title: (210)Pb content in natural gas pipeline residues ("black-powder") and its correlation with the chemical composition.
abstract: The present work was carried out to assess the (210)Pb content in "black-powder" found in pigging operations on gas pipelines in Brazil, in particular, on the Campos Basin gas pipeline. Additionally, the chemical composition of such deposits was determined and an eventual correlation with (210)Pb concentration evaluated. Typical "black-powder" generated in the natural gas pipeline from Campos Basin oilfield contains mainly iron oxide ( approximately 81%) and residual organic matter ( approximately 9%). The (210)Pb content ranges from 4.9 to 0.04k Bqkg(-1) and seems to be inversely correlated with the distance to the platforms. On the other hand, (226)Ra concentration is higher on the pipeline branch between the platform and the onshore installations. (228)Ra was only observed in few samples, in particular, in the samples with the highest (226)Ra content.
authors.affiliation: Instituto de Radioproteção e Dosimetria, Comissão Nacional de Energia Nuclear, Avenida Salvador Allende s/n, Recreio dos Bandeirantes, Rio de Janeiro, CEP 22780-160, RJ, Brazil. jmgodoy@ird.gov.br
authors.forename: José Marcus
authors.initials: JM
authors.lastname: Godoy
authors.forename: Franciane
authors.initials: F
authors.lastname: Carvalho
authors.forename: Aloisio
authors.initials: A
authors.lastname: Cordilha
authors.forename: Luiz Ernesto
authors.initials: LE
authors.lastname: Matta
authors.forename: Maria Luiza
authors.initials: ML
authors.lastname: Godoy
mesh_terms: D001938:Brazil; D004781:Environmental Exposure; D004868:Equipment Failure; D005290:Ferric Compounds / Q000032:analysis*; D005579:Fossil Fuels; D007856:Lead Radioisotopes / Q000032:analysis*; D009930:Organic Chemicals / Q000032:analysis; D011883:Radium / Q000032:analysis*; D014961:X-Ray Diffraction
chemical_list: D005290:Ferric Compounds; D005579:Fossil Fuels; D007856:Lead Radioisotopes; D009930:Organic Chemicals; C000499:ferric oxide; D011883:Radium