, Pb), and, in general, significant differences between the two
methodologies were not observed.
The new digestion method was applied to the simultaneous determination of up to ten heavy metals in marine sediments
from the Northern Moroccan coastline, in the Mediterranean province of Tetouan and Chefchaouen. The results obtained
ranged from 1.26-3.32 % for Al, 16.2-20.7 mg/kg for Co, 49.7-72.7 mg/kg for Cr, 20.2-32.3 mg/kg for Cu, 2.98-3.92 %
for Fe, 184-394 for Mn, 34.5-44.3 mg/kg for Ni, 36.0-49.7 mg/kg for Pb, 0.46-0.55 % for Ti, and 67.5-83.6 mg/kg for Zn.
A statistical data analysis was performed in order to determine the sources of heavy metals in this area. Relatively high
concentrations of Cr, Ni and Pb were measured in all the sampling sites, although their anthropogenic origin could not be
established. In addition, Cu and organic matter were enriched in sediments close to agricultural areas.
