Radionuclides Quality Reference Values in Basalt derived Soils of Forest Conservation Areas
DOI:
https://doi.org/10.26848/rbgf.v18.2.p1564-1578Palavras-chave:
radionuclídeos, valores de Referência, solosResumo
Para explorar diferenças e semelhanças radioquímicas entre solos contaminados, intactos e perturbados, especialmente para a tomada de decisões e normas reguladoras, é importante estabelecer Valores de Referência de Qualidade (QRV) relacionados aos radionuclídeos naturais. Neste trabalho foram determinados os teores de 232Th, 238U e 40K e seus respectivos QRV para solos originados de litologia basáltica em uma área de aproximadamente 22.851 km² localizada no Estado do Paraná, Brasil. A amostragem compreendeu setenta e duas amostras de solo coletadas no horizonte A em Áreas de Preservação Ambiental, todas analisadas por espectrometria de raios gama em laboratório. Os resultados mostraram QRV total (incluindo todos os solos amostrados) para 232Th, 238U e 40K, no percentil 75, de 57,34 Bq.kg-1 (14,1 ppm de eTh), 36,63 Bq.kg-1 (3,0 ppm de eU) e 56,28 Bq.kg-1 (0,18% K). Observou-se tendência a maiores valores de 232Th e 238U, e menores valores de 40K, de acordo com a maturação do solo (Neossolo, Nitossolo, Latossolo). A mesma tendência é observada com o aumento do teor de argila. Essas nomeações foram particularmente aprovadas pela Análise de Componentes Principais (PCA). Os QRV também foram obtidos por classes de solos, o que ajuda a verificar suas diferenças nas concentrações para evitar conclusões errôneas relacionadas à possível contaminação de solos perturbados e fornecer subsídios para o estudo comparativo de solos com características semelhantes.
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