RT info:eu-repo/semantics/bachelorThesis
T1 Fast and sensitive determination of lead and its isotopes in building materials by sector field inductively coupled plasma mass spectrometry
A1 Hoz Nieto, Ángela de la
A2 Universidad de Valladolid. Facultad de Ciencias
K1 ICP-MS
K1 Concrete
K1 Cement
K1 Lead
AB Concrete has been one of the most widely used construction materials since early civilizations,due to its low production cost and high mechanical strength. These materials have evolved sinceprehistoric times, with significant advancements during the ancient Roman Empire, thebeginning of the use of Portland cement, and the use of various types of aggregates. Thedisadvantage of Portland cement is the environmental impact it generates, due to the amount ofCO2 released during its production. This fact makes it a subject of ongoing study, exploringalternatives to reduce its carbon footprint while preserving its technical properties. One examplein this regard is expanded clays, which are artificial aggregates that provide certain physicalproperties to concrete and reduce its volume.On the other hand, the addition of lead oxides to concrete increases its density and compressivestrength, making it suitable for certain applications. Given the toxicity of lead, it is necessaryto understand its capacity for mobilization and release into the environment.The main objective of this study is to develop a method for determining lead in concrete andexpanded clay to elucidate the mobility of lead in these materials.For this purpose, the different reference materials were subjected to various treatments (water,HAcO, HNO3, aqua regia, total digestion with HF). Subsequently, the lead content and itsisotopic ratios were determined in the corresponding leachates, as they could be used asindicators of anthropogenic activities, using HR-ICP-MS. The detection limit is 0.2 pg/g, witha sensitivity of 1.5 Mcps/(ng/mL).The results obtained show partial mobility of Pb in hot water. On the other hand, acidictreatment, even weak, leads to its practically total dissolution, with recoveries greater than 95%for all materials analyzed. Regarding isotopic ratios, values of 208Pb/204Pb ranging from 36.08to 39.50, 206Pb/204Pb from 17.60 to 19.75, and 207Pb/204Pb from 14.84 to 15.97 were found,with deviations from reference materials of less than 5%.Quantification of the Pb content in these materials and its identification through isotopic ratioscan lead to determining its origin
YR 2024
FD 2024
LK https://uvadoc.uva.es/handle/10324/74611
UL https://uvadoc.uva.es/handle/10324/74611
LA spa
NO Departamento de Química Analítica
DS UVaDOC
RD 04-abr-2025